UNUM GROUP, 10-Q filed on 4/29/2026
Quarterly Report
v3.26.1
Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2026
Apr. 27, 2026
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Amendment Flag false  
Document Period End Date Mar. 31, 2026  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q1  
Document Transition Report false  
Entity File Number 001-11294  
Entity Registrant Name Unum Group  
Entity Central Index Key 0000005513  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 62-1598430  
Entity Address, Address Line One 1 Fountain Square  
Entity Address, City or Town Chattanooga,  
Entity Address, State or Province TN  
Entity Address, Postal Zip Code 37402  
City Area Code 423  
Local Phone Number 294-1011  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   159,776,235
NEW YORK STOCK EXCHANGE, INC. | Common Class A    
Entity Information [Line Items]    
Title of 12(b) Security Common stock, $0.10 par value  
Trading Symbol UNM  
Security Exchange Name NYSE  
NEW YORK STOCK EXCHANGE, INC. | 6.250% Junior Subordinated Notes due 2058    
Entity Information [Line Items]    
Title of 12(b) Security 6.250% Junior Subordinated Notes due 2058  
Trading Symbol UNMA  
Security Exchange Name NYSE  
v3.26.1
CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Investments    
Debt Securities, Available-for-Sale $ 33,300.8 $ 33,056.6
Mortgage Loans (net of allowance for credit losses of $15.3; $15.9) [1] 2,066.3 2,109.5
Policy Loans 3,702.9 3,668.1
Other Long-term Investments 1,664.8 1,670.4
Short-term Investments 2,055.3 3,016.2
Total Investments 42,790.1 43,520.8
Other Assets    
Cash and Bank Deposits 192.6 158.2
Accounts and Premiums Receivable (net of allowance for credit losses of $26.9; $26.1) 1,614.4 1,429.8
Reinsurance Recoverable (net of allowance for credit losses of $0.4; $1.4) 11,310.9 11,574.6
Accrued Investment Income 582.0 596.0
Deferred Acquisition Costs 2,974.4 2,920.3
Goodwill 353.0 353.9
Property and Equipment 509.3 503.7
Deferred Income Tax Assets, Net 37.2 79.5
Other Assets 2,350.4 2,382.6
Total Assets 62,714.3 63,519.4
Liabilities    
Future Policy Benefits 37,300.5 38,017.0
Policyholders' Account Balances 5,736.0 5,636.4
Unearned Premiums 509.1 412.8
Other Policyholders’ Funds 1,472.6 1,479.7
Income Tax Payable 87.6 52.2
Deferred Income Tax 41.0 38.8
Long-term Debt 3,762.0 3,767.6
Other Liabilities 2,913.1 2,995.8
Total Liabilities 51,821.9 52,400.3
Commitments and Contingent Liabilities - Note 13
Stockholders' Equity    
Common Stock, $0.10 par; authorized: 725,000,000 shares; issued: 195,954,270 and 195,460,723 shares 19.6 19.6
Additional Paid-in Capital 1,602.1 1,593.0
Accumulated Other Comprehensive Loss (1,795.5) (1,808.5)
Retained Earnings 13,498.9 13,345.3
Treasury Stock - at cost: 35,885,782 and 30,500,524 shares (2,432.7) (2,030.3)
Total Stockholders' Equity 10,892.4 11,119.1
Total Liabilities and Stockholders' Equity $ 62,714.3 $ 63,519.4
[1]
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
v3.26.1
CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Investments    
Amortized Cost of Fixed Maturity Securities $ 35,530.8 $ 34,747.2
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities 0.0 5.9
Financing Receivable, Allowance for Credit Losses, Mortgage Loans 15.3 15.9
Other Assets    
Premium Receivable, Allowance for Credit Loss 26.9 26.1
Reinsurance Recoverable, Allowance for Credit Loss $ 0.4 $ 1.4
Stockholders' Equity, Number of Shares, Par Value and Other Disclosure [Abstract]    
Common Stock, Par Value (in dollars per share) $ 0.10 $ 0.10
Common Stock, Shares Authorized 725,000,000 725,000,000
Common Stock, Shares Issued 196,635,349 196,194,941
Treasury Stock, Shares at Cost 35,885,782 30,500,524
v3.26.1
CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Revenue    
Premium Income $ 2,794.0 $ 2,702.9
Net Investment Income 483.4 513.2
Net Investment Loss (5.0) (206.8)
Other Income 82.8 82.3
Total Revenue 3,355.2 3,091.6
Benefits and Expenses    
Benefits and Change in Reserves for Future Benefits 1,955.8 1,960.3
Policy Benefits - Remeasurement Loss (Gain) 48.2 (89.3)
Commissions 368.5 343.2
Interest and Debt Expense 53.1 52.0
Deferral of Acquisition Costs (190.6) (172.6)
Amortization of Deferred Acquisition Costs 134.2 125.4
Compensation Expense 325.5 310.4
Other Expenses 357.8 318.6
Total Benefits and Expenses 3,052.5 2,848.0
Income Before Income Tax 302.7 243.6
Income Tax Expense (Benefit)    
Current 37.8 80.4
Deferred 32.9 (25.9)
Total Income Tax Expense 70.7 54.5
Net Income $ 232.0 $ 189.1
Net Income Per Common Share    
Basic $ 1.41 $ 1.06
Assuming Dilution $ 1.41 $ 1.06
v3.26.1
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Statement of Comprehensive Income [Abstract]    
Net Income $ 232.0 $ 189.1
Other Comprehensive Income (Loss)    
Change in Net Unrealized Loss on Securities (net of tax expense (benefit) of $(116.1); $110.2) (429.2) 422.0
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance (net of tax expense (benefit) of $125.9; $(42.6)) 465.2 (166.3)
Change in Net Loss on Derivatives (net of tax expense (benefit) of $(1.0); $11.7) (3.3) 45.5
Change in Foreign Currency Translation Adjustment (net of tax expense (benefit) of $0.1; $(0.2)) (23.0) 42.3
Change in Unrecognized Pension and Postretirement Benefit Costs (net of tax expense (benefit) of $1.0; $(0.2)) (3.3) (1.4)
Total Other Comprehensive Income 13.0 344.9
Comprehensive Income $ 245.0 $ 534.0
v3.26.1
CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Statement of Comprehensive Income [Abstract]    
Change in Net Unrealized Gain on Securities Before Adjustment, Tax expense (benefit) $ (116.1) $ 110.2
Change in the Effect of Discount Rate ASsumptions on the LIability for Future Policy Benefits, Net of Reinsurance net of tax expense (benefit) 125.9 (42.6)
Change in Net Loss on Derivatives, tax expense (benefit) (1.0) 11.7
Change in Foreign Currency Translation Adjustment, tax expense (benefit) 0.1 (0.2)
Change in Unrecognized Pension and Postretirement Benefit Costs, tax expense (benefit) $ 1.0 $ (0.2)
v3.26.1
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Treasury Stock, Common
Balance at Beginning of Year at Dec. 31, 2024   $ 19.5 $ 1,489.6 $ (2,523.7) $ 12,914.0 $ (938.3)
Increase (Decrease) in Stockholders' Equity            
Common Stock Activity     (1.2)      
Cost of Shares Repurchased $ (202.6) [1]   (80.3)     (282.9)
Other Comprehensive Income 344.9     344.9    
Net Income 189.1       189.1  
Dividends to Stockholders (per common share: $0.46; $0.42)         (77.3)  
Balance at End of Year at Mar. 31, 2025 11,214.0   1,568.7 (2,178.8) 13,025.8 (1,221.2)
Balance at End of Year at Dec. 31, 2025 11,119.1 $ 19.6 1,593.0 (1,808.5) 13,345.3 (2,030.3)
Increase (Decrease) in Stockholders' Equity            
Common Stock Activity     9.1      
Cost of Shares Repurchased (402.4) [1]   0.0     (402.4)
Other Comprehensive Income 13.0     13.0    
Net Income 232.0       232.0  
Dividends to Stockholders (per common share: $0.46; $0.42)         (78.4)  
Balance at End of Year at Mar. 31, 2026 $ 10,892.4   $ 1,602.1 $ (1,795.5) $ 13,498.9 $ (2,432.7)
[1]
2Includes $0.1 million and $0.5 million of commissions for the three months ended March 31, 2026 and 2025, respectively. Also includes $3.7 million and $2.1 million of excise taxes for the three months ended March 31, 2026 and 2025, respectively.
v3.26.1
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Statement of Stockholders' Equity [Abstract]    
Common Stock, Dividends, Per Share, Cash Paid $ 0.46 $ 0.42
v3.26.1
CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Cash Flows from Operating Activities      
Net Income $ 232.0 $ 189.1  
Adjustments to Reconcile Net Income to Net Cash Provided (Used) by Operating Activities      
Change in Receivables (33.8) 202.4  
Change in Deferred Acquisition Costs (56.4) (47.2)  
Change in Insurance Reserves and Liabilities 143.5 (59.6)  
Change in Income Taxes 71.2 53.3  
Change in Other Accrued Liabilities (69.3) (203.5)  
Non-cash Components of Net Investment Income (36.1) (18.3)  
Net Investment Loss 5.0 206.8  
Depreciation 31.8 30.0  
Amortization of the Cost of Reinsurance 45.7 9.6  
Other, Net 7.2 (9.0)  
Net Cash Provided (Used) by Operating Activities 340.8 353.6  
Cash Flows from Investing Activities      
Proceeds from Sales of Fixed Maturity Securities 45.7 255.4  
Proceeds from Maturities of Fixed Maturity Securities 648.0 467.0  
Proceeds from Sales and Maturities of Other Investments 140.6 131.8  
Purchases of Fixed Maturity Securities (1,543.0) (416.8)  
Purchases of Other Investments (88.7) (98.8)  
Net Sales and Maturities (Purchases) of Short-term Investments 979.1 (391.4)  
Net Increase (Decrease) in Payables for Collateral on Investments (59.4) 76.5  
Net Purchases of Property and Equipment (39.6) (35.8)  
Net Cash Provided (Used) by Investing Activities 82.7 (12.1)  
Cash Flows from Financing Activities      
Repayments of Long-term Debt 7.2 0.0  
Issuance of Common Stock 1.6 1.4  
Repurchase of Common Stock (398.8) (200.5)  
Dividends Paid to Stockholders (78.2) (77.1)  
Proceeds from Policyholder Account Deposits 153.8 32.3  
Payments for Policyholder Account Withdrawals (43.0) (22.7)  
Other, Net (17.3) 0.0  
Net Cash Used by Financing Activities (389.1) (266.6)  
Net Increase in Cash and Bank Deposits 34.4 74.9  
Cash and Bank Deposits at Beginning of Year 158.2 162.8 $ 162.8
Cash and Bank Deposits at End of Period $ 192.6 $ 237.7 $ 158.2
v3.26.1
Basis of Presentation
 3 Months Ended
Mar. 31, 2026
Accounting Policies [Abstract]  
Basis of Presentation
The accompanying consolidated financial statements of Unum Group and its subsidiaries (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes included in our annual report on Form 10-K for the year ended December 31, 2025.

In our opinion, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. Interim results are not necessarily indicative of full year performance.
v3.26.1
Accounting Developments
 3 Months Ended
Mar. 31, 2026
Accounting Developments and New Accounting Policies [Abstract]  
Accounting Developments
Note 2 - Accounting Developments

Accounting Updates Adopted in 2025:

ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures

The amendments in this update required greater disaggregation of income tax disclosures related to the income tax rate reconciliation and income taxes paid. Specifically, the guidance required additional information that met a quantitative threshold in specified categories with respect to the reconciliation of the effective tax rate to the statutory tax rate for federal, state, and foreign income taxes. The specified categories were the following: state and local income taxes, foreign tax effects, effect of cross-border tax laws, enactment of new tax laws, nontaxable or nondeductible items, tax credits, changes in valuation allowances, and changes in unrecognized tax benefits. The quantitative threshold for each category is five percent of the amount computed by multiplying income (or loss) from continuing operations before income taxes by the statutory federal income tax rate. In addition, the amendments required additional information pertaining to income taxes paid, net of refunds, to be disaggregated by federal, state and foreign jurisdictions, and further disaggregated for specific jurisdictions to the extent the related amounts exceeded a quantitative threshold of five percent of total income taxes paid. The amendments also required disclosures of income (or loss) before income tax expense (or benefit) as domestic or foreign for each annual reporting period.

The amendments eliminated the historic requirement to disclose information regarding unrecognized tax benefits having a reasonable possibility of significantly increasing or decreasing in the twelve months following the reporting date, as well as the requirement to disclose the cumulative temporary differences when a deferred tax liability was not recognized due to certain exceptions under ASC 740.

The amendments in this update were applied retrospectively in the annual period ended as of December 31, 2025. The adoption of this update modified our disclosures, but did not have an impact on our financial position or results of operations.

Accounting Updates Outstanding:

ASU 2024-03, Disaggregation of Income Statement Expenses: Income Statement - Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses and related amendment

The amendments in this update require the disclosure of disaggregation of certain income statement expense line items. Specifically, the guidance requires the disclosure of additional information related to certain expenses, including employee compensation, depreciation and amortization, and certain other expenses included in each income statement line item. The amendments also require the disclosure of both the total amount of selling expenses and a definition of selling expenses.

We will adopt this update effective for the annual period beginning January 1, 2027, and interim periods beginning January 1, 2028. The adoption of this update is permitted on a prospective basis or a retrospective basis. The adoption of this update will expand our disclosures, but will not have an impact on our financial position or results of operations.
ASU 2025-06, Targeted Improvements to the Accounting for Internal-Use Software: Intangibles - Goodwill and Other-Internal-Use Software (Subtopic 350-40)

The amendments in this update modernize the recognition framework for the capitalization of internal-use software and remove all references to software development project stages. The guidance requires software development costs to be capitalized when both of the following criteria are met: (i) management has authorized and committed to funding the project, and (ii) it is probable that the project will be completed and the software will be used to perform its intended function. Additionally, the update aligns disclosure requirements for capitalized software costs with those under ASC 360-10, Property, Plant, and Equipment.

We will adopt this update effective for the interim and annual periods beginning January 1, 2028. The adoption of this update is permitted on a prospective, retrospective, or modified retrospective basis. We are currently evaluating the impact the adoption of this update will have on our financial position, results of operations, and disclosures.
v3.26.1
Fair Values of Financial Instruments
 3 Months Ended
Mar. 31, 2026
Fair Value Disclosures [Abstract]  
Fair Values of Financial Instruments
Note 3 - Fair Value of Financial Instruments

Fair Value Measurements for Financial Instruments Carried at Fair Value

We report fixed maturity securities, which are classified as available-for-sale securities, derivative financial instruments, and unrestricted equity securities at fair value in our consolidated balance sheets. We report our investments in private equity partnerships at our share of the partnerships' net asset value (NAV) per share or its equivalent as a practical expedient for fair value.

The degree of judgment utilized in measuring the fair value of financial instruments generally correlates to the level of pricing observability. Financial instruments with readily available active quoted prices or for which fair value can be measured from actively quoted prices in active markets generally have more pricing observability and less judgment utilized in measuring fair value. An active market for a financial instrument is a market in which transactions for an asset or a similar asset occur with sufficient frequency and volume to provide pricing information on an ongoing basis. A quoted price in an active market provides the most reliable evidence of fair value and should be used to measure fair value whenever available. Conversely, financial instruments rarely traded or not quoted have less observability and are measured at fair value using valuation techniques that require more judgment. Pricing observability is generally impacted by a number of factors, including the type of financial instrument, whether the financial instrument is new to the market and not yet established, the characteristics specific to the transaction, and overall market conditions.

We classify financial instruments in accordance with a fair value hierarchy consisting of three levels based on the observability of valuation inputs:

•Level 1 - the highest category of the fair value hierarchy classification wherein inputs are unadjusted and represent quoted prices in active markets for identical assets or liabilities at the measurement date.

•Level 2 - valued using inputs (other than prices included in Level 1) that are either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument's anticipated life.

•Level 3 - the lowest category of the fair value hierarchy and reflects the judgment of management regarding what market participants would use in pricing assets or liabilities at the measurement date. Financial assets and liabilities categorized as Level 3 are generally those that are valued using unobservable inputs to extrapolate an estimated fair value.

Valuation Methodologies of Financial Instruments Measured at Fair Value

Valuation techniques used for assets and liabilities accounted for at fair value are generally categorized into three types. The market approach uses prices and other relevant information from market transactions involving identical or comparable assets
or liabilities. The income approach converts future amounts, such as cash flows or earnings, to a single present amount, or a discounted amount. The cost approach is based upon the amount that currently would be required to replace the service capacity of an asset, or the current replacement cost.

We use valuation techniques that are appropriate in the circumstances and for which sufficient data are available that can be obtained without undue cost and effort. In some cases, a single valuation technique will be appropriate (for example, when valuing an asset or liability using quoted prices in an active market for identical assets or liabilities). In other cases, multiple valuation techniques will be appropriate. If we use multiple valuation techniques to measure fair value, we evaluate and weigh the results, as appropriate, considering the reasonableness of the range indicated by those results. A fair value measurement is the point within that range that is most representative of fair value in the circumstances.

The selection of the valuation method(s) to apply considers the definition of an exit price and depends on the nature of the asset or liability being valued. For assets and liabilities accounted for at fair value, we generally use valuation techniques consistent with the market approach, and to a lesser extent, the income approach. We believe the market approach provides more observable data than the income approach, considering the type of investments we hold. Our fair value measurements could differ significantly based on the valuation technique and available inputs. When using a pricing service, we obtain the vendor's pricing documentation to ensure we understand their methodologies. We periodically review and approve the selection of our pricing vendors to ensure we are in agreement with their current methodologies. When markets are less active, brokers may rely more on models with inputs based on the information available only to the broker. Our internal investment management professionals, which include portfolio managers and analysts, monitor securities priced by brokers and evaluate their prices for reasonableness based on benchmarking to available primary and secondary market information. In weighing a broker quote as an input to fair value, we place less reliance on quotes that do not reflect the result of market transactions. We also consider the nature of the quote, particularly whether it is a bid or market quote. If prices in an inactive market do not reflect current prices for the same or similar assets, adjustments may be necessary to arrive at fair value. When relevant market data is unavailable, which may be the case during periods of market uncertainty, the income approach can, in suitable circumstances, provide a more appropriate fair value. During 2026, we have applied valuation approaches and techniques on a consistent basis to similar assets and liabilities and consistent with those approaches and techniques used at year end 2025.

Fixed Maturity and Equity Securities

We use observable and unobservable inputs in measuring the fair value of our fixed maturity and equity securities. For securities categorized as Level 1, fair values equal active Trade Reporting and Compliance Engine (TRACE) pricing or unadjusted market maker prices. For securities categorized as Level 2 or Level 3, inputs that may be used in valuing each class of securities at any given time period are disclosed below. Actual inputs used to determine fair values will vary for each reporting period depending on the availability of inputs which may, at times, be affected by the lack of market liquidity.
Level 2Level 3
InstrumentObservable InputsUnobservable Inputs
United States Government and Government Agencies and Authorities
Valuation MethodPrincipally the market approachNot applicable
Valuation Techniques / InputsPrices obtained from external pricing services
States, Municipalities, and Political Subdivisions
Valuation MethodPrincipally the market approachPrincipally the market approach
Valuation Techniques / InputsPrices obtained from external pricing servicesAnalysis of similar bonds, adjusted for comparability
Relevant reports issued by analysts and rating agencies
Audited financial statements
Level 2Level 3
InstrumentObservable InputsUnobservable Inputs
Foreign Governments
Valuation MethodPrincipally the market approachPrincipally the market approach
Valuation Techniques / InputsPrices obtained from external pricing servicesAnalysis of similar bonds, adjusted for comparability
Non-binding broker quotes
Call provisions
Public Utilities
Valuation MethodPrincipally the market and income approachesPrincipally the market and income approaches
Valuation Techniques / InputsPrices obtained from external pricing servicesChange in benchmark reference
Non-binding broker quotesAnalysis of similar bonds, adjusted for comparability
Benchmark yieldsDiscount for size - illiquidity
Transactional data for new issuances and secondary tradesVolatility of credit
Security cash flows and structuresLack of marketability
Recent issuance / supply
Audited financial statements
Security and issuer level spreads
Security creditor ratings/maturity/capital structure/optionality
Public covenants
Comparative bond analysis
Relevant reports issued by analysts and rating agencies
Level 2Level 3
InstrumentObservable InputsUnobservable Inputs
Mortgage/Asset-Backed Securities1
Valuation MethodPrincipally the market and income approachesPrincipally the market approach
Valuation Techniques / InputsPrices obtained from external pricing servicesAnalysis of similar bonds, adjusted for comparability
Non-binding broker quotesPrices obtained from external pricing services
Security cash flows and structures
Underlying collateral
Prepayment speeds/loan performance/delinquencies
Relevant reports issued by analysts and rating agencies
Audited financial statements
All Other Corporate Bonds
Valuation MethodPrincipally the market and income approachesPrincipally the market and income approaches
Valuation Techniques / InputsPrices obtained from external pricing servicesChange in benchmark reference
Non-binding broker quotesDiscount for size - illiquidity
Benchmark yieldsVolatility of credit
Transactional data for new issuances and secondary tradesLack of marketability
Security cash flows and structuresPrices obtained from external pricing services
Recent issuance / supply
Security and issuer level spreads
Security creditor ratings/maturity/capital structure/optionality
Public covenants
Comparative bond analysis
Relevant reports issued by analysts and rating agencies
Audited financial statements
Level 2Level 3
InstrumentObservable InputsUnobservable Inputs
Redeemable Preferred Stocks
Valuation MethodPrincipally the market approachPrincipally the market approach
Valuation Techniques / InputsNon-binding broker quotesFinancial statement analysis
Benchmark yields
Comparative bond analysis
Call provisions
Relevant reports issued by analysts and rating agencies
Audited financial statements
Perpetual Preferred and Equity Securities
Valuation MethodPrincipally the market approachPrincipally the market and income approaches
Valuation Techniques / InputsPrices obtained from external pricing servicesFinancial statement analysis
Non-binding broker quotes

1Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types.

The management of our investment portfolio includes establishing pricing policy and reviewing the reasonableness of sources and inputs used in developing pricing. We review all prices that vary between multiple pricing vendors by a threshold that is outside a normal market range for the asset type.  In the event we receive a vendor's market price that does not appear reasonable based on our market analysis, we may challenge the price and request further information about the assumptions and methodologies used by the vendor to price the security. We may change the selected price based on a better data source such as an actual trade. We also review all prices that did not change from the prior month to ensure that these prices are within our expectations. The overall valuation process for determining fair values may include adjustments to valuations obtained from our pricing sources when they do not represent a valid exit price. These adjustments may be made when, in our judgment and considering our knowledge of the financial conditions and industry in which the issuer operates, certain features of the financial instrument require that an adjustment be made to the value originally obtained from our pricing sources. These features may include the complexity of the financial instrument, the market in which the financial instrument is traded, counterparty credit risk, credit structure, concentration, or liquidity. Additionally, an adjustment to the price derived from a model typically reflects our judgment of the inputs that other participants in the market for the financial instrument being measured at fair value would consider in pricing that same financial instrument. In the event an asset is sold, we test the validity of the fair value determined by our valuation techniques by comparing the selling price to the fair value determined for the asset in the immediately preceding month end reporting period.

Certain of our investments do not have readily determinable market prices and/or observable inputs or may at times be affected by the lack of market liquidity. For these securities, we use internally prepared valuations, including valuations based on estimates of future profitability, to estimate the fair value. Additionally, we may obtain prices from independent third-party brokers to aid in establishing valuations for certain of these securities. Key assumptions used by us to determine fair value for these securities include risk free interest rates, risk premiums, performance of underlying collateral (if any), and other factors involving significant assumptions which may or may not reflect those of an active market.

The parameters and inputs used to validate a price on a security may be adjusted for assumptions about risk and current market conditions on a quarter to quarter basis, as certain features may be more significant drivers of valuation at the time of pricing.
Changes to inputs in valuations are not changes to valuation methodologies; rather, the inputs are modified to reflect direct or indirect impacts on asset classes from changes in market conditions.

At March 31, 2026, approximately 23.8 percent of our fixed maturity securities were valued using active trades from TRACE pricing or market maker prices for which there was current market activity in that specific security (comparable to receiving one binding quote).  The prices obtained were not adjusted, and the assets were classified as Level 1.

The remaining 76.2 percent of our fixed maturity securities were valued based on non-binding quotes or other observable and unobservable inputs, as discussed below:

•57.5 percent of our fixed maturity securities were valued based on prices from pricing services that generally use observable inputs such as prices for securities or comparable securities in active markets in their valuation techniques. These assets were classified as Level 2. 

•17.5 percent of our fixed maturity securities were valued based on one or more non-binding broker quotes, if validated by observable market data. When only one price is available, it is used if observable inputs and analysis confirms that it is appropriate. These assets, for which we were able to validate the price using other observable market data, were classified as Level 2.

•1.2 percent of our fixed maturity securities were valued based on prices of comparable securities, internal models, or pricing services or other non-binding quotes with no other observable market data. These assets were classified as either Level 2 or Level 3, with the categorization dependent on whether there was other observable market data.

Derivatives

Fair values for derivatives other than embedded derivatives in modified coinsurance arrangements are based on market quotes or pricing models and represent the net amount of cash we would have paid or received if the contracts had been settled or closed as of the last day of the period. Credit risk related to the counterparty and the Company is considered in determining the fair values of these derivatives. However, since we have collateralization agreements in place with each counterparty which limits our exposure, any credit risk is immaterial. Therefore, we determined that no adjustments for credit risk were required as of March 31, 2026 or December 31, 2025.

Fair values for our embedded derivative in a modified coinsurance arrangement are estimated using internal pricing models and represent the hypothetical value of the duration mismatch of assets and liabilities, interest rate risk, and third party credit risk embedded in the modified coinsurance arrangement.

We consider transactions in inactive markets to be less representative of fair value. We use all available observable inputs when measuring fair value, but when significant unobservable inputs are used, we classify these assets or liabilities as Level 3.

Private Equity Partnerships

Our private equity partnerships represent funds that are primarily invested in private credit, private equity, and real assets, as described below. Distributions received from the funds arise from income generated by the underlying investments as well as the liquidation of the underlying investments. There is generally not a public market for these investments.
The following tables present additional information about our private equity partnerships, including commitments for additional investments which may or may not be funded:

March 31, 2026
Investment CategoryFair ValueRedemption Term / Redemption NoticeUnfunded Commitments
(in millions of dollars)(in millions of dollars)
Private Credit(a)$181.7 Not redeemable$106.3 
49.5 Quarterly / 90 days notice12.7 
Total Private Credit231.2 119.0 
Private Equity(b)625.6 Not redeemable428.4 
33.1 Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice20.4 
Total Private Equity658.7 448.8 
Real Assets(c)515.9 Not redeemable266.7 
38.3 Quarterly / 90 days notice— 
Total Real Assets554.2 266.7 
Total Partnerships$1,444.1 $834.5 

December 31, 2025
Investment CategoryFair ValueRedemption Term / Redemption NoticeUnfunded Commitments
(in millions of dollars)(in millions of dollars)
Private Credit(a)$205.9 Not redeemable$108.3 
49.9 Quarterly / 90 days notice12.7 
Total Private Credit255.8 121.0 
Private Equity(b)618.9 Not redeemable406.8 
32.5 Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice15.5
Total Private Equity651.4 422.3 
Real Assets(c)511.4 Not redeemable213.4 
37.7 Quarterly / 90 days notice— 
Total Real Assets549.1 213.4 
Total Partnerships$1,456.3 $756.7 
(a)Private Credit - The limited partnerships described in this category employ various investment strategies, generally providing direct lending or other forms of debt financing including first-lien, second-lien, mezzanine, and subordinated loans. The limited partnerships have credit exposure to corporates, physical assets, and/or financial assets within a variety of industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail) in North America and, to a lesser extent, outside of North America.  As of March 31, 2026, the estimated remaining life of the investments that do not allow for redemptions is approximately 75 percent in the next 3 years, 7 percent during the period from 3 to 5 years, and 18 percent during the period from 5 to 10 years.

(b)Private Equity - The limited partnerships described in this category employ various strategies generally investing in controlling or minority control equity positions directly in companies and/or assets across various industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail), primarily in private markets within North America and, to a lesser extent, outside of North America.  As of March 31, 2026, the estimated remaining life of the investments that do not allow for redemptions is approximately 44 percent in the next 3 years, 19 percent during the period from 3 to 5 years, 36 percent during the period from 5 to 10 years, and 1 percent during the period from 10 to 15 years.

(c)Real Assets - The limited partnerships described in this category employ various strategies, which include investing in the equity and/or debt financing of physical assets, including infrastructure (energy, power, water/wastewater, communications), transportation (including airports, ports, toll roads, aircraft, railcars) and real estate in North America, Europe, South America, and Asia.  As of March 31, 2026, the estimated remaining life of the investments that do not allow for redemptions is approximately 54 percent in the next 3 years, 23 percent during the period from 3 to 5 years, and 23 percent during the period from 5 to 10 years.

We record changes in our share of NAV of the partnerships in net investment income. We receive financial information related to our investments in partnerships and generally record investment income on a one-quarter lag in accordance with our accounting policy. Our partnerships are subject to transfer restrictions which extend over the life of the investment. There are no circumstances in which the transfer restrictions would lapse.
The following tables present information about financial instruments measured at fair value on a recurring basis by fair value level, based on the observability of the inputs used:

 March 31, 2026
 Level 1Level 2Level 3NAVTotal
(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities$77.7 $467.2 $— $— $544.9 
States, Municipalities, and Political Subdivisions— 3,000.0 — — 3,000.0 
Foreign Governments— 844.9 — — 844.9 
Public Utilities690.3 4,315.1 — — 5,005.4 
Mortgage/Asset-Backed Securities1
— 1,159.2 197.7 — 1,356.9 
All Other Corporate Bonds7,152.4 15,328.1 60.4 — 22,540.9 
Redeemable Preferred Stocks— 7.8 — — 7.8 
Total Fixed Maturity Securities7,920.4 25,122.3 258.1 — 33,300.8 
Other Long-term Investments
Derivatives
Forwards— 1.7 — — 1.7 
Foreign Currency Interest Rate Swaps
— 59.0 — — 59.0 
Embedded Derivative in Modified Coinsurance Arrangement— — 14.8 — 14.8 
Total Derivatives— 60.7 14.8 — 75.5 
Perpetual Preferred and Equity Securities— 0.2 19.8 — 20.0 
Private Equity Partnerships— — — 1,444.1 1,444.1 
Total Other Long-term Investments— 60.9 34.6 1,444.1 1,539.6 
Total Financial Instrument Assets Carried at Fair Value$7,920.4 $25,183.2 $292.7 $1,444.1 $34,840.4 
Liabilities
Other Liabilities
Derivatives
Forwards$— $219.4 $— $— $219.4 
Foreign Currency Interest Rate Swaps— 41.6 — — 41.6 
Total Derivatives— 261.0 — — 261.0 
Total Financial Instrument Liabilities Carried at Fair Value$— $261.0 $— $— $261.0 
1Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types.
 December 31, 2025
 Level 1Level 2Level 3NAVTotal
(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities$79.3 $465.7 $— $— $545.0 
States, Municipalities, and Political Subdivisions— 3,058.1 — — 3,058.1 
Foreign Governments— 870.3 — — 870.3 
Public Utilities223.7 4,710.2 — — 4,933.9 
Mortgage/Asset-Backed Securities1
— 1,076.2 103.1 — 1,179.3 
All Other Corporate Bonds3,656.0 18,742.2 63.9 — 22,462.1 
Redeemable Preferred Stocks— 7.9 — — 7.9 
Total Fixed Maturity Securities3,959.0 28,930.6 167.0 — 33,056.6 
Other Long-term Investments
Derivatives
Forwards— 2.4 — — 2.4 
Foreign Currency Interest Rate Swaps
— 49.5 — — 49.5 
Embedded Derivative in Modified Coinsurance Arrangement— — 17.8 — 17.8 
Total Derivatives— 51.9 17.8 — 69.7 
Perpetual Preferred and Equity Securities— 0.2 19.8 — 20.0 
Private Equity Partnerships— — — 1,456.3 1,456.3 
Total Other Long-term Investments— 52.1 37.6 1,456.3 1,546.0 
Total Financial Instrument Assets Carried at Fair Value$3,959.0 $28,982.7 $204.6 $1,456.3 $34,602.6 
Liabilities
Other Liabilities
Derivatives
Forwards$— $223.9 $— $— $223.9 
Foreign Currency Interest Rate Swaps— 45.8 — — 45.8 
Total Derivatives— 269.7 — — 269.7 
Total Financial Instrument Liabilities Carried at Fair Value$— $269.7 $— $— $269.7 
1Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types.
Changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are as follows:

 Three Months Ended March 31, 2026
 Fair Value Beginning of YearTotal Realized
and Unrealized
Investment Gains (Losses) in		 Sales/MaturitiesLevel 3 TransfersFair Value End of PeriodChange in Unrealized Gain (Loss) on Securities Held at the End of Period included in
 EarningsOCIPurchasesIntoOut ofOCIEarnings
(in millions of dollars)
Fixed Maturity Securities
Public Utilities$— $— $— $— $(10.0)$10.0 $— $— $— $— 
Mortgage/Asset-Backed Securities1
103.1 — 0.6 103.4 (9.5)0.1 — 197.7 0.7 — 
All Other Corporate Bonds63.9 — 0.1 — (39.0)82.8 (47.4)60.4 (0.4)— 
Total Fixed Maturity Securities167.0 — 0.7 103.4 (58.5)92.9 (47.4)258.1 0.3 — 
Perpetual Preferred and Equity Securities19.8 — — — — — — 19.8 — — 
Embedded Derivative in Modified Coinsurance Arrangement17.8 (3.0)— — — — — 14.8 — (3.0)
1Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types.
 Three Months Ended March 31, 2025
Fair Value Beginning of YearTotal Realized
and Unrealized
Investment Gains (Losses) in		Sales/MaturitiesLevel 3 TransfersFair Value End of PeriodChange in Unrealized Gain (Loss) on Securities Held at the End of Period included in
EarningsOCIPurchasesIntoOut ofOCIEarnings
(in millions of dollars)
Fixed Maturity Securities
Public Utilities$— $(1.5)$1.6 $— $(12.3)$12.2 $— $— $— $— 
Mortgage/Asset-Backed Securities1
73.5 — (0.6)4.8 (0.5)— — 77.2 (0.6)— 
All Other Corporate Bonds71.5 (6.2)(8.3)— (70.3)83.8 (38.2)32.3 (8.3)— 
Total Fixed Maturity Securities145.0 (7.7)(7.3)4.8 (83.1)96.0 (38.2)109.5 (8.9)— 
Perpetual Preferred and Equity Securities24.4 0.7 — 1.7 — — — 26.8 — 0.7 
Embedded Derivative in Modified Coinsurance Arrangement11.5 (1.9)— — — — — 9.6 — (1.9)
1Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types.

Realized and unrealized investment gains and losses presented in the preceding tables represent gains and losses only for the time during which the applicable financial instruments were classified as Level 3. The transfers between levels resulted primarily from a change in observability of three inputs used to determine fair values of the securities transferred: (1) transactional data for new issuance and secondary trades, (2) broker/dealer quotes and pricing, primarily related to changes in the level of activity in the market and whether the market was considered orderly, and (3) comparable bond metrics from which to perform an analysis. For fair value measurements of financial instruments that were transferred either into or out of Level 3, we reflect the transfers using the fair value at the beginning of the period. We believe this allows for greater transparency, as all changes in fair value that arise during the reporting period of the transfer are disclosed as a component of our Level 3 reconciliation.
The table below provides quantitative information regarding the significant unobservable inputs used in Level 3 fair value measurements derived from internal models. Unobservable inputs for fixed maturity securities are weighted by the fair value of the securities. Certain securities classified as Level 3 are excluded from the table below due to limitations in our ability to obtain the underlying inputs used by external pricing sources.

March 31, 2026
Fair ValueValuation MethodUnobservable InputRange/Weighted Average
(in millions of dollars)
Fixed Maturity Securities
All Other Corporate Bonds - Private$5.7 Market Approach
Market Convention
(a)
Priced at Par Value
Perpetual Preferred and Equity Securities19.8 Market Approach
Market Convention
(a)Priced at Cost, Owner's Equity, or Most Recent Round
Embedded Derivative in Modified Coinsurance Arrangement14.8 Discounted Cash Flows
Projected Liability Cash Flows
Weighted Spread of Swap Curve
(b)
Actuarial Assumptions
(0.34)%

December 31, 2025
Fair ValueValuation MethodUnobservable InputRange/Weighted Average
(in millions of dollars)
Fixed Maturity Securities
All Other Corporate Bonds - Private$8.3 Market Approach
Market Convention
(a)
Priced at Par Value
Perpetual Preferred and Equity Securities19.8 Market ApproachMarket Convention(a)Priced at Cost, Owner's Equity, or Most Recent Round
Embedded Derivative in Modified Coinsurance Arrangement17.8 Discounted Cash Flows
Projected Liability Cash Flows
Weighted Spread of Swap Curve
(b)
Actuarial Assumptions
(0.41)%

(a)Represents a decision to price based on par value, cost, owner's equity, or the price of the most recent capital funding round when limited data is available
(b)Represents various actuarial assumptions required to derive the liability cash flows. Fair value of embedded derivative is most often driven by the change in the weighted average credit spread to the swap curve for the assets backing the hypothetical loan

Other than market convention, the impact of isolated decreases in unobservable inputs will result in a higher estimated fair value, whereas isolated increases in unobservable inputs will result in a lower estimated fair value. The unobservable input for market convention is not sensitive to input movements. The projected liability cash flows used in the fair value measurement of our Level 3 embedded derivative are based on expected claim payments. If claim payments increase, the projected liability cash flows will increase, resulting in a decrease in the fair value of the embedded derivative. Decreases in projected liability cash flows will result in an increase in the fair value of the embedded derivative.
Fair Value Measurements for Financial Instruments Not Carried at Fair Value

The methods and assumptions used to estimate fair values of financial instruments not carried at fair value are discussed as follows:

Mortgage Loans: Fair value of newly originated, seasoned performing, or sub-performing but likely to continue cash flowing loans are calculated using a discounted cash flow analysis. Loans’ cash flows are modeled and appropriately discounted by a rate based on current yields and credit spreads. For sub and non-performing loans where there is some probability the loan will not continue to pay, a price based approach would be used to estimate the loan’s value in the open market utilizing current transaction information from similar loans.

Policy Loans: Fair values for policy loans, net of reinsurance ceded, are estimated using discounted cash flow analyses and interest rates currently being offered to policyholders with similar policies. Carrying amounts for ceded policy loans, which equal $3,384.7 million and $3,353.8 million as of March 31, 2026 and December 31, 2025, respectively, approximate fair value and are reported on a gross basis in our consolidated balance sheets. A change in interest rates for ceded policy loans will not impact our financial position because the benefits and risks are fully ceded to reinsuring counterparties.

Miscellaneous Long-term Investments: Our shares of Federal Home Loan Bank (FHLB) common stock are carried at cost, which approximates fair value.

Policyholders' Account Balances: Funding agreements which represent cash advances used for the purpose of investing in either short-term investments, matched fixed maturity securities, or matched commercial mortgage loans. Carrying amounts approximate fair value.

Long-term Debt: Fair values for long-term debt are obtained from independent pricing services or discounted cash flow analyses based on current incremental borrowing rates for similar types of borrowing arrangements.

Other Liabilities: Funding agreements that represent cash advances used for the purpose of investing in either short-term investments, matched fixed maturity securities, or matched commercial mortgage loans. Unfunded equity commitments represent amounts that we have committed to fund investment partnerships. These commitments are legally binding, subject to the partnerships meeting specified conditions. Carrying amounts approximate fair value.
The following tables present the carrying amounts and estimated fair values of our financial instruments not measured at fair value and indicates the level in the fair value hierarchy of the estimated fair value measurement based on the observability of the inputs used:

March 31, 2026
Estimated Fair Value
Level 1Level 2Level 3TotalCarrying Value
(in millions of dollars)
Assets
Mortgage Loans$— $1,919.3 $— $1,919.3 $2,066.3 
Policy Loans— — 3,761.7 3,761.7 3,702.9 
Other Long-term Investments
Miscellaneous Long-term Investments— 42.5 0.2 42.7 42.7 
Total Financial Instrument Assets Not Carried at Fair Value$— $1,961.8 $3,761.9 $5,723.7 $5,811.9 
Liabilities
Policyholders' Account Balances
$— $106.5 $— $106.5 $106.5 
Long-term Debt2,992.7 559.4 — 3,552.1 3,762.0 
Other Liabilities— 585.6 — 585.6 585.6 
Total Financial Instrument Liabilities Not Carried at Fair Value$2,992.7 $1,251.5 $— $4,244.2 $4,454.1 
December 31, 2025
Estimated Fair Value
Level 1Level 2Level 3TotalCarrying Value
(in millions of dollars)
Assets
Mortgage Loans$— $1,965.1 $— $1,965.1 $2,109.5 
Policy Loans— — 3,739.5 3,739.5 3,668.1 
Other Long-term Investments
Miscellaneous Long-term Investments— 40.7 0.2 40.9 40.9 
Total Financial Instrument Assets Not Carried at Fair Value$— $2,005.8 $3,739.7 $5,745.5 $5,818.5 
Liabilities
Long-term Debt$2,548.2 $1,093.2 $— $3,641.4 $3,767.6 
Other Liabilities— 644.0 — 644.0 644.0 
Total Financial Instrument Liabilities Not Carried at Fair Value$2,548.2 $1,737.2 $— $4,285.4 $4,411.6 

Prior year amounts in the table above were reclassified to conform to current year presentation.

The carrying values of financial instruments such as short-term investments, cash and bank deposits, accounts and premiums receivable, accrued investment income, securities lending agreements, and short-term debt approximate fair value due to the short-term nature of the instruments. As such, these financial instruments are not included in the above chart.

Fair values for insurance contracts other than investment contracts are not required to be disclosed. However, the fair values of liabilities under all insurance contracts are taken into consideration in our overall management of interest rate risk, which seeks to minimize exposure to changing interest rates through the matching of investment maturities with amounts due under insurance contracts.
 [1]
[1] Real Assets - The limited partnerships described in this category employ various strategies, which include investing in the equity and/or debt financing of physical assets, including infrastructure (energy, power, water/wastewater, communications), transportation (including airports, ports, toll roads, aircraft, railcars) and real estate in North America, Europe, South America, and Asia.  As of March 31, 2026, the estimated remaining life of the investments that do not allow for redemptions is approximately 54 percent in the next 3 years, 23 percent during the period from 3 to 5 years, and 23 percent during the period from 5 to 10 years.
v3.26.1
Investments
 3 Months Ended
Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract]  
Investments
Fixed Maturity Securities

At March 31, 2026 and December 31, 2025, all fixed maturity securities were classified as available-for-sale. The amortized cost and fair values of securities by security type are shown as follows:

 March 31, 2026
 
Amortized
Cost, Gross of ACL1
ACL1
Gross
Unrealized
Gain		Gross
Unrealized
Loss		Fair
Value
(in millions of dollars)
United States Government and Government Agencies and Authorities $548.9 $— $13.2 $17.2 $544.9 
States, Municipalities, and Political Subdivisions3,413.2 — 61.9 475.1 3,000.0 
Foreign Governments989.4 — 14.9 159.4 844.9 
Public Utilities5,202.3 — 136.8 333.7 5,005.4 
Mortgage/Asset-Backed Securities2
1,371.9 — 7.7 22.7 1,356.9 
All Other Corporate Bonds23,997.1 — 386.3 1,842.5 22,540.9 
Redeemable Preferred Stocks8.0 — — 0.2 7.8 
Total Fixed Maturity Securities$35,530.8 $— $620.8 $2,850.8 $33,300.8 


December 31, 2025
 
Amortized
Cost, Gross of ACL1
ACL1
Gross
Unrealized
Gain		Gross
Unrealized
Loss		Fair
Value
(in millions of dollars)
United States Government and Government Agencies and Authorities$543.8 $— $17.2 $16.0 $545.0 
States, Municipalities, and Political Subdivisions3,450.7 — 73.8 466.4 3,058.1 
Foreign Governments1,008.8 — 18.8 157.3 870.3 
Public Utilities5,048.6 — 175.4 290.1 4,933.9 
Mortgage/Asset-Backed Securities2
1,187.3 — 9.3 17.3 1,179.3 
All Other Corporate Bonds23,500.0 5.9 527.5 1,559.5 22,462.1 
Redeemable Preferred Stocks8.0 — — 0.1 7.9 
Total Fixed Maturity Securities$34,747.2 $5.9 $822.0 $2,506.7 $33,056.6 

1Allowance for Credit Losses
2Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types
The following charts indicate the length of time our fixed maturity securities have been in a gross unrealized loss position.

 March 31, 2026
 Less Than 12 Months12 Months or Greater
 Fair
Value		Gross
Unrealized
Loss		Fair
Value		Gross
Unrealized
Loss
(in millions of dollars)
United States Government and Government Agencies and Authorities$26.2 $0.6 $233.6 $16.6 
States, Municipalities, and Political Subdivisions162.9 3.4 1,907.1 471.7 
Foreign Governments81.2 1.7 344.3 157.7 
Public Utilities1,048.6 32.9 1,668.0 300.8 
Mortgage/Asset-Backed Securities1
539.5 5.2 261.0 17.5 
All Other Corporate Bonds4,851.2 123.9 10,516.0 1,718.6 
Redeemable Preferred Stocks2
4.0 — 3.8 0.2 
Total Fixed Maturity Securities$6,713.6 $167.7 $14,933.8 $2,683.1 

 December 31, 2025
 Less Than 12 Months12 Months or Greater
 Fair
Value		Gross
Unrealized
Loss		Fair
Value		Gross
Unrealized
Loss
(in millions of dollars)
United States Government and Government Agencies and Authorities$21.8 $0.4 $235.6 $15.6 
States, Municipalities, and Political Subdivisions138.2 3.6 1,922.2 462.8 
Foreign Governments264.6 5.5 318.2 151.8 
Public Utilities642.1 19.4 1,710.3 270.7 
Mortgage/Asset-Backed Securities1
206.6 0.4 275.3 16.9 
All Other Corporate Bonds2,060.0 40.6 11,087.9 1,518.9 
Redeemable Preferred Stocks— — 3.9 0.1 
Total Fixed Maturity Securities$3,333.3 $69.9 $15,553.4 $2,436.8 

1Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types
2Includes a de minimis gross unrealized loss for which the length of time has been for less than 12 months
The following is a distribution of the maturity dates for fixed maturity securities. The maturity dates have not been adjusted for possible calls or prepayments.
 March 31, 2026
 
Amortized Cost, Net of ACL1
Unrealized Gain PositionUnrealized Loss Position
 Gross GainFair ValueGross LossFair Value
(in millions of dollars)
1 year or less$1,258.8 $2.8 $336.8 $5.4 $919.4 
Over 1 year through 5 years6,719.4 150.7 3,094.7 125.2 3,650.2 
Over 5 years through 10 years7,591.2 177.3 3,167.3 393.3 4,207.9 
Over 10 years18,589.5 282.3 4,498.2 2,304.2 12,069.4 
34,158.9 613.1 11,097.0 2,828.1 20,846.9 
Mortgage/Asset-Backed Securities2
1,371.9 7.7 556.4 22.7 800.5 
Total Fixed Maturity Securities$35,530.8 $620.8 $11,653.4 $2,850.8 $21,647.4 
 December 31, 2025
 
Amortized Cost, Net of ACL1
Unrealized Gain PositionUnrealized Loss Position
 Gross GainFair ValueGross LossFair Value
(in millions of dollars)
1 year or less$1,379.9 $3.4 $430.5 $5.1 $947.7 
Over 1 year through 5 years6,484.9 159.7 3,512.5 88.9 3,043.2 
Over 5 years through 10 years7,476.9 260.3 3,873.6 336.5 3,527.1 
Over 10 years18,212.3 389.3 5,655.9 2,058.9 10,886.8 
33,554.0 812.7 13,472.5 2,489.4 18,404.8 
Mortgage/Asset-Backed Securities2
1,187.3 9.3 697.4 17.3 481.9 
Total Fixed Maturity Securities$34,741.3 $822.0 $14,169.9 $2,506.7 $18,886.7 
1Allowance for Credit Losses
2Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types

The following chart depicts an analysis of our fixed maturity security portfolio between investment-grade and below-investment-grade categories as of March 31, 2026:

Gross Unrealized Loss
Fair ValueGross Unrealized GainAmountPercent of Total Gross Unrealized Loss
(in millions of dollars)
Investment-Grade$32,046.8 $605.8 $2,784.0 97.7 %
Below-Investment-Grade1,254.0 15.0 66.8 2.3 
Total Fixed Maturity Securities$33,300.8 $620.8 $2,850.8 100.0 %

The unrealized losses on investment-grade fixed maturity securities principally relate to changes in interest rates or changes in market or sector credit spreads which occurred subsequent to the acquisition of the securities. Below-investment-grade fixed maturity securities are generally more likely to develop credit concerns than investment-grade securities. At March 31, 2026, the unrealized losses in our below-investment-grade fixed maturity securities were generally due to credit spreads in certain industries or sectors and, to a lesser extent, credit concerns related to specific securities. For each specific security in an unrealized loss position, we believe that there are positive factors which mitigate credit concerns and that the securities for
which we have not recorded a credit loss will recover in value. We have the ability and intent to continue to hold these securities to recovery of amortized cost less allowance for credit losses.

As of March 31, 2026, we held 900 individual investment-grade fixed maturity securities and 66 individual below-investment-grade fixed maturity securities that were in an unrealized loss position, of which 753 investment-grade fixed maturity securities and 27 below-investment-grade fixed maturity securities had been in an unrealized loss position continuously for over one year.

In determining when a decline in fair value below amortized cost of a fixed maturity security represents a credit loss, we evaluate the following factors:

•Whether we expect to recover the entire amortized cost basis of the security
•Whether we intend to sell the security or will be required to sell the security before the recovery of its amortized cost basis
•Whether the security is current as to principal and interest payments
•The significance of the decline in value
•Current and future business prospects and trends of earnings
•The valuation of the security's underlying collateral
•Relevant industry conditions and trends relative to their historical cycles
•Market conditions
•Rating agency and governmental actions
•Bid and offering prices and the level of trading activity
•Adverse changes in estimated cash flows for securitized investments
•Changes in fair value subsequent to the balance sheet date
•Any other key measures for the related security

While determining whether a credit loss exists is a judgmental area, we utilize a formal, well-defined, and disciplined process to monitor and evaluate our fixed income investment portfolio, supported by issuer specific research and documentation as of the end of each period. The process results in a thorough evaluation of investments and the recording of credit losses on a timely basis for investments determined to have a credit loss. We calculate the allowance for credit losses of fixed maturity securities based on the present value of our best estimate of cash flows expected to be collected, discounted using the effective interest rate implicit in the security at the date of acquisition. When estimating future cash flows, we analyze the strength of the issuer’s balance sheet, its debt obligations and near-term funding arrangements, cash flow and liquidity, the profitability of its core businesses, the availability of marketable assets which could be sold to increase liquidity, its industry fundamentals and regulatory environment, and its access to capital markets.

The following table presents a rollforward of the allowance for credit losses on available-for-sale fixed maturity securities, which were classified as "all other corporate bonds" during the three months ended March 31, 2026 and March 31, 2025.

Three Months Ended March 31
20262025
(in millions of dollars)
Balance, beginning of period$5.9 $2.8 
Credit losses on securities for which credit losses were not previously recorded— 0.9 
Change in allowance due to change in intent to sell impaired security
(5.9)— 
Change in allowance on securities with allowance recorded in previous period— 0.1 
Balance, end of period$— $3.8 

At March 31, 2026, we had commitments of $158.9 million to fund private placement fixed maturity securities, the amount of which may or may not be funded.
Variable Interest Entities

We invest in variable interests issued by variable interest entities. These investments, which are passive in nature, include minority ownership interests in private equity partnerships and special purpose entities. Our maximum exposure to loss is limited to the carrying value of these investments in private equity partnerships and special purpose entities. For those variable interests that are not consolidated in our financial statements, we are not the primary beneficiary because we have neither the power to direct the activities that are most significant to economic performance nor the responsibility to absorb a majority of the expected losses. The determination of whether we are the primary beneficiary is performed at the time of our initial investment and at the date of each subsequent reporting period.

As of March 31, 2026, the carrying amount of our variable interest entity investments not consolidated in our financial statements, which are primarily private equity partnerships, totaled $1,444.1 million. At December 31, 2025, the carrying amount of our variable interest entity investments not consolidated in our financial statements, which are primarily private equity partnerships, totaled $1,456.3 million.  These variable interest entity investments are reported as other long-term investments in our consolidated balance sheets.

Mortgage Loans

Our mortgage loan portfolio is well diversified by both geographic region and property type to reduce risk of concentration. All of our mortgage loans are collateralized by commercial real estate. When issuing a new loan, our general policy is not to exceed a loan-to-value ratio, or the ratio of the loan balance to the estimated fair value of the underlying collateral, of 75 percent. We update the loan-to-value ratios based on internal valuation of the collateral at least every three years for each loan, and properties undergo a general inspection at least every two years. Our general policy for newly issued loans is to have a debt service coverage ratio greater than 1.25 times on a normalized 25 year amortization period. We update our debt service coverage ratios annually.

We carry our mortgage loans at amortized cost less an allowance for expected credit losses. The amortized cost of our mortgage loans was $2,081.6 million and $2,125.4 million at March 31, 2026 and December 31, 2025, respectively. The allowance for expected credit losses was $15.3 million and $15.9 million at March 31, 2026 and December 31, 2025, respectively. Interest income is accrued on the principal amount of the loan based on the loan's contractual interest rate. We report accrued interest income for our mortgage loans as accrued investment income on our consolidated balance sheets, and the amount of the accrued income was $6.6 million and $6.7 million at March 31, 2026 and December 31, 2025, respectively.
The carrying amount of mortgage loans by property type and geographic region are presented below.

March 31, 2026December 31, 2025
(in millions of dollars)
Carrying AmountPercent of TotalCarrying AmountPercent of Total
Property Type
Apartment$634.0 30.7 %$642.5 30.5 %
Industrial650.9 31.5 659.0 31.2 
Office283.4 13.7 313.3 14.9 
Retail470.4 22.8 467.0 22.1 
Other27.6 1.3 27.7 1.3 
Total$2,066.3 100.0 %$2,109.5 100.0 %
Region
New England$49.2 2.4 %$49.9 2.4 %
Mid-Atlantic158.0 7.6 159.9 7.6 
East North Central270.0 13.1 275.3 13.1 
West North Central134.6 6.5 135.9 6.4 
South Atlantic499.9 24.2 497.2 23.5 
East South Central88.6 4.3 96.7 4.6 
West South Central185.8 9.0 190.5 9.0 
Mountain235.1 11.4 255.3 12.1 
Pacific445.1 21.5 448.8 21.3 
Total$2,066.3 100.0 %$2,109.5 100.0 %

The risk in our mortgage loan portfolio is primarily related to vacancy rates. Events or developments, such as economic conditions that impact the ability of the borrowers to ensure occupancy of the property, may have a negative effect on our mortgage loan portfolio, particularly to the extent that our portfolio is concentrated in an affected region or property type. An increase in vacancies increases the probability of default, which would negatively affect our expected losses in our mortgage loan portfolio.

We evaluate each of our mortgage loans individually for impairment and assign an internal quality rating based on a comprehensive rating system used to evaluate the risk of the loan. The factors we use to derive our internal quality ratings may include the following:

•Loan-to-value ratio based on internal valuation of the property
•Debt service coverage ratio based on current operating income
•Property location, including regional economics, trends, and demographics
•Age, condition, and construction quality of property
•Current and historical occupancy of property
•Lease terms relative to market
•Tenant size and financial strength
•Borrower's financial strength
•Borrower's equity in collateral
•Additional collateral, if any

Although all available and applicable factors are considered in our analysis, loan-to-value and debt service coverage ratios are the most critical factors in determining whether we will initially issue the loan and also in assigning values and determining impairment. We assign an overall rating to each loan using an internal rating scale of AA (highest quality) to B (lowest
quality). We review and adjust, as needed, our internal quality ratings on an annual basis. This review process is performed more frequently for mortgage loans deemed to have a higher risk of delinquency.

We estimate an allowance for credit losses that we expect to incur over the life of our mortgage loans using a probability of default method. For each loan, we estimate the probability that the loan will default before its maturity (probability of default) and the amount of the loss if the loan defaults (loss given default). These two factors result in an expected loss percentage that is applied to the amortized cost of each loan to determine the expected credit loss. As we are the original underwriter of the mortgage loans, the amortized cost generally equals the principal amount of the loan. We measure losses on defaults of our mortgage loans as the excess amortized cost of the mortgage loan over the fair value of the underlying collateral in the event that we foreclose on the loan or over the expected future cash flows of the loan if we retain the mortgage loan until payoff. We do not purchase mortgage loans with existing credit impairments.

In estimating the probability of default, we consider historical experience, current market conditions, and reasonable and supportable forecasts about the future market conditions. We utilize our historical loan experience in combination with a large third-party industry database for a period of time that aligns with the average life of our loans based on the maturity dates of the loans and prepayment experience. Our model utilizes an industry database of the historical loss experience based on our actual portfolio characteristics such as loan-to-value, debt service coverage, collateral type, geography, and late payment history. In addition, because we actively manage our portfolio, we may extend the term of a loan in certain situations and will accordingly extend the maturity date in the estimate of probability of default. In estimating the loss given default, we primarily consider the type and value of collateral and secondarily the expected liquidation costs and time to recovery.

The primary market factors that we consider in our forecast of future market conditions are gross domestic product, unemployment rates, interest rates, inflation, commercial real estate values, household formation, and retail sales. We also forecast certain loan specific factors such as growth in the fair value and net operating income of collateral by property type. We include our estimate of these factors over a two-year period and for the remainder of the loans’ estimated lives, adjusted for estimated prepayments. Past the two-year forecast period, we revert to the historical assumptions ratably by the end of the fifth year of the loan after which we utilize only historical assumptions.

We utilize various scenarios to estimate our allowance for expected losses ranging from a base case scenario that reflects normal market conditions to a severe case scenario that reflects adverse market conditions. We will adjust our allowance each period to utilize the scenario or weighting of the scenarios that best reflects our view of current market conditions.
The following tables present information about mortgage loans by the applicable internal quality indicators:

March 31, 2026December 31, 2025
(in millions of dollars)
Carrying AmountPercent of TotalCarrying AmountPercent of Total
Internal Mortgage Rating
AA$128.5 6.2 %$125.6 6.0 %
A1,015.7 49.1 1,053.4 49.9 
BBB819.3 39.7 804.0 38.1 
BB97.0 4.7 120.5 5.7 
B5.8 0.3 6.0 0.3 
Total$2,066.3 100.0 %$2,109.5 100.0 %
Loan-to-Value Ratio1
<= 65%$1,703.4 82.5 %$1,701.2 80.6 %
> 65% <= 75%151.3 7.3 164.3 7.8 
> 75% <= 85%130.8 6.3 162.6 7.7 
> 85%80.8 3.9 81.4 3.9 
Total$2,066.3 100.0 %$2,109.5 100.0 %
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
The following tables present the amortized cost of our mortgage loans by year of origination and internal quality indicators at March 31, 2026 and December 31, 2025, respectively.

March 31, 2026
Prior to 202220222023202420252026Total
(in millions of dollars)
Internal Mortgage Rating
AA$128.6 $— $— $— $— $— $128.6 
A894.7 23.3 9.4 6.4 76.9 6.8 1,017.5 
BBB617.0 61.6 56.5 39.3 36.3 12.3 823.0 
BB77.9 — — — 20.4 — 98.3 
B14.2 — — — — — 14.2 
Total Amortized Cost1,732.4 84.9 65.9 45.7 133.6 19.1 2,081.6 
Allowance for credit losses(13.8)(0.3)(0.3)(0.2)(0.6)(0.1)(15.3)
Carrying Amount$1,718.6 $84.6 $65.6 $45.5 $133.0 $19.0 $2,066.3 
Loan-to-Value Ratio1
<=65%$1,486.8 $62.5 $38.4 $11.6 $89.1 $19.1 $1,707.5 
>65<=75%57.8 8.4 27.5 34.1 24.1 — 151.9 
>75%<=85%118.2 14.0 — — — — 132.2 
>85%69.6 — — — 20.4 — 90.0 
Total Amortized Cost1,732.4 84.9 65.9 45.7 133.6 19.1 2,081.6 
Allowance for credit losses(13.8)(0.3)(0.3)(0.2)(0.6)(0.1)(15.3)
Carrying Amount$1,718.6 $84.6 $65.6 $45.5 $133.0 $19.0 $2,066.3 
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
December 31, 2025
Prior to 2021
20212022202320242025Total
(in millions of dollars)
Internal Mortgage Rating
AA$100.1 $25.6 $— $— $— $— $125.7 
A794.0 144.9 23.6 9.5 6.4 77.2 1,055.6 
BBB482.4 131.2 61.8 56.7 39.4 36.4 807.9 
BB81.7 19.9 — — — 20.4 122.0 
B14.2 — — — — — 14.2 
Total Amortized Cost1,472.4 321.6 85.4 66.2 45.8 134.0 2,125.4 
Allowance for credit losses(13.5)(0.9)(0.3)(0.4)(0.2)(0.6)(15.9)
Carrying Amount$1,458.9 $320.7 $85.1 $65.8 $45.6 $133.4 $2,109.5 
Loan-to-Value Ratio1
<=65%$1,264.1 $238.9 $63.0 $38.5 $11.6 $89.4 $1,705.5 
>65<=75%59.8 10.7 8.4 27.7 34.2 24.2 165.0 
>75%<=85%115.5 35.0 14.0 — — — 164.5 
>85%33.0 37.0 — — — 20.4 90.4 
Total Amortized Cost1,472.4 321.6 85.4 66.2 45.8 134.0 2,125.4 
Allowance for credit losses(13.5)(0.9)(0.3)(0.4)(0.2)(0.6)(15.9)
Carrying Amount$1,458.9 $320.7 $85.1 $65.8 $45.6 $133.4 $2,109.5 
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
The following tables present a roll-forward of allowance for expected credit losses by loan-to-value ratio for the three months ended March 31, 2026 and 2025:
Three Months Ended March 31, 2026
Beginning of YearCurrent Period ProvisionsWrite-OffsRecoveriesEnd of Period
(in millions of dollars)
Loan-to-Value Ratio1
<=65%$4.3 $(0.2)$— $— $4.1 
>65<=75%0.7 (0.1)— — 0.6 
>75%<=85%1.9 (0.5)— — 1.4 
>85%9.0 0.2 — — 9.2 
Total$15.9 $(0.6)$— $— $15.3 
Three Months Ended March 31, 2025
Beginning of YearCurrent Period ProvisionsWrite-OffsRecoveriesEnd of Period
(in millions of dollars)
Loan-to-Value Ratio1
<=65%$4.2 $(0.4)$— $— $3.8 
>65<=75%1.7 — — — 1.7 
>75%<=85%2.2 0.9 — — 3.1 
>85%8.0 — — — 8.0 
Total $16.1 $0.5 $— $— $16.6 
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property

During the three months ended March 31, 2026, no commercial mortgage loans were modified for borrowers experiencing financial difficulties. During the three months ended March 31, 2025, we granted an other-than-insignificant payment delay for a commercial mortgage loan with an amortized cost of $14.2 million, which deferred the principal payment for twenty-four months. This modification represents less than one percent of the commercial mortgage loan portfolio balance. For the three months ended March 31, 2026, all commercial mortgage loans which were previously modified for borrowers experiencing financial difficulties were current.

As of March 31, 2026 and December 31, 2025, we held no specifically identified impaired mortgage loans. There were no commercial mortgage loans past due as to principal and/or interest payments as of March 31, 2026 and December 31, 2025.

We had no loan foreclosures for the three months ended March 31, 2026 and 2025.

At March 31, 2026, we had no commitments to fund certain commercial mortgage loans. Consistent with how we determine the estimate of current expected credit losses for our funded mortgage loans each period, we estimate expected credit losses for loans that have not been funded but we are committed to fund at the end of each period. At March 31, 2026 and December 31, 2025, we had no expected credit losses related to unfunded commitments on our consolidated balance sheets.

Investment Real Estate

Our investment real estate held for the production of income balance was $40.6 million and $41.7 million at March 31, 2026 and December 31, 2025, respectively, and the associated accumulated depreciation was $131.2 million and $130.1 million at March 31, 2026 and December 31, 2025, respectively. We monitor and assess our real estate investments for impairment when facts and circumstances indicate that the real estate may be impaired.
Our held for sale real estate balance was $41.9 million at both March 31, 2026 and December 31, 2025. The associated accumulated depreciation was $57.5 million at both March 31, 2026 and December 31, 2025. The estimated fair value less costs to sell is above the carrying value of the properties and we expect to close the sale of the properties within the next twelve months.

Transfers of Financial Assets

To manage our cash position more efficiently, we may enter into repurchase agreements with unaffiliated financial institutions. We generally use repurchase agreements as a means to finance the purchase of invested assets or for short-term general business purposes until projected cash flows become available from our operations or existing investments. Our repurchase agreements are typically outstanding for less than 30 days. We post collateral through our repurchase agreement transactions whereby the counterparty commits to purchase securities with the agreement to resell them to us at a later, specified date. The fair value of collateral posted is generally 102 percent of the cash received.

Our investment policy also permits us to lend fixed maturity securities to unaffiliated financial institutions in short-term securities lending agreements. These agreements increase our investment income with minimal risk. Our securities lending policy requires that a minimum of 102 percent of the fair value of the securities loaned be maintained as collateral. We may receive cash and/or securities as collateral under these agreements. Cash received as collateral is typically reinvested in short-term investments. If securities are received as collateral, we are not permitted to sell or re-post them.

As of March 31, 2026, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $95.7 million, for which we received collateral in the form of cash and securities of $61.7 million and $37.6 million, respectively. As of December 31, 2025, the carrying amount of fixed maturity securities loaned to third parties under our securities lending program was $106.1 million, for which we received collateral in the form of cash and securities of $76.1 million and $34.1 million, respectively. We had no outstanding repurchase agreements at March 31, 2026 or December 31, 2025.

The remaining contractual maturities of our securities lending agreements disaggregated by class of collateral pledged are as follows:

March 31, 2026December 31, 2025
Overnight and Continuous
(in millions of dollars)
Borrowings
United States Government and Government Agencies and Authorities$0.3 $0.3 
Public Utilities0.8 4.8 
Short-Term Investments
— 0.1
All Other Corporate Bonds60.6 70.9 
Total Borrowings61.7 76.1 
Gross Amount of Recognized Liability for Securities Lending Transactions61.7 76.1 
Amounts Related to Agreements Not Included in Offsetting Disclosure Contained Herein$— $— 

Certain of our U.S. insurance subsidiaries are members of regional FHLBs. As members of the FHLBs, our insurance subsidiaries have the ability to borrow on a collateralized basis from the FHLBs. Each member is required to hold a certain minimum amount of FHLB common stock as a condition of membership and additional amounts based on the amount of the borrowings. Advances received from the FHLB are primarily used for the purchase of short-term investments, matched fixed
maturity securities, or matched commercial mortgage loans. The carrying value of common stock owned, collateral posted, and advances received are as follows:

March 31, 2026December 31, 2025
(in millions of dollars)
Carrying Value of FHLB Common Stock$42.5 $40.7 
Advances from FHLB691.9 643.8 
Carrying Value of Collateral Posted to FHLB
Fixed Maturity Securities$800.2 $752.4 
Commercial Mortgage Loans1,078.0 1,110.2 
Total Carrying Value of Collateral Posted to FHLB$1,878.2 $1,862.6 

Funding Agreement-Backed Loan Program

During February 2026, we established a funding agreement-backed loan (FABL) program, pursuant to which a special purpose unaffiliated Delaware statutory trust (the FABL trust) may borrow funds under a six-month delayed draw term loan facility (the facility) and deposit the proceeds with Colonial Life & Accident Insurance Company (Colonial Life & Accident), a wholly owned insurance subsidiary, pursuant to funding agreements issued by Colonial Life & Accident to the FABL trust.  Colonial Life & Accident does not hold any variable interests in the FABL trust. The deposits received by Colonial Life & Accident under the funding agreements will be used for spread lending purposes.  The facility permits borrowings by the FABL trust in two tranches, in an aggregate principal amount of up to $500.0 million, with scheduled maturities on the third and fifth anniversaries, respectively, of the date that is six months after the date of the applicable credit agreement.  The funding agreements issued by Colonial Life & Accident will have matching interest, maturity and payment terms to the applicable borrowings by the FABL trust.  The funding agreements may be collateralized by eligible securities, including agency securities, corporate bonds, municipal bonds, and U.S. Treasury securities.  As of March 31, 2026, we did not have any amounts outstanding under the FABL program.

Offsetting of Financial Instruments

We enter into master netting agreements with each of our derivative's counterparties. These agreements provide for conditional rights of set-off upon the occurrence of an early termination event. An early termination event is considered a default, and it allows the non-defaulting party to offset its contracts in a loss position against any gain positions or payments due to the defaulting party. Under our agreements, default type events are defined as failure to pay or deliver as contractually agreed, misrepresentation, bankruptcy, or merger without assumption. See Note 5 for further discussion of collateral related to our derivative contracts.

We have securities lending agreements with unaffiliated financial institutions that post collateral to us in return for the use of our fixed maturity securities. A right of set-off exists that allows us to keep and apply collateral received in the event of default by the counterparty. Default within a securities lending agreement would typically occur if the counterparty failed to return the securities borrowed from us as contractually agreed. In addition, if we default by not returning collateral received, the counterparty has a right of set-off against our securities or any other amounts due to us.
Shown below are our financial instruments that either meet the accounting requirements that allow them to be offset in our balance sheets or that are subject to an enforceable master netting arrangement or similar agreement. Our accounting policy is to not offset these financial instruments in our balance sheets. Net amounts disclosed below have been reduced by the amount of collateral pledged to or received from our counterparties.

March 31, 2026
Gross AmountGross Amount Not
of RecognizedGross AmountNet AmountOffset in Balance Sheet
FinancialOffset inPresented inFinancialCashNet
InstrumentsBalance SheetBalance SheetInstrumentsCollateralAmount
(in millions of dollars)
Financial Assets:
Derivatives$60.7 $— $60.7 $(60.1)$(0.5)$0.1 
Securities Lending95.7 — 95.7 (34.0)(61.7)— 
Total$156.4 $— $156.4 $(94.1)$(62.2)$0.1 
Financial Liabilities:
Derivatives$261.0 $— $261.0 $(260.8)$— $0.2 
Securities Lending61.7 — 61.7 (61.7)— — 
Total$322.7 $— $322.7 $(322.5)$— $0.2 

December 31, 2025
Gross AmountGross Amount Not
of RecognizedGross AmountNet AmountOffset in Balance Sheet
FinancialOffset inPresented inFinancialCashNet
InstrumentsBalance SheetBalance SheetInstrumentsCollateralAmount
(in millions of dollars)
Financial Assets:
Derivatives$51.9 $— $51.9 $(51.9)$— $— 
Securities Lending106.1 — 106.1 (30.0)(76.1)— 
Total$158.0 $— $158.0 $(81.9)$(76.1)$— 
Financial Liabilities:
Derivatives$269.7 $— $269.7 $(269.3)$— $0.4 
Securities Lending76.1 — 76.1 (76.1)— — 
Total$345.8 $— $345.8 $(345.4)$— $0.4 
Net Investment Income

Net investment income reported in our consolidated statements of income is presented below.

 Three Months Ended March 31
 20262025
 (in millions of dollars)
Fixed Maturity Securities$425.4 $463.3 
Derivatives3.6 (4.2)
Mortgage Loans21.6 21.8 
Policy Loans5.3 5.2 
Other Long-term Investments
Perpetual Preferred Securities
— 0.8 
Private Equity Partnerships1
23.2 18.3 
Other4.2 4.3 
Short-term Investments24.8 28.0 
Gross Investment Income508.1 537.5 
Less Investment Expenses21.8 21.4 
Less Investment Income on Participation Fund Account Assets2.9 2.9 
Net Investment Income$483.4 $513.2 

1The net unrealized gain recognized in net investment income for the three months ended March 31, 2026 related to private equity partnerships still held at March 31, 2026 was $29.7 million, reduced by net management fees and partnership expenses of $(6.5) million. The net unrealized gain (loss) recognized in net investment income for the three months ended March 31, 2025 related to private equity partnerships still held at March 31, 2025 was $26.4 million, reduced by net management fees and partnership expense of $(8.1) million. See Note 3 for further discussion of private equity partnerships.
Investment Gain and Loss

Investment gains and losses are as follows:

 Three Months Ended March 31
 20262025
 (in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales$1.3 $0.6 
Gross Losses on Sales1
(1.8)(45.3)
Impairment Loss2
(8.1)(152.4)
Credit Losses5.9 (1.0)
Mortgage Loans and Other Invested Assets
Impairment Loss
— (3.8)
Change in Allowance for Credit Losses0.6 (0.4)
Embedded Derivative in Modified Coinsurance Arrangement(3.0)(1.9)
All Other Derivatives1.5 (5.3)
Foreign Currency Transactions(1.4)2.7 
Net Investment Loss$(5.0)$(206.8)

1During the three months ended March 31, 2025, we recognized a $23.5 million net loss on sales of fixed maturity securities related to the Closed Block long-term care and Unum US individual disability reinsurance transaction (Fortitude Re reinsurance transaction) and a $19.1 million loss on sales of fixed maturity securities related to the funding of an extraordinary dividend from a wholly owned insurance subsidiary to Unum Group.
2 During the three months ended March 31, 2025, we recognized a $152.4 million impairment loss based on the intent to dispose of fixed maturity securities with a fair value of $1,250.9 million related to the Fortitude Re reinsurance transaction.
v3.26.1
Derivative Financial Instruments
 3 Months Ended
Mar. 31, 2026
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative Financial Instruments
Note 5 - Derivative Financial Instruments

Purpose of Derivatives

We are exposed to certain risks relating to our ongoing business operations. The primary risks managed by using derivative instruments are interest rate risk, risk related to matching duration for our assets and liabilities, foreign currency risk, credit risk, and equity risk. Historically, we have utilized current and forward interest rate swaps, current and forward currency swaps, forward benchmark interest rate locks, currency forward contracts, forward contracts on specific fixed income securities, and total return swaps. Transactions hedging interest rate risk are primarily associated with our individual and group long-term care and individual and group disability products. All other product portfolios are periodically reviewed to determine if hedging strategies would be appropriate for risk management purposes. We do not use derivative financial instruments for speculative purposes.

Derivatives designated as cash flow hedges and used to reduce our exposure to interest rate and duration risk are as follows:

•Interest rate swaps were used to hedge interest rate risks and to improve the matching of assets and liabilities. An interest rate swap is an agreement in which we agree with other parties to exchange, at specified intervals, the difference between fixed rate and variable rate interest amounts. We used interest rate swaps to hedge the anticipated purchase of fixed maturity securities thereby protecting us from the potential adverse impact of declining interest rates on the associated policy reserves. We also used interest rate swaps to hedge the potential adverse impact of rising interest rates in anticipation of issuing fixed rate long-term debt.

•Forward benchmark interest rate locks are used to minimize interest rate risk associated with the anticipated purchase or associated future coupons of fixed maturity securities or the anticipated issuance of fixed rate long-term debt. A
forward benchmark interest rate lock is a derivative contract without an initial investment where we and the counterparty agree to purchase or sell a specific benchmark interest rate fixed maturity bond at a future date at a predetermined price or yield.

Derivatives designated as either cash flow or fair value hedges and used to reduce our exposure to foreign currency risk are as follows:

•Foreign currency interest rate swaps are used to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for portfolio diversification. Under these swap agreements, we agree to pay, at specified intervals, fixed rate foreign currency-denominated principal and interest payments in exchange for fixed rate payments in the functional currency of the operating segment.

Derivatives not designated as hedging instruments, which are used to reduce our exposure to foreign currency risk, volatility of the underlying deferred assets in our non-qualified defined contribution plan, and credit risk are as follows:

•Foreign currency interest rate swaps previously designated as hedges were used to hedge the currency risk of certain foreign currency-denominated fixed maturity securities owned for portfolio diversification. These derivatives were effective hedges prior to novation to a new counterparty. In conjunction with the novation, these derivatives were de-designated as hedges. We agree to pay, at specified intervals, fixed rate foreign currency-denominated principal and interest payments in exchange for fixed rate payments in the functional currency of the operating segment. We hold offsetting swaps wherein we agree to pay fixed rate principal and interest payments in the functional currency of the operating segment in exchange for fixed rate foreign currency-denominated payments.

•Foreign currency forward contracts are used to minimize foreign currency risk. A foreign currency forward is a derivative without an initial investment where we and the counterparty agree to exchange a specific amount of currencies, at a specific exchange rate, on a specific date. We use these forward contracts to hedge the currency risk arising from foreign-currency denominated investments.

•Total Return Swaps are used to economically hedge a portion of the liability related to our non-qualified defined contribution plan and hedge the economic risk from credit spread and interest rate duration related to certain cash and cash equivalent amounts. A total return swap is an agreement in which we pay a floating rate of interest to the counterparty and receive the total return on a portfolio of mutual funds and/or exchange traded funds. These swaps are cash settled on the last day of every month and the notional is re-established each month based on plan participant actions or cash settled at maturity.
Derivative Risks

The basic types of risks associated with derivatives are market risk (that the value of the derivative will be adversely impacted by changes in the market, primarily changes in interest rates, exchange rates, and equity prices) and credit risk (that the counterparty will not perform according to the terms of the contract). The market risk of the derivatives should generally offset the market risk associated with the hedged financial instrument or liability. To help limit the credit exposure of the derivatives, we enter into master netting agreements with our counterparties whereby contracts in a gain position can be offset against contracts in a loss position. We also typically enter into bilateral, cross-collateralization agreements with our counterparties to help limit the credit exposure of the derivatives. These agreements require the counterparty in a loss position to submit acceptable collateral with the other counterparty in the event the net loss position meets or exceeds an agreed upon amount. Credit exposure on derivatives is limited to the value of those contracts in a net gain position, including accrued interest receivable less collateral held. At March 31, 2026, we had $0.1 million credit exposure on derivatives. At December 31, 2025, we had no credit exposure on derivatives. The table below summarizes the nature and amount of collateral received from and posted to our derivative counterparties.
March 31, 2026December 31, 2025
(in millions of dollars)
Carrying Value of Collateral Received from Counterparties
Cash$0.5 $1.6 
Fixed Maturity Securities9.1 4.2 
$9.6 $5.8 
Carrying Value of Collateral Posted to Counterparties
Cash$13.3 $— 
Fixed Maturity Securities235.9 244.3 
$249.2 $244.3 

See Note 4 for further discussion of our master netting agreements.

All of our derivative instruments contain provisions that require us to maintain specified issuer credit ratings and financial strength ratings. Should our ratings fall below these specified levels, we would be in violation of the provisions, and our derivatives counterparties could terminate our contracts and request immediate payment. The aggregate fair value of all derivative instruments with credit risk-related contingent features that were in a liability position was $261.0 million and $269.7 million at March 31, 2026 and December 31, 2025, respectively.

Cash Flow Hedges

As of March 31, 2026 and December 31, 2025, we had $120.0 million and $127.3 million, respectively, notional amount of receive fixed, pay fixed, open current and forward foreign currency interest rate swaps to hedge fixed income foreign currency-denominated securities.

As of March 31, 2026 and December 31, 2025, we had $2,526.0 million and $2,603.0 million, respectively, notional amount of forward benchmark interest rate locks to hedge the anticipated purchase of fixed maturity securities.

As of March 31, 2026, we expect to amortize approximately $1.8 million of net deferred gains on derivative instruments during the next twelve months. This amount will be reclassified from AOCI into earnings and reported on the same income statement line item as the hedged item. The income statement line items that will be affected by this amortization are net investment income and interest and debt expense. Additional amounts that may be reclassified from AOCI into earnings to offset the earnings impact of foreign currency translation of hedged items are not estimable.

As of March 31, 2026, we are hedging the variability of future cash flows associated with forecasted transactions through the year 2053.
Fair Value Hedges

As of March 31, 2026 and December 31, 2025, we had $822.6 million and $768.6 million, respectively, notional amount of receive fixed, pay fixed, open current and forward foreign currency interest rate swaps to hedge fixed income foreign currency-denominated securities.

The following tables summarize the amortized cost, carrying amount of hedged assets, and the related cumulative basis adjustments related to our fair value hedges:

March 31, 2026
(in millions of dollars)
Amortized Cost of Hedged Assets
Carrying Amount of Hedged Assets
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets
Fixed maturity securities:
Receive fixed functional currency interest, pay fixed foreign currency interest
$799.8 $683.6 $17.7 
December 31, 2025
(in millions of dollars)
Amortized Cost of Hedged Assets
Carrying Amount of Hedged Assets
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets
Fixed maturity securities:
Receive fixed functional currency interest, pay fixed foreign currency interest
$793.4 $695.0 $24.7 

For the three months ended March 31, 2026 and March 31, 2025, $4.7 million and $27.2 million, respectively, of the derivative instruments' gain related to cross-currency basis spread and forward points was excluded from the assessment of hedge effectiveness. There were no instances wherein we discontinued fair value hedge accounting due to a hedged firm commitment no longer qualifying as a fair value hedge.

Derivatives not Designated as Hedging Instruments

As of March 31, 2026 and December 31, 2025, we held $102.3 million and $115.6 million, respectively, notional amount of receive fixed, pay fixed, foreign currency interest rate swaps. These derivatives are not designated as hedges, and as such, changes in fair value related to these derivatives are reported in earnings as a component of net investment gain or loss.

As of March 31, 2026 and December 31, 2025, we held $47.1 million and $48.9 million, respectively, notional amount of foreign currency forwards to mitigate the foreign currency risk associated with specific securities owned. These derivatives are not designated as hedges, and as such, changes in fair value related to these derivatives are reported in earnings as a component of net investment gain or loss.

As of March 31, 2026 and December 31, 2025, we held $151.4 million and $154.8 million, respectively, notional amount of total return swaps to mitigate the volatility associated with changes in the fair value of the underlying notional assets in our non-qualified defined contribution plan. This derivative is an economic hedge not designated as a hedging instrument, and changes in fair value are reported as a component of other expenses in our income statement.

As of March 31, 2026 and December 31, 2025, we held no total return swap contracts to mitigate the economic risk from credit spreads and interest rate duration related to certain cash and cash equivalent amounts. During the first quarter of 2025, we
entered into a total return swap contract with a notional amount of $700.0 million. This derivative was an economic hedge not designated as a hedging instrument, and changes in fair value were reported in realized gains or losses in our income statement. Expenses and dividend payments were reported in earnings as a component of net investment income. The total return swap was unwound and settled for cash in the second quarter of 2025.

We have an embedded derivative in a modified coinsurance arrangement for which we include in our net investment gains and losses a calculation intended to estimate the value of the option of our reinsurance counterparty to cancel the reinsurance contract with us. However, neither party can unilaterally terminate the reinsurance agreement except in extreme circumstances resulting from regulatory supervision, delinquency proceedings, or other direct regulatory action. Cash settlements or collateral related to this embedded derivative are not required at any time during the reinsurance contract or at termination of the reinsurance contract. There are no credit-related counterparty triggers, and any accumulated embedded derivative gain or loss reduces to zero over time as the reinsured business winds down.

Locations and Amounts of Derivative Financial Instruments

The following tables summarize the notional amounts and fair values of derivative financial instruments, as reported in our consolidated balance sheets. Derivative assets are included in other long-term investments, while derivative liabilities are included in other liabilities within our consolidated balance sheets. The notional amounts represent the basis upon which our counterparty pay and receive amounts are calculated.

 March 31, 2026
 Derivative AssetsDerivative Liabilities
 Notional
Amount		Fair
Value		Fair
Value
(in millions of dollars)
Designated as Hedging Instruments
Cash Flow Hedges
Forward Benchmark Interest Rate Locks$2,526.0 $0.9 $218.7 
Foreign Currency Interest Rate Swaps120.0 14.3 1.1 
Total Cash Flow Hedges2,646.0 15.2 219.8 
Fair Value Hedges
Foreign Currency Interest Rate Swaps822.6 44.5 26.9 
Total Designated as Hedging Instruments$3,468.6 $59.7 $246.7 
Not Designated as Hedging Instruments
Foreign Currency Forwards$47.1 $0.8 $0.7 
Foreign Currency Interest Rate Swaps102.3 0.2 13.6 
Total Return Swaps151.4 — — 
Embedded Derivative in Modified Coinsurance Arrangement— 14.8 — 
Total Not Designated as Hedging Instruments$300.8 $15.8 $14.3 
Total Derivatives$3,769.4 $75.5 $261.0 
 December 31, 2025
 Derivative AssetsDerivative Liabilities
 Notional
Amount		Fair
Value		Fair
Value
(in millions of dollars)
Designated as Hedging Instruments
Cash Flow Hedges
Forward Benchmark Interest Rate Locks$2,603.0 $2.3 $222.9 
Foreign Currency Interest Rate Swaps127.3 14.3 1.7 
Total Cash Flow Hedges2,730.3 16.6 224.6 
Fair Value Hedges
Foreign Currency Interest Rate Swaps768.6 35.0 29.0 
Total Designated as Hedging Instruments$3,498.9 $51.6 $253.6 
Not Designated as Hedging Instruments
Foreign Currency Forwards$48.9 $0.1 $1.0 
Foreign Currency Interest Rate Swaps115.6 0.2 15.1 
Total Return Swaps154.8 — — 
Embedded Derivative in Modified Coinsurance Arrangement— 17.8 — 
Total Not Designated as Hedging Instruments$319.3 $18.1 $16.1 
Total Derivatives$3,818.2 $69.7 $269.7 
The following tables summarize the location of gains and losses of derivative financial instruments designated as hedging instruments, as reported in our consolidated statements of income.

 Three Months Ended March 31
20262025
Net Investment IncomeNet Investment Gain (Loss)Interest and Debt ExpenseNet Investment IncomeNet Investment Gain (Loss)Interest and Debt Expense
 (in millions of dollars)
Total Income and Expense Presented in the Consolidated Statements of Income of Which Hedged Items are Recorded$483.4 $(5.0)$53.1 $513.2 $(206.8)$52.0 
Gain (Loss) on Cash Flow Hedging Relationships
Interest Rate Swaps:
Hedged items10.8 — 0.7 17.4 (0.4)0.7 
Derivatives Designated as Hedging Instruments1.3 — — 2.6 0.4 — 
Foreign Exchange Contracts:
Hedged items1.8 (1.5)— 2.3 — — 
Derivatives Designated as Hedging Instruments0.1 1.0 — (0.7)— — 
Forward Benchmark Interest Rate Locks:
Hedged items16.7 — — 12.3 — — 
Derivatives Designated as Hedging Instruments(0.5)— — (0.4)— — 
Gain (Loss) on Fair Value Hedging Relationships
Foreign Exchange Contracts
Hedged items5.9 (7.0)— 4.4 21.5 — 
Derivatives Designated as Hedging Instruments2.8 7.0 — (5.2)(21.5)— 

The following table summarizes the location of gains and losses of derivative financial instruments designated as cash flow hedging instruments, as reported in our consolidated statements of comprehensive income (loss).

Three Months Ended March 31
 20262025
 (in millions of dollars)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives
Forward Benchmark Interest Rate Locks
$(8.9)$31.5 
Foreign Exchange Contracts0.5 1.0 
Total$(8.4)$32.5 
The following table summarizes the location of gains and losses on our derivatives not designated as hedging instruments, as reported in our consolidated statements of income.

 Three Months Ended March 31
 20262025
 (in millions of dollars)
Net Investment Gain (Loss)
Foreign Exchange Contracts$1.5 $(2.0)
Embedded Derivative in Modified Coinsurance Arrangement(3.0)(1.9)
Total Return Swaps
— (3.2)
Total$(1.5)$(7.1)
Net Investment Income
Total Return Swaps
$— $0.1 
Other Expenses
(Gain) Loss on Total Return Swaps
$5.6 $4.3 
v3.26.1
Accumulated Other Comprehensive Income (Loss)
 3 Months Ended
Mar. 31, 2026
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Income (Loss)
Components of accumulated other comprehensive loss (AOCI), after tax, and related changes are as follows:

Net Unrealized Loss on Securities
Effect of Change in Discount Rate Assumptions on the LFPB1
Net Loss on Derivatives
Foreign Currency Translation AdjustmentUnrecognized Pension and Postretirement Benefit CostsTotal
(in millions of dollars)
Balance at December 31, 2025$(2,003.1)$929.9 $(278.8)$(245.6)$(210.9)$(1,808.5)
Other Comprehensive Income (Loss) Before Reclassifications(431.3)465.2 (2.0)(23.0)1.2 10.1 
Amounts Reclassified from AOCI
2.1 — (1.3)— 2.1 2.9 
Net Other Comprehensive Income (Loss)(429.2)465.2 (3.3)(23.0)3.3 13.0 
Balance at March 31, 2026$(2,432.3)$1,395.1 $(282.1)$(268.6)$(207.6)$(1,795.5)
Balance at December 31, 2024$(2,755.2)$1,185.4 $(270.7)$(343.0)$(340.2)$(2,523.7)
Other Comprehensive Income (Loss) Before Reclassifications265.6 (166.3)47.5 42.3 (1.8)187.3 
Amounts Reclassified from AOCI
156.4 — (2.0)— 3.2 157.6 
Net Other Comprehensive Income (Loss)422.0 (166.3)45.5 42.3 1.4 344.9 
Balance at March 31, 2025$(2,333.2)$1,019.1 $(225.2)$(300.7)$(338.8)$(2,178.8)
1Liability for Future Policy Benefits
Amounts reclassified from AOCI were recognized in our consolidated statements of income as follows:

Three Months Ended March 31
20262025
(in millions of dollars)
Net Unrealized Loss on Securities
Net Investment Loss on Fixed Maturity Securities
Net Loss on Sales$(0.5)$(44.7)
Impairment Loss(8.1)(152.4)
Change in Allowance for Credit Losses1
5.9 (1.0)
(2.7)(198.1)
Income Tax Benefit(0.6)(41.7)
Total$(2.1)$(156.4)
Net Loss on Derivatives
Net Investment Income
Gain on Interest Rate Swaps and Forwards$0.8 $2.2 
Net Investment Gain
Gain on Interest Rate Swaps— 0.4 
Gain (Loss) on Foreign Currency Interest Rate Swaps0.9 (0.1)
1.7 2.5 
Income Tax Expense0.4 0.5 
Total$1.3 $2.0 
Unrecognized Pension and Postretirement Benefit Costs
Other Expenses
Amortization of Net Actuarial Loss$(2.7)$(4.1)
Amortization of Prior Service Credit0.1 0.1 
(2.6)(4.0)
Income Tax Benefit(0.5)(0.8)
Total$(2.1)$(3.2)
1Includes change in allowance on securities impaired, sold or otherwise disposed during the period.
v3.26.1
Financial Services, Insurance
 3 Months Ended
Mar. 31, 2026
Insurance [Abstract]  
Long-Duration Insurance Contracts Disclosure
Liabilities for future policy benefits represent the cost of claims that we estimate we will eventually pay to our policyholders which includes policy liabilities for claims not yet incurred and for claims that have been incurred or are estimated to have been incurred but not yet reported to us. Liabilities for future policy benefits also include the related expenses for our non interest-sensitive life and accident and health products. The liability for future policy benefits is calculated based on the present value of the estimated future policy benefits less the present value of estimated future net premiums collected. Net premiums represent the portion of the gross premium required to provide for all benefits and expenses, excluding acquisition costs or any costs that are required to be charged to expense as incurred. In calculating the liability for future policy benefits, our long-duration contracts are grouped into cohorts by product type and contract issue year.

The calculation of the liability for future policy benefits involves numerous assumptions including assumptions related to discount rate, lapses, mortality, and morbidity. Cash flow assumptions are reviewed and updated, as needed, at least annually. Assumptions may be updated more frequently if necessary based on trending experience and future expectations. On a quarterly basis, cohort level cash flow measures are updated based on the emergence of actual experience.

The initial, also referred to as the original, discount rate assumptions established for each cohort are used to determine interest accretion. After policy issuance or policy renewal, the discount rate assumptions are updated quarterly and used to update the liability at each reporting date to the current discount rate. The weighted average current discount rate was 5.4 percent at March 31, 2026 compared to 5.1 percent at December 31, 2025, with the increase due primarily to an increase in U.S. Treasury rates. The weighted average current discount rate was 5.2 percent at March 31, 2025 compared to 5.3 percent at December 31, 2024 with the decrease due primarily to a decrease in U.S. Treasury rates.

Actual variances from expected experience during the first three months of 2026 were due primarily to higher than expected group long-term care policy terminations and higher than expected incidence in our Closed Block long-term care product line. Also impacting actual variances from expected experience during the first three months of 2026 as well as the first three months of 2025 was lower than expected mortality in the Unum US group life and accidental death and dismemberment product line and higher than expected claim resolutions driven by recoveries in the Unum US group disability product line. For the first three months of 2025, actual variances from expected experience were also impacted by higher than expected mortality experience in the Closed Block individual disability product line.

For the three months ended March 31, 2026 and 2025, there were certain cohorts within the Closed Block segment, related to our long-term care product line, for which net premiums exceeded gross premiums, which resulted in a $49.1 million reduction to income before income tax for the three months ended March 31, 2026 and had an immaterial impact for the three months ended March 31, 2025. There were also certain cohorts within the Colonial Life segment, related to our cancer and critical illness product line, and within the Unum US segment, related to our individual disability product line for which net premiums exceeded gross premiums which had an immaterial impact to income before income tax for the three months ended March 31, 2026 and 2025. There were no other product lines with cohorts for which net premiums exceeded gross premiums for the three months ended March 31, 2026 and 2025.
The following table presents balances as well as the changes in the liability for future policy benefits for traditional long duration products.
Consolidated
March 31
20262025
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year$14,416.5$13,930.6
Beginning balance at original discount rate14,393.0 14,266.9 
Effect of changes in cash flow assumptions— — 
Effect of actual variances from expected experience(235.0)(183.2)
Adjusted beginning of year balance14,158.014,083.7
Issuances529.8502.2
Interest accretion162.5163.2
Net premiums collected(455.3)(435.4)
Foreign currency(12.7)21.2
Ending balance at original discount rate14,382.314,334.9
Effect of change in discount rate assumptions(189.0)(181.4)
Balance, end of period$14,193.3$14,153.5
Present Value of Expected Future Policy Benefits
Balance, beginning of year$50,683.1$48,920.1
Beginning balance at original discount rate51,638.5 50,778.2 
Effect of changes in cash flow assumptions— — 
Effect of actual variances from expected experience(174.4)(289.0)
Adjusted beginning of year balance51,464.150,489.2
Issuances1
1,300.71,272.5
Interest accretion582.5572.7
Benefit payments(1,641.1)(1,618.7)
Foreign currency(63.9)103.6
Ending balance at original discount rate51,642.350,819.3
Effect of change in discount rate assumptions(1,865.4)(1,422.9)
Balance, end of period$49,776.9$49,396.4
Net liability for future policy benefits$35,583.6$35,242.9
Other2
1,528.9 1,580.0 
Total liability for future policy benefits37,112.5 36,822.9 
Less: Reinsurance recoverable related to future policy benefits10,040.1 6,888.2 
Net liability for future policy benefits, after reinsurance recoverable$27,072.4$29,934.7
1Issuances include new policy issuances for most product lines. For our Unum US group disability, Unum US group life and AD&D and Closed Block - All Other product lines and certain of our Unum International product lines, this line represents new claim incurrals.
2Other primarily relates to our Closed Block - All Other product line.
The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products presented in the rollforward activity above.

Consolidated
March 31
20262025
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$2,742.8$2,592.1
Interest accretion$420.0$409.5

Consolidated
March 31
20262025
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$101,887.4 $103,072.4 
Expected future gross premiums$39,799.3 $39,765.5 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$26,452.4 $26,189.2 
Weighted average interest rate:
Interest accretion rate5.0 %4.9 %
Current discount rate5.4 %5.2 %
Weighted average duration of the liability11.1 years11.4 years
Unum US Segment

The following tables present the balances and changes in the reserves for future policy benefits for traditional long duration products in the Unum US segment.
March 31, 2026
Group DisabilityGroup Life and AD&DVoluntary Benefits
Individual Disability
Total Unum US
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year $—$—$1,385.5$1,236.5$2,622.0
Beginning balance at original discount rate——1,447.31,232.52,679.8
Effect of changes in cash flow assumptions—————
Effect of actual variances from expected experience——(39.7)(6.3)(46.0)
Adjusted beginning of year balance——1,407.61,226.22,633.8
Issuances——292.451.4343.8
Interest accretion——13.513.126.6
Net premiums collected——(66.7)(48.7)(115.4)
Ending balance at original discount rate——1,646.81,242.02,888.8
Effect of change in discount rate assumptions——(78.1)(11.3)(89.4)
Balance, end of period$—$—$1,568.7$1,230.7$2,799.4
Present Value of Expected Future Policy Benefits
Balance, beginning of year$4,588.1$801.6$2,536.9$3,140.7$11,067.3
Beginning balance at original discount rate4,656.9807.52,751.13,150.411,365.9
Effect of changes in cash flow assumptions—————
Effect of actual variances from expected experience(16.0)(21.9)(40.9)2.9(75.9)
Adjusted beginning of year balance4,640.9785.62,710.23,153.311,290.0
Issuances1
406.1194.2303.552.9956.7
Interest accretion38.64.528.936.5108.5
Benefit payments(460.1)(195.9)(84.1)(75.5)(815.6)
Ending balance at original discount rate4,625.5788.42,958.53,167.211,539.6
Effect of change in discount rate assumptions(105.5)(10.1)(254.7)(58.3)(428.6)
Balance, end of period$4,520.0$778.3$2,703.8$3,108.9$11,111.0
Net liability for future policy benefits$4,520.0$778.3$1,135.1$1,878.2$8,311.6
Other0.10.94.626.632.2
Total liability for future policy benefits4,520.1779.21,139.71,904.88,343.8
Less: Reinsurance recoverable related to future policy benefits23.87.313.0374.5418.6
Net liability for future policy benefits, after reinsurance recoverable$4,496.3$771.9$1,126.7$1,530.3$7,925.2
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.
March 31, 2025
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Total Unum US
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year$—$—$1,240.2$1,202.5$2,442.7
Beginning balance at original discount rate——1,335.31,230.72,566.0
Effect of changes in cash flow assumptions—————
Effect of actual variances from expected experience——(55.1)(48.0)(103.1)
Adjusted beginning of year balance——1,280.21,182.72,462.9
Issuances——250.793.4344.1
Interest accretion——12.413.025.4
Net premiums collected——(58.2)(47.1)(105.3)
Ending balance at original discount rate——1,485.11,242.02,727.1
Effect of change in discount rate assumptions——(78.6)(14.9)(93.5)
Balance, end of period$—$—$1,406.5$1,227.1$2,633.6
Present Value of Expected Future Policy Benefits
Balance, beginning of year $4,735.8$835.2$2,362.5$3,096.5$11,030.0
Beginning balance at original discount rate4,907.5852.62,614.63,191.111,565.8
Effect of changes in cash flow assumptions—————
Effect of actual variances from expected experience(45.3)(20.9)(58.1)(54.5)(178.8)
Adjusted beginning of year balance4,862.2831.72,556.53,136.611,387.0
Issuances1
410.6203.6260.895.7970.7
Interest accretion42.14.827.737.0111.6
Benefit payments(452.4)(220.9)(74.2)(74.5)(822.0)
Ending balance at original discount rate4,862.5819.22,770.83,194.811,647.3
Effect of change in discount rate assumptions(133.9)(13.2)(229.2)(55.9)(432.2)
Balance, end of period$4,728.6$806.0$2,541.6$3,138.9$11,215.1
Net liability for future policy benefits$4,728.6$806.0$1,135.1$1,911.8$8,581.5
Other0.20.82.825.829.6
Total liability for future policy benefits4,728.8806.81,137.91,937.68,611.1
Less: Reinsurance recoverable related to future policy benefits25.56.213.373.4118.4
Net liability for future policy benefits, after reinsurance recoverable$4,703.3$800.6$1,124.6$1,864.2$8,492.7
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.
The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Unum US segment presented in the rollforward activity above.

March 31, 2026
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Total Unum US
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$814.6$556.5$240.4$174.5$1,786.0
Interest accretion$38.6$4.5$15.4$23.4$81.9

March 31, 2025
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Total Unum US
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$779.6$520.3$219.9$170.8$1,690.6
Interest accretion$42.1$4.8$15.3$24.0$86.2

March 31, 2026
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Total Unum US
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$5,571.5 $891.3 $6,188.6 $5,095.2 $17,746.6 
Expected future gross premiums$— $— $6,887.3 $5,812.4 $12,699.7 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$— $— $4,404.1 $4,191.8 $8,595.9 
Weighted average interest rate:
Interest accretion rate4.3 %2.4 %5.0 %5.2 %4.4 %
Current discount rate4.7 %2.7 %5.7 %5.2 %4.7 %
Weighted average duration of the liability3.9 years2.3 years18.2 years9.4 years7.0 years
March 31, 2025
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Total Unum US
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$5,862.0 $930.0 $5,868.6 $5,138.4 $17,799.0 
Expected future gross premiums$— $— $6,325.6 $5,812.6 $12,138.2 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$— $— $4,121.9 $4,181.3 $8,303.2 
Weighted average interest rate:
Interest accretion rate4.2 %2.4 %5.0 %5.1 %4.3 %
Current discount rate4.7 %2.7 %5.5 %5.1 %4.7 %
Weighted average duration of the liability4.1 years2.5 years18.4 years9.5 years7.1 years
Unum International Segment

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Unum International segment.

March 31
20262025
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year$352.8$276.1
Beginning balance at original discount rate378.0 314.2 
Effect of changes in cash flow assumptions— — 
Effect of actual variances from expected experience(1.4)1.1 
Adjusted beginning of year balance376.6315.3
Issuances11.48.3
Interest accretion3.73.0
Net premiums collected(9.4)(7.8)
Foreign currency(12.7)21.2
Ending balance at original discount rate369.6340.0
Effect of change in discount rate assumptions(41.5)(37.5)
Balance, end of period$328.1$302.5
Present Value of Expected Future Policy Benefits
Balance, beginning of year$2,699.0$2,391.6
Beginning balance at original discount rate2,923.4 2,641.5 
Effect of changes in cash flow assumptions— — 
Effect of actual variances from expected experience(3.7)(7.3)
Adjusted beginning of year balance2,919.72,634.2
Issuances1
138.4117.6
Interest accretion19.917.5
Benefit payments(158.3)(138.9)
Foreign currency(63.9)103.6
Ending balance at original discount rate2,855.82,734.0
Effect of change in discount rate assumptions(337.4)(266.5)
Balance, end of period$2,518.4$2,467.5
Net liability for future policy benefits$2,190.3$2,165.0
Other49.5 45.8 
Total liability for future policy benefits2,239.8 2,210.8 
Less: Reinsurance recoverable related to future policy benefits71.4 68.7 
Net liability for future policy benefits, after reinsurance recoverable$2,168.4$2,142.1
1Issuances for Unum International primarily represents new claim incurrals.
The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Unum International segment presented in the rollforward activity above.
March 31
20262025
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$287.3$241.3
Interest accretion$16.2$14.5

March 31
20262025
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$4,627.9 $4,431.6 
Expected future gross premiums$1,631.1 $1,419.2 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$1,011.5 $895.9 
Weighted average interest rate:
Interest accretion rate4.2 %4.1 %
Current discount rate5.5 %5.2 %
Weighted average duration of the liability8.7 years8.9 years
Colonial Life Segment

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Colonial Life segment.
March 31
20262025
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year$3,709.0$3,553.3
Beginning balance at original discount rate3,850.9 3,793.8 
Effect of changes in cash flow assumptions— — 
Effect of actual variances from expected experience(13.5)(11.3)
Adjusted beginning of year balance3,837.43,782.5
Issuances174.6149.8
Interest accretion37.136.8
Net premiums collected(168.8)(165.2)
Ending balance at original discount rate3,880.33,803.9
Effect of change in discount rate assumptions(182.4)(198.8)
Balance, end of period$3,697.9$3,605.1
Present Value of Expected Future Policy Benefits
Balance, beginning of year$5,710.4$5,434.9
Beginning balance at original discount rate6,179.4 6,026.2 
Effect of changes in cash flow assumptions— — 
Effect of actual variances from expected experience(25.8)(20.0)
Adjusted beginning of year balance6,153.66,006.2
Issuances182.7157.3
Interest accretion61.960.5
Benefit payments(170.0)(168.1)
Ending balance at original discount rate6,228.26,055.9
Effect of change in discount rate assumptions(546.1)(531.4)
Balance, end of period$5,682.1$5,524.5
Net liability for future policy benefits$1,984.2$1,919.4
Other29.3 24.7 
Total liability for future policy benefits2,013.5 1,944.1 
Less: Reinsurance recoverable related to future policy benefits1.5 1.0 
Net liability for future policy benefits, after reinsurance recoverable$2,012.0$1,943.1
The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Colonial Life segment presented in the rollforward activity above.

March 31
20262025
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$457.1$442.0
Interest accretion$24.8$23.7

March 31
20262025
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$11,231.7 $10,537.5 
Expected future gross premiums$13,374.6 $12,748.0 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$9,425.7 $9,110.3 
Weighted average interest rate:
Interest accretion rate4.4 %4.4 %
Current discount rate5.5 %5.3 %
Weighted average duration of the liability17.6 years17.3 years
Closed Block Segment

The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Closed Block segment.
March 31, 2026
Long-term CareAll OtherTotal Closed Block
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year $7,732.7$—$7,732.7
Beginning balance at original discount rate7,484.3—7,484.3
Effect of changes in cash flow assumptions———
Effect of actual variances from expected experience(174.1)—(174.1)
Adjusted beginning of year balance7,310.2—7,310.2
Interest accretion95.1—95.1
Net premiums collected(161.7)—(161.7)
Ending balance at original discount rate7,243.6—7,243.6
Effect of change in discount rate assumptions124.3—124.3
Balance, end of period$7,367.9$—$7,367.9
Present Value of Expected Future Policy Benefits
Balance, beginning of year $24,420.6$6,785.8$31,206.4
Beginning balance at original discount rate24,113.67,056.231,169.8
Effect of changes in cash flow assumptions———
Effect of actual variances from expected experience(64.1)(4.9)(69.0)
Adjusted beginning of year balance24,049.57,051.331,100.8
Issuances1
—22.922.9
Interest accretion314.577.7392.2
Benefit payments(283.0)(214.2)(497.2)
Ending balance at original discount rate24,081.06,937.731,018.7
Effect of change in discount rate assumptions(192.3)(361.0)(553.3)
Balance, end of period$23,888.7$6,576.7$30,465.4
Net liability for future policy benefits$16,520.8$6,576.7$23,097.5
Other2
10.21,407.71,417.9
Total liability for future policy benefits16,531.07,984.424,515.4
Less: Reinsurance recoverable related to future policy benefits3,293.46,255.29,548.6
Net liability for future policy benefits, after reinsurance recoverable$13,237.6$1,729.2$14,966.8
1Issuances for Closed Block - All Other represents new claim incurrals.
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.
March 31, 2025
Long-term CareAll OtherTotal Closed Block
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year $7,658.5$—$7,658.5
Beginning balance at original discount rate7,592.9—7,592.9
Effect of changes in cash flow assumptions———
Effect of actual variances from expected experience(69.9)—(69.9)
Adjusted beginning of year balance7,523.0—7,523.0
Interest accretion98.0—98.0
Net premiums collected(157.1)—(157.1)
Ending balance at original discount rate7,463.9—7,463.9
Effect of change in discount rate assumptions148.4—148.4
Balance, end of period$7,612.3$—$7,612.3
Present Value of Expected Future Policy Benefits
Balance, beginning of year$22,925.2$7,138.4$30,063.6
Beginning balance at original discount rate22,953.77,591.030,544.7
Effect of changes in cash flow assumptions———
Effect of actual variances from expected experience(63.0)(19.9)(82.9)
Adjusted beginning of year balance22,890.77,571.130,461.8
Issuances1
—26.926.9
Interest accretion299.683.5383.1
Benefit payments(254.3)(235.4)(489.7)
Ending balance at original discount rate22,936.07,446.130,382.1
Effect of change in discount rate assumptions176.9(369.7)(192.8)
Balance, end of period$23,112.9$7,076.4$30,189.3
Net liability for future policy benefits$15,500.6$7,076.4$22,577.0
Other2
0.21,479.71,479.9
Total liability for future policy benefits15,500.88,556.124,056.9
Less: Reinsurance recoverable related to future policy benefits3.76,696.46,700.1
Net liability for future policy benefits, after reinsurance recoverable$15,497.1$1,859.7$17,356.8
1Issuances for Closed Block - All Other represents new claim incurrals.
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.
The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Closed Block segment presented in the rollforward activity above.

March 31, 2026
Long-term CareAll OtherTotal Closed Block
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$176.9$35.5$212.4
Interest accretion$219.4$77.7$297.1

March 31, 2025
Long-term CareAll OtherTotal Closed Block
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$176.2$42.0$218.2
Interest accretion$201.6 $83.5$285.1

March 31, 2026
Long-term CareAll OtherTotal Closed Block
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$58,230.7 $10,050.5$68,281.2 
Expected future gross premiums$12,093.9 $—$12,093.9 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$7,419.3 $—$7,419.3 
Weighted average interest rate:
Interest accretion rate5.6 %4.6 %5.3 %
Current discount rate5.7%5.3 %5.6 %
Weighted average duration of the liability14.4 years7.1 years12.2 years
March 31, 2025
Long-term CareAll OtherTotal Closed Block
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$59,439.9 $10,864.4$70,304.3 
Expected future gross premiums$13,460.1 $—$13,460.1 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$7,879.8 $—$7,879.8 
Weighted average interest rate:
Interest accretion rate5.6 %4.6 %5.3 %
Current discount rate5.5 %5.2 %5.4 %
Weighted average duration of the liability15.5 years7.2 years12.8 years
Reconciliation

A reconciliation of the liability for future policy benefits reflected in the preceding rollforwards to the related liability balances in the consolidated balance sheets are as follows:

March 31
20262025
(in millions of dollars)
Liability for future policy benefits
Unum US1
$8,343.8 $8,611.1 
Unum International1
2,239.8 2,210.8 
Colonial Life2,013.5 1,944.1 
Closed Block1
24,515.4 24,056.9 
Other products1
188.0 207.8 
Total liability for future policy benefits$37,300.5 $37,030.7 

1Unum US excludes the dental and vision product line and medical stop-loss products, Unum International excludes certain products in our supplemental product line and Closed Block excludes our participating fund account, which represents policies issued by one of our subsidiaries prior to its conversion from a mutual stock life insurance company. The liabilities associated with these products are included within Other products.
Policyholders' account balances primarily include universal life, corporate-owned life insurance, and certain funding agreements. Policyholders' account balances reflect policyholder deposits and interest credited less cost of insurance, administration expenses, surrender charges, and withdrawals.

The following table presents the balances and changes in the policyholders' account balances:

March 31, 2026
Unum US - Voluntary BenefitsColonial LifeClosed Block - All Other Total
(in millions of dollars, except weighted average data)
Balance, beginning of year    $548.4 $845.2 $4,073.4 $5,467.0 
Premiums received11.4 18.3 5.0 34.7 
Policy charges1
(13.1)(17.1)(29.0)(59.2)
Surrenders and withdrawals(11.6)(10.0)(3.6)(25.2)
Benefit payments(1.4)(2.2)(54.2)(57.8)
Interest credited4.8 8.4 83.7 96.9 
Other1.7 (0.3)0.8 2.2 
Balance, end of period540.2 842.3 4,076.1 5,458.6 
Reserves in excess of account balance118.8 13.4 38.7 170.9 
Total policyholders' account balances659.0 855.7 4,114.8 5,629.5 
Less: Reinsurance recoverable related to policyholders' account balances0.7 —4,114.84,115.5
Net policyholders' account balances, after reinsurance recoverable$658.3 $855.7 $— $1,514.0 
Weighted average crediting rate3.6%4.1%8.6%7.3%
Net amount at risk2
$3,635.6 $7,546.5$1,608.0$12,790.1 
Cash surrender value $530.7 $824.1$4,042.5$5,397.3 
1Contracts included in the policyholders' account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.

A reconciliation of policyholders' account balances reflected in the preceding rollforward to the related liability balances in the consolidated balance sheets is as follows:

March 31
2026
(in millions of dollars)
Policyholders' account balances
Unum US
$659.0
Colonial Life855.7
Closed Block
4,114.8
Funding agreements
106.5
Total policyholders' account balances$5,736.0 
March 31, 2025
Unum US - Voluntary BenefitsColonial LifeClosed Block - All OtherTotal
(in millions of dollars, except weighted average data)
Balance, beginning of year    $568.8$849.0 $4,052.2 $5,470.0 
Premiums received12.919.4 7.9 40.2 
Policy charges1
(13.9)(17.6)(28.4)(59.9)
Surrenders and withdrawals(8.9)(10.0)(4.3)(23.2)
Benefit payments(1.6)(2.2)(65.4)(69.2)
Interest credited5.18.5 82.0 95.6 
Other2.5(0.1)0.1 2.5 
Balance, end of period564.9 847.0 4,044.1 5,456.0 
Reserves in excess of account balance109.213.841.8164.8 
Total policyholders' account balances674.1 860.8 4,085.9 5,620.8 
Less: Reinsurance recoverable related to policyholders' account balances0.80.14,085.94,086.8
Net policyholders' account balances, after reinsurance recoverable$673.3$860.7$—$1,534.0
Weighted average crediting rate3.7%4.1%8.4%7.2%
Net amount at risk2
$4,040.4$8,057.8$1,701.8$13,800.0 
Cash surrender value $554.9$821.1$4,017.0$5,393.0 
1Contracts included in the policyholders' account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.
The balance of the account values by range of guaranteed minimum crediting rates and the related range of difference, in basis points, between rates being credited to policyholders' and the respective guaranteed minimums is as follows.

March 31, 2026
Range of Guaranteed Minimum Crediting RateAt Guaranteed Minimum1 Basis Point - 50 Basis Points Above51 Basis Points - 150 Basis Points AboveGreater than 150 Basis Points AboveTotal
(in millions of dollars)
Unum US - Voluntary Benefits
3.00% - 3.99%
$83.3$—$—$—$83.3
4.00% - 4.99%
228.0201.2——429.2
5.00% - 6.00%
27.7———27.7
339.0201.2——540.2
Colonial Life
4.00% - 5.00%
835.96.4——842.3
Closed Block - All Other
3.00% - 5.99%
1,401.728.96.5—1,437.1
6.00% - 8.99%
24.7———24.7
9.00% - 11.99%
2,390.1———2,390.1
12.00% - 15.00%
224.2———224.2
4,040.728.96.5—4,076.1
Total$5,215.6$236.5$6.5$—$5,458.6
March 31, 2025
Range of Guaranteed Minimum Crediting RateAt Guaranteed Minimum1 Basis Point - 50 Basis Points Above51 Basis Points - 150 Basis Points AboveGreater than 150 Basis Points AboveTotal
(in millions of dollars)
Unum US - Voluntary Benefits
3.00% - 3.99%
$87.9$—$—$—$87.9
4.00% - 4.99%
243.6203.0——446.6
5.00% - 6.00%
30.4———30.4
361.9203.0——564.9
Colonial Life
4.00% - 5.00%
840.76.3——847.0
Closed Block - All Other
3.00% - 5.99%
1,448.948.26.9— 1,504.0
6.00% - 8.99%
26.3——— 26.3
9.00% - 11.99%
2,306.7——— 2,306.7
12.00% - 15.00%
207.1——— 207.1
3,989.048.26.9—4,044.1
Total$5,191.6$257.5$6.9$—$5,456.0
Deferred Policy Acquisition Costs by Segment
The following tables display the changes in deferred acquisition costs throughout the period:

March 31, 2026
Unum USUnum InternationalColonial LifeTotal
(in millions of dollars)
Balance, beginning of year$1,208.7$72.1$1,639.5$2,920.3
Capitalization91.69.289.8190.6
Amortization expense(68.7)(3.4)(62.1)(134.2)
Foreign currency—(2.3)—(2.3)
Balance, end of period$1,231.6$75.6$1,667.2$2,974.4

March 31, 2025
Unum USUnum InternationalColonial LifeTotal
(in millions of dollars)
Balance, beginning of year$1,260.6$53.0$1,529.2$2,842.8
Capitalization84.75.382.6172.6
Amortization expense(65.2)(2.5)(57.7)(125.4)
Foreign currency—3.2—3.2
Balance, end of period$1,280.1$59.0$1,554.1$2,893.2

March 31, 2026
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Dental and Vision
Total Unum US
(in millions of dollars)
Balance, beginning of year$63.6$57.6$622.8$451.6$13.1$1,208.7
Capitalization16.312.334.025.43.691.6
Amortization expense (13.9)(8.7)(28.8)(13.6)(3.7)(68.7)
Balance, end of period$66.0$61.2$628.0$463.4$13.0$1,231.6

March 31, 2025
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Dental and Vision
Total Unum US
(in millions of dollars)
Balance, beginning of year$61.1$51.1$614.3$521.2$12.9$1,260.6
Capitalization16.1 11.632.221.03.884.7
Amortization expense(10.4)(6.1)(29.8)(15.4)(3.5)(65.2)
Balance, end of period$66.8$56.6$616.7$526.8$13.2$1,280.1
v3.26.1
Segment Information
 3 Months Ended
Mar. 31, 2026
Segment Reporting [Abstract]  
Segment Information
We have three core operating segments: Unum US, Unum International, and Colonial Life. Our other operating segments are Closed Block and Corporate.

Segment information is shown below. Certain prior year amounts were adjusted to conform to current year presentation. See below for more information regarding this update.
Three Months Ended March 31
20262025
(in millions of dollars)
Premium Income
Unum US
Group Disability
Group Long-term Disability$498.8 $504.5 
Group Short-term Disability310.7 278.3 
Group Life and Accidental Death & Dismemberment
Group Life495.4 466.2 
Accidental Death & Dismemberment53.0 48.2 
Supplemental and Voluntary
Voluntary Benefits253.8 234.1 
Individual Disability146.5 168.7 
Dental and Vision82.3 80.9 
1,840.5 1,780.9 
Unum International
Unum UK
Group Long-term Disability104.8 100.2 
Group Life77.0 61.6 
Supplemental50.3 41.9 
Unum Poland54.6 43.0 
286.7 246.7 
Colonial Life
Accident, Sickness, and Disability252.8 247.1 
Life128.3 119.9 
Cancer and Critical Illness91.6 90.3 
472.7 457.3 
Closed Block
Long-term Care159.4 176.2 
All Other34.7 41.8 
194.1 218.0 
Total Premium Income$2,794.0 $2,702.9 
Three Months Ended March 31, 2026
Unum USUnum InternationalColonial LifeClosed BlockCorporateTotal
(in millions of dollars)
Premium Income$1,840.5 $286.7 $472.7 $194.1 $— $2,794.0 
Net Investment Income158.3 29.6 46.8 229.1 19.6 483.4 
Other Income66.8 3.3 0.7 11.3 0.7 82.8 
Segment Adjusted Operating Revenue
2,065.6 319.6 520.2 434.5 20.3 3,360.2 
Policy Benefits
1,127.1 206.3 229.7 392.7 — 1,955.8 
Policy Benefits - Remeasurement Loss (Gain)
(31.8)(2.8)(12.4)95.2 — 48.2 
Commissions219.4 31.0 102.9 15.2 — 368.5 
Interest and Debt Expense— — — — 53.1 53.1 
Deferral of Acquisition Costs(91.6)(9.2)(89.8)— — (190.6)
Amortization of Deferred Acquisition Costs68.7 3.4 62.1 — — 134.2 
Other Segment Items1
435.9 60.0 99.9 76.7 10.8 683.3 
Benefits and Expenses
1,727.7 288.7 392.4 579.8 63.9 3,052.5 
Segment Adjusted Operating Income (Loss)
$337.9 $30.9 $127.8 $(145.3)$(43.6)$307.7 
1For each reportable segment, other segment items includes compensation, other personnel expenses, taxes, licenses and fees, depreciation, intangible asset amortization and other expenses. Depreciation and intangible asset amortization during the three months ended March 31, 2026 was $21.7 million, $5.5 million, $4.4 million, $1.6 million, and $0.2 million for our Unum US, Unum International, Colonial Life, Closed Block and Corporate segments, respectively.
Three Months Ended March 31, 2025
Unum USUnum InternationalColonial LifeClosed BlockCorporateTotal
(in millions of dollars)
Premium Income$1,780.9 $246.7 $457.3 $218.0 $— $2,702.9 
Net Investment Income148.9 28.5 42.2 269.7 23.9 513.2 
Other Income71.9 0.1 0.4 9.9 — 82.3 
Segment Adjusted Operating Revenue
2,001.7 275.3 499.9 497.6 23.9 3,298.4 
Policy Benefits
1,138.6 172.9 226.6 422.2 — 1,960.3 
Policy Benefits - Remeasurement Loss (Gain)
(75.4)(8.8)(8.5)3.4 — (89.3)
Commissions205.6 22.4 97.3 17.9 — 343.2 
Interest and Debt Expense— — — — 52.0 52.0 
Deferral of Acquisition Costs(84.7)(5.3)(82.6)— — (172.6)
Amortization of Deferred Acquisition Costs65.2 2.5 57.7 — — 125.4 
Other Segment Items1
423.3 52.9 93.7 46.1 13.0 629.0 
Benefits and Expenses
1,672.6 236.6 384.2 489.6 65.0 2,848.0 
Segment Adjusted Operating Income (Loss)
$329.1 $38.7 $115.7 $8.0 $(41.1)$450.4 
1For each reportable segment, other segment items includes compensation, other personnel expenses, taxes, licenses and fees, depreciation, intangible asset amortization and other expenses. Depreciation and intangible asset amortization during the three months ended March 31, 2025 was $21.3 million, $4.7 million, $4.2 million, $1.5 million, and $0.1 million for our Unum US, Unum International, Colonial Life, Closed Block and Corporate segments, respectively.

March 31December 31
20262025
(in millions of dollars)
Assets
Unum US$14,500.9 $14,635.3 
Unum International3,661.9 3,648.0 
Colonial Life5,332.4 5,289.9 
Closed Block32,503.2 33,887.8 
Corporate6,715.9 6,058.4 
Total Assets$62,714.3 $63,519.4 

We report goodwill in our Unum US, Unum International, and Colonial Life segments, which are the segments expected to benefit from the originating business combinations. At March 31, 2026 and December 31, 2025 goodwill was $353.0 million and $353.9 million, respectively, with $281.2 million attributable to Unum US in both periods, $44.1 million and $45.0 million, respectively, attributable to Unum International, and $27.7 million attributable to Colonial Life in both periods.

We measure and analyze our segment performance on the basis of "segment adjusted operating revenue" and "segment adjusted operating income" or "segment adjusted operating loss", which differ from total revenue and income before income tax as presented in our consolidated statements of income due to the exclusion of investment gains and losses, reserve assumption updates, and certain other items. The excluded items impacting the periods presented herein are specified in the reconciliations below. We believe segment adjusted operating revenue and segment adjusted operating income or loss are better performance
measures and better indicators of the revenue and profitability and underlying trends in our business. These performance measures are in accordance with GAAP guidance for segment reporting, but they should not be viewed as a substitute for total revenue, income before income tax, or net income. 

Investment gains or losses primarily include realized investment gains or losses, expected investment credit losses, impairment losses, and gains or losses on derivatives. Investment gains or losses depend on market conditions and do not necessarily relate to decisions regarding the underlying business of our segments. Our investment focus is on investment income to support our insurance liabilities as opposed to the generation of investment gains or losses. Although we may experience investment gains or losses which will affect future earnings levels, a long-term focus is necessary to maintain profitability over the life of the business since our underlying business is long-term in nature, and we need to earn the interest rates assumed in calculating our liabilities.

We have completed reinsurance transactions to exit significant portions of our Closed Block businesses and we are no longer accepting new enrollments on existing group long-term care policies. As a result of these actions and the continued run-off of the Closed Block business, we determined that it is no longer necessary to adjust segment adjusted operating revenue or segment adjusted operating income or loss to exclude the amortization of the deferred gain on reinsurance and it is no longer necessary to adjust segment adjusted operating income or loss to exclude the amortization of the cost of reinsurance, the amortization of the deferred gain on reinsurance or the impact of non-contemporaneous reinsurance, because the majority of these items are included in Closed Block segment results. Prior period financial information has been adjusted to conform to this updated presentation.

Cash flow assumptions used to calculate our liability for future policy benefits are reviewed at least annually and updated, as needed, with the resulting impact reflected in net income. While the effects of these assumption updates are recorded in the reporting period in which the review is completed, these updates reflect experience emergence and changes to expectations spanning multiple periods. We believe that by excluding the impact of reserve assumption updates we are providing a more comparable and consistent view of our quarterly results.

We may at other times exclude certain other items from our discussion of financial ratios and metrics in order to enhance the understanding and comparability of our operational performance and the underlying fundamentals, but this exclusion is not an indication that similar items may not recur and does not replace net income or net loss as a measure of our overall profitability.
A reconciliation of total revenue to "segment adjusted operating revenue" and income before income tax to "segment adjusted operating income" is shown below.

Three Months Ended March 31
20262025
(in millions of dollars)
Total Revenue$3,355.2 $3,091.6 
Excluding:
Net Investment Loss(5.0)(206.8)
Segment Adjusted Operating Revenue
$3,360.2 $3,298.4 
Income Before Income Tax$302.7 $243.6 
Excluding:
Net Investment Loss
Net Investment Loss Related to the Fortitude Re Reinsurance Transaction— (175.9)
Net Investment Loss, Other(5.0)(30.9)
Total Net Investment Loss(5.0)(206.8)
Segment Adjusted Operating Income$307.7 $450.4 
v3.26.1
Employee Benefit Plans
 3 Months Ended
Mar. 31, 2026
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Disclosure
Defined Benefit Pension and Other Postretirement Benefit (OPEB) Plans

We sponsor several defined benefit pension and OPEB plans for our employees, including non-qualified pension plans. The U.S. qualified and non-qualified defined benefit pension plans comprise the majority of our total benefit obligation and benefit cost. We maintain a separate defined benefit plan for eligible employees in our U.K. operation. The U.S. defined benefit pension plans were frozen and closed to new entrants on December 31, 2013, the OPEB plan was frozen and closed to new entrants on December 31, 2012, and the U.K. plan was frozen and closed to new entrants on December 31, 2002.

The following table provides the components of the net periodic benefit cost for the defined benefit pension and OPEB plans.
Three Months Ended March 31
 Pension Benefits  
 U.S. PlansU.K. PlanOPEB
 202620252026202520262025
(in millions of dollars)
Service Cost$1.8 $2.4 $— $— $— $— 
Interest Cost16.4 21.4 2.2 2.1 0.9 1.0 
Expected Return on Plan Assets(16.7)(21.8)(2.5)(2.2)(0.1)(0.1)
Amortization of:
   Net Actuarial Loss (Gain)
2.2 3.7 0.7 0.7 (0.2)(0.3)
   Prior Service Credit— — — — (0.1)(0.1)
Total Net Periodic Benefit Cost
$3.7 $5.7 $0.4 $0.6 $0.5 $0.5 

The service cost component of net periodic pension and postretirement benefit cost is included as a component of compensation expense in our consolidated statements of income. All other components of net periodic pension and postretirement benefit cost are included in other expenses.
v3.26.1
Stockholders' Equity and Earnings Per Common Share
 3 Months Ended
Mar. 31, 2026
Stockholders' Equity and Earnings Per Common Share [Abstract]  
Earnings Per Share Disclosure
Earnings Per Common Share

Net income per common share is determined as follows:
 Three Months Ended March 31
 20262025
 (in millions of dollars, except share data)
Numerator
Net Income$232.0 $189.1 
Denominator (000s)
Weighted Average Common Shares - Basic164,073.9 178,291.5 
Dilution for Assumed Exercises of Nonvested Stock Awards325.6 590.9 
Weighted Average Common Shares - Assuming Dilution164,399.5 178,882.4 
Net Income Per Common Share
Basic$1.41 $1.06 
Assuming Dilution$1.41 $1.06 

We compute basic earnings per share by dividing net income by the weighted average number of common shares outstanding for the period. In computing earnings per share assuming dilution, we include potential common shares that are dilutive (those that reduce earnings per share). We use the treasury stock method to account for the effect of nonvested restricted stock units and nonvested performance share units on the computation of diluted earnings per share. Under this method, the potential common shares from nonvested restricted stock units and nonvested performance share units will each have a dilutive effect, as individually measured, when the average market price of Unum Group common stock during the period exceeds the grant price of the nonvested restricted stock units and nonvested performance share units. The outstanding nonvested restricted stock units and nonvested performance share units have grant prices ranging from $40.29 to $83.04. Potential common shares not included in the computation of diluted earnings per share because the impact would be antidilutive, approximated 0.3 million for the three months ended March 31, 2026 and 2025.
Stockholders' Equity Disclosure
Common Stock

As part of our capital deployment strategy, we may repurchase shares of Unum Group's common stock, as authorized by our board of directors. The timing and amount of repurchase activity is based on market conditions and other considerations, including the level of available cash, alternative uses for cash, and our stock price.

Our board of directors has authorized the following repurchase programs:
December 2025 Authorization
February 2025 Authorization1
July 2024 Authorization2
(in millions)
Effective Date
January 1, 2026
April 1, 2025
August 1, 2024
Expiration Date
None
December 31, 2025
March 31, 2025
Authorized Repurchase Amount
$1,000.0 $1,000.0 $1,000.0 
Cost of Shares Repurchased Under Repurchase Program
398.6 800.0 706.8 
Unused and Expired
— 200.0 293.2 
Remaining Repurchase Amount at March 31, 2026
$601.4 $— $— 
1Concurrent with the announcement of the December 2025 repurchase program, we also announced the termination of the February 2025 program as of December 31, 2025, and any unused amounts under that program expired as of that date.
2Concurrent with the announcement of the February 2025 repurchase program, we also announced the termination of the July 2024 program as of March 31, 2025, and any unused amounts under that program expired as of that date.
Common stock repurchases, which are accounted for using the cost method and classified as treasury stock until otherwise retired, were as follows:
Three Months Ended March 31
20262025
(in millions)
Shares Repurchased1
5.4 3.3 
Cost of Shares Repurchased2
$402.4 $202.6 
1For the three months ended March 31, 2025, includes 0.7 million shares related to the settlement of the November 2024 accelerated share repurchase agreement (ASR) which occurred in February 2025.
2Includes $0.1 million and $0.5 million of commissions for the three months ended March 31, 2026 and 2025, respectively. Also includes $3.7 million and $2.1 million of excise taxes for the three months ended March 31, 2026 and 2025, respectively.

As a part of our share repurchase program, we periodically enter into accelerated share repurchase agreements. Under the terms of these agreements, we make a prepayment to a financial counterparty for which we receive an initial delivery of approximately 75 percent of the total Unum Group common stock to be delivered under the agreement. We simultaneously enter into a forward contract indexed to the price of Unum Group common stock, which subjects the transactions to a future price adjustment. Under the terms of the agreements, we are to receive, or be required to pay, a price adjustment based on the volume weighted average price of Unum Group common stock during the term of the agreement, less a discount. Any price adjustment payable to us is settled in shares of Unum Group common stock. Any price adjustment we would be required to pay may be settled in either cash or common stock at our option. In November 2024, we paid $321.0 million to a financial counterparty as a part of an accelerated share repurchase agreement. We received an initial delivery of 3.8 million shares of our common stock. The final price adjustment settlement, along with the delivery of the remaining shares, occurred in February 2025, resulting in the delivery to us of 0.7 million additional shares. As a result of the final settlement occurring subsequent to December 31, 2024, we recorded a decrease of $80.3 million to additional paid-in capital within stockholders' equity on our consolidated balance sheet for the value of the shares held back by the counterparty as of December 31, 2024, which was reclassified to treasury stock in the first quarter of 2025 in connection with the final settlement of the agreement

Preferred Stock

Unum Group has 25.0 million shares of preferred stock authorized with a par value of $0.10 per share. No preferred stock has been issued to date.
v3.26.1
Commitments and Contingent Liabilities
 3 Months Ended
Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]  
Commitments and Contingencies Disclosure
Commitments

See Notes 3 and 4 for further discussion on certain of our investment commitments.

Contingent Liabilities

We are a defendant in a number of litigation matters that have arisen in the normal course of business, including the matters discussed below. Further, state insurance regulatory authorities and other federal and state authorities regularly make inquiries and conduct investigations concerning our compliance with applicable insurance and other laws and regulations. Given the complexity and scope of our litigation and regulatory matters, it is not possible to predict the ultimate outcome of all pending investigations or legal proceedings or provide reasonable estimates of potential losses, except if noted in connection with specific matters.

In some of these matters, no specified amount is sought. In others, very large or indeterminate amounts, including punitive and treble damages, are asserted. There is a wide variation of pleading practice permitted in the United States courts with respect to requests for monetary damages, including some courts in which no specified amount is required and others which allow the plaintiff to state only that the amount sought is sufficient to invoke the jurisdiction of that court. Further, some jurisdictions permit plaintiffs to allege damages well in excess of reasonably possible verdicts. Based on our extensive experience and that
of others in the industry with respect to litigating or resolving claims through settlement over an extended period of time, we believe that the monetary damages asserted in a lawsuit or claim bear little relation to the merits of the case, or the likely disposition value. Therefore, the specific monetary relief sought is not stated.

Unless indicated otherwise, reserves have not been established for litigation and contingencies. An estimated loss is accrued when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated.

Claim Handling Matters

We and our insurance subsidiaries, in the ordinary course of our business, are engaged in claim litigation where disputes arise as a result of a denial or termination of benefits. Most typically these lawsuits are filed on behalf of a single claimant or policyholder, and in some of these individual actions punitive damages are sought, such as claims alleging bad faith in the handling of insurance claims. For our general claim litigation, we maintain reserves based on experience to satisfy judgments and settlements in the normal course. We expect that the ultimate liability, if any, with respect to general claim litigation, after consideration of the reserves maintained, will not be material to our consolidated financial condition. Nevertheless, given the inherent unpredictability of litigation, it is possible that an adverse outcome in certain claim litigation involving punitive damages could, from time to time, have a material adverse effect on our consolidated results of operations in a period, depending on the results of operations for the particular period.

From time to time class action allegations are pursued where the claimant or policyholder purports to represent a larger number of individuals who are similarly situated. Since each insurance claim is evaluated based on its own merits, there is rarely a single act or series of actions which can properly be addressed by a class action. Nevertheless, we monitor these cases closely and defend ourselves appropriately where these allegations are made.
v3.26.1
Other
 3 Months Ended
Mar. 31, 2026
Debt and Other Disclosures [Abstract]  
Debt
Credit Facility

In April 2026, we entered into a senior letter of credit facility pursuant to which a letter of credit may be issued in favor of Unum Limited (as beneficiary), our U.K. insurance subsidiary. The facility provides for drawings up to £50.0 million until its scheduled expiration five years after issuance of the letter of credit and no later than July 2031. The credit facility provides for borrowings at an interest rate based on the sterling overnight index average.

Borrowings under the credit facility are subject to financial covenants, negative covenants, and events of default that are customary. The credit facility includes financial covenants based on our leverage ratio and consolidated net worth as well as covenants that limit subsidiary indebtedness.

Junior Subordinated Debt Securities
During the first quarter of 2026, we purchased and retired $7.7 million aggregate principal amount of our 6.250% junior subordinated debt securities issued in 2018 and due 2058.
Allowance for Expected Credit Losses on Premiums Receivable
Allowance for Expected Credit Losses on Premiums Receivable

At March 31, 2026 and December 31, 2025, the allowance for expected credit losses on premiums receivables was $26.9 million and $26.1 million, respectively, on gross premiums receivable of $727.4 million and $579.5 million, respectively. The increase in gross premiums receivable of $147.9 million during the three months ended March 31, 2026 was driven by sales growth. The increase in the allowance for expected credit losses of $0.8 million during the three months ended March 31, 2026 was driven by an increase in the gross premiums receivable.

At March 31, 2025 and December 31, 2024, the allowance for expected credit losses on premiums receivables was $27.0 million and $26.8 million, respectively, on gross premiums receivable of $631.8 million and $584.1 million, respectively. The allowance for expected credit losses was generally consistent at March 31, 2025 compared to December 31, 2024.
Reinsurance
Closed Block Long-Term Care and Unum US Individual Disability Reinsurance Transaction

In February 2025, Unum Life Insurance Company of America (Unum America) entered into a master transaction agreement with Fortitude Reinsurance Company Ltd. (Fortitude Re) which resulted in the execution of a coinsurance agreement (reinsurance agreement) during July 2025. This reinsurance agreement reinsures a portion of our Closed Block long-term care business and a portion of our Unum US individual disability business on a coinsurance basis to Fortitude Re effective January 2025. The reinsurance agreement represented approximately 21 percent of total Closed Block long-term care future policy benefits and approximately 15 percent of Unum US individual disability future policy benefits as of December 31, 2024.

Upon closing the transaction in July 2025, we transferred to Fortitude Re $953.5 million of cash as well as fixed maturity securities with a fair value totaling $3,230.1 million and accrued investment income of $47.1 million. After consideration of the final settlement, the final ceding commission related to this transaction was $442.3 million.

As a result of this reinsurance agreement, we recognized the following:

•Net realized investment loss totaling $46.8 million during the year ended December 31, 2025.
•Reinsurance recoverable of $3,620.5 million comprised of ceded reserves of $3,315.2 million related to the Closed Block long-term care product line and $305.3 million related to the Unum US individual disability product line.
•Cost of reinsurance of $848.2 million related to the Closed Block long-term care product line and a deferred gain on reinsurance related to the Unum US individual disability product line of $145.9 million.
•Write-off of deferred acquisition costs related to the Unum US individual disability product line of $100.3 million which is included as a component of deferred gain on reinsurance.

In July 2025, immediately prior to entering into the reinsurance agreement with Fortitude Re, Unum America recaptured the aforementioned Closed Block long-term care business from Fairwind Insurance Company, an affiliated captive reinsurer, and assumed the aforementioned Unum US individual disability business from Provident Life and Accident Insurance Company, an affiliate.
v3.26.1
Insider Trading Arrangements
 3 Months Ended
Mar. 31, 2026
Trading Arrangements, by Individual  
Rule 10b5-1 Arrangement Adopted false
Non-Rule 10b5-1 Arrangement Adopted false
Rule 10b5-1 Arrangement Terminated false
Non-Rule 10b5-1 Arrangement Terminated false
v3.26.1
Basis of Presentation (Policies)
 3 Months Ended
Mar. 31, 2026
Accounting Policies [Abstract]  
Basis of Presentation The accompanying consolidated financial statements of Unum Group and its subsidiaries (the Company) have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. For further information, refer to the consolidated financial statements and footnotes included in our annual report on Form 10-K for the year ended December 31, 2025.
v3.26.1
Fair Values of Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2026
Fair Value Disclosures [Abstract]  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share
The following tables present additional information about our private equity partnerships, including commitments for additional investments which may or may not be funded:

March 31, 2026
Investment CategoryFair ValueRedemption Term / Redemption NoticeUnfunded Commitments
(in millions of dollars)(in millions of dollars)
Private Credit(a)$181.7 Not redeemable$106.3 
49.5 Quarterly / 90 days notice12.7 
Total Private Credit231.2 119.0 
Private Equity(b)625.6 Not redeemable428.4 
33.1 Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice20.4 
Total Private Equity658.7 448.8 
Real Assets(c)515.9 Not redeemable266.7 
38.3 Quarterly / 90 days notice— 
Total Real Assets554.2 266.7 
Total Partnerships$1,444.1 $834.5 

December 31, 2025
Investment CategoryFair ValueRedemption Term / Redemption NoticeUnfunded Commitments
(in millions of dollars)(in millions of dollars)
Private Credit(a)$205.9 Not redeemable$108.3 
49.9 Quarterly / 90 days notice12.7 
Total Private Credit255.8 121.0 
Private Equity(b)618.9 Not redeemable406.8 
32.5 Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice15.5
Total Private Equity651.4 422.3 
Real Assets(c)511.4 Not redeemable213.4 
37.7 Quarterly / 90 days notice— 
Total Real Assets549.1 213.4 
Total Partnerships$1,456.3 $756.7 
(a)Private Credit - The limited partnerships described in this category employ various investment strategies, generally providing direct lending or other forms of debt financing including first-lien, second-lien, mezzanine, and subordinated loans. The limited partnerships have credit exposure to corporates, physical assets, and/or financial assets within a variety of industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail) in North America and, to a lesser extent, outside of North America.  As of March 31, 2026, the estimated remaining life of the investments that do not allow for redemptions is approximately 75 percent in the next 3 years, 7 percent during the period from 3 to 5 years, and 18 percent during the period from 5 to 10 years.

(b)Private Equity - The limited partnerships described in this category employ various strategies generally investing in controlling or minority control equity positions directly in companies and/or assets across various industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail), primarily in private markets within North America and, to a lesser extent, outside of North America.  As of March 31, 2026, the estimated remaining life of the investments that do not allow for redemptions is approximately 44 percent in the next 3 years, 19 percent during the period from 3 to 5 years, 36 percent during the period from 5 to 10 years, and 1 percent during the period from 10 to 15 years.

(c)Real Assets - The limited partnerships described in this category employ various strategies, which include investing in the equity and/or debt financing of physical assets, including infrastructure (energy, power, water/wastewater, communications), transportation (including airports, ports, toll roads, aircraft, railcars) and real estate in North America, Europe, South America, and Asia.  As of March 31, 2026, the estimated remaining life of the investments that do not allow for redemptions is approximately 54 percent in the next 3 years, 23 percent during the period from 3 to 5 years, and 23 percent during the period from 5 to 10 years.
Fair Values by Fair Value Hierarchy Input level
The following tables present information about financial instruments measured at fair value on a recurring basis by fair value level, based on the observability of the inputs used:

 March 31, 2026
 Level 1Level 2Level 3NAVTotal
(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities$77.7 $467.2 $— $— $544.9 
States, Municipalities, and Political Subdivisions— 3,000.0 — — 3,000.0 
Foreign Governments— 844.9 — — 844.9 
Public Utilities690.3 4,315.1 — — 5,005.4 
Mortgage/Asset-Backed Securities1
— 1,159.2 197.7 — 1,356.9 
All Other Corporate Bonds7,152.4 15,328.1 60.4 — 22,540.9 
Redeemable Preferred Stocks— 7.8 — — 7.8 
Total Fixed Maturity Securities7,920.4 25,122.3 258.1 — 33,300.8 
Other Long-term Investments
Derivatives
Forwards— 1.7 — — 1.7 
Foreign Currency Interest Rate Swaps
— 59.0 — — 59.0 
Embedded Derivative in Modified Coinsurance Arrangement— — 14.8 — 14.8 
Total Derivatives— 60.7 14.8 — 75.5 
Perpetual Preferred and Equity Securities— 0.2 19.8 — 20.0 
Private Equity Partnerships— — — 1,444.1 1,444.1 
Total Other Long-term Investments— 60.9 34.6 1,444.1 1,539.6 
Total Financial Instrument Assets Carried at Fair Value$7,920.4 $25,183.2 $292.7 $1,444.1 $34,840.4 
Liabilities
Other Liabilities
Derivatives
Forwards$— $219.4 $— $— $219.4 
Foreign Currency Interest Rate Swaps— 41.6 — — 41.6 
Total Derivatives— 261.0 — — 261.0 
Total Financial Instrument Liabilities Carried at Fair Value$— $261.0 $— $— $261.0 
1Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types.
 December 31, 2025
 Level 1Level 2Level 3NAVTotal
(in millions of dollars)
Assets
Fixed Maturity Securities
United States Government and Government Agencies and Authorities$79.3 $465.7 $— $— $545.0 
States, Municipalities, and Political Subdivisions— 3,058.1 — — 3,058.1 
Foreign Governments— 870.3 — — 870.3 
Public Utilities223.7 4,710.2 — — 4,933.9 
Mortgage/Asset-Backed Securities1
— 1,076.2 103.1 — 1,179.3 
All Other Corporate Bonds3,656.0 18,742.2 63.9 — 22,462.1 
Redeemable Preferred Stocks— 7.9 — — 7.9 
Total Fixed Maturity Securities3,959.0 28,930.6 167.0 — 33,056.6 
Other Long-term Investments
Derivatives
Forwards— 2.4 — — 2.4 
Foreign Currency Interest Rate Swaps
— 49.5 — — 49.5 
Embedded Derivative in Modified Coinsurance Arrangement— — 17.8 — 17.8 
Total Derivatives— 51.9 17.8 — 69.7 
Perpetual Preferred and Equity Securities— 0.2 19.8 — 20.0 
Private Equity Partnerships— — — 1,456.3 1,456.3 
Total Other Long-term Investments— 52.1 37.6 1,456.3 1,546.0 
Total Financial Instrument Assets Carried at Fair Value$3,959.0 $28,982.7 $204.6 $1,456.3 $34,602.6 
Liabilities
Other Liabilities
Derivatives
Forwards$— $223.9 $— $— $223.9 
Foreign Currency Interest Rate Swaps— 45.8 — — 45.8 
Total Derivatives— 269.7 — — 269.7 
Total Financial Instrument Liabilities Carried at Fair Value$— $269.7 $— $— $269.7 
Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs
Changes in assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) are as follows:

 Three Months Ended March 31, 2026
 Fair Value Beginning of YearTotal Realized
and Unrealized
Investment Gains (Losses) in		 Sales/MaturitiesLevel 3 TransfersFair Value End of PeriodChange in Unrealized Gain (Loss) on Securities Held at the End of Period included in
 EarningsOCIPurchasesIntoOut ofOCIEarnings
(in millions of dollars)
Fixed Maturity Securities
Public Utilities$— $— $— $— $(10.0)$10.0 $— $— $— $— 
Mortgage/Asset-Backed Securities1
103.1 — 0.6 103.4 (9.5)0.1 — 197.7 0.7 — 
All Other Corporate Bonds63.9 — 0.1 — (39.0)82.8 (47.4)60.4 (0.4)— 
Total Fixed Maturity Securities167.0 — 0.7 103.4 (58.5)92.9 (47.4)258.1 0.3 — 
Perpetual Preferred and Equity Securities19.8 — — — — — — 19.8 — — 
Embedded Derivative in Modified Coinsurance Arrangement17.8 (3.0)— — — — — 14.8 — (3.0)
1Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types.
 Three Months Ended March 31, 2025
Fair Value Beginning of YearTotal Realized
and Unrealized
Investment Gains (Losses) in		Sales/MaturitiesLevel 3 TransfersFair Value End of PeriodChange in Unrealized Gain (Loss) on Securities Held at the End of Period included in
EarningsOCIPurchasesIntoOut ofOCIEarnings
(in millions of dollars)
Fixed Maturity Securities
Public Utilities$— $(1.5)$1.6 $— $(12.3)$12.2 $— $— $— $— 
Mortgage/Asset-Backed Securities1
73.5 — (0.6)4.8 (0.5)— — 77.2 (0.6)— 
All Other Corporate Bonds71.5 (6.2)(8.3)— (70.3)83.8 (38.2)32.3 (8.3)— 
Total Fixed Maturity Securities145.0 (7.7)(7.3)4.8 (83.1)96.0 (38.2)109.5 (8.9)— 
Perpetual Preferred and Equity Securities24.4 0.7 — 1.7 — — — 26.8 — 0.7 
Embedded Derivative in Modified Coinsurance Arrangement11.5 (1.9)— — — — — 9.6 — (1.9)
Quantitative Information Regarding Significant Unobservable Inputs
The table below provides quantitative information regarding the significant unobservable inputs used in Level 3 fair value measurements derived from internal models. Unobservable inputs for fixed maturity securities are weighted by the fair value of the securities. Certain securities classified as Level 3 are excluded from the table below due to limitations in our ability to obtain the underlying inputs used by external pricing sources.

March 31, 2026
Fair ValueValuation MethodUnobservable InputRange/Weighted Average
(in millions of dollars)
Fixed Maturity Securities
All Other Corporate Bonds - Private$5.7 Market Approach
Market Convention
(a)
Priced at Par Value
Perpetual Preferred and Equity Securities19.8 Market Approach
Market Convention
(a)Priced at Cost, Owner's Equity, or Most Recent Round
Embedded Derivative in Modified Coinsurance Arrangement14.8 Discounted Cash Flows
Projected Liability Cash Flows
Weighted Spread of Swap Curve
(b)
Actuarial Assumptions
(0.34)%

December 31, 2025
Fair ValueValuation MethodUnobservable InputRange/Weighted Average
(in millions of dollars)
Fixed Maturity Securities
All Other Corporate Bonds - Private$8.3 Market Approach
Market Convention
(a)
Priced at Par Value
Perpetual Preferred and Equity Securities19.8 Market ApproachMarket Convention(a)Priced at Cost, Owner's Equity, or Most Recent Round
Embedded Derivative in Modified Coinsurance Arrangement17.8 Discounted Cash Flows
Projected Liability Cash Flows
Weighted Spread of Swap Curve
(b)
Actuarial Assumptions
(0.41)%

(a)Represents a decision to price based on par value, cost, owner's equity, or the price of the most recent capital funding round when limited data is available
(b)Represents various actuarial assumptions required to derive the liability cash flows. Fair value of embedded derivative is most often driven by the change in the weighted average credit spread to the swap curve for the assets backing the hypothetical loan
Carrying Amount and Fair Value of Financial Instruments
The following tables present the carrying amounts and estimated fair values of our financial instruments not measured at fair value and indicates the level in the fair value hierarchy of the estimated fair value measurement based on the observability of the inputs used:

March 31, 2026
Estimated Fair Value
Level 1Level 2Level 3TotalCarrying Value
(in millions of dollars)
Assets
Mortgage Loans$— $1,919.3 $— $1,919.3 $2,066.3 
Policy Loans— — 3,761.7 3,761.7 3,702.9 
Other Long-term Investments
Miscellaneous Long-term Investments— 42.5 0.2 42.7 42.7 
Total Financial Instrument Assets Not Carried at Fair Value$— $1,961.8 $3,761.9 $5,723.7 $5,811.9 
Liabilities
Policyholders' Account Balances
$— $106.5 $— $106.5 $106.5 
Long-term Debt2,992.7 559.4 — 3,552.1 3,762.0 
Other Liabilities— 585.6 — 585.6 585.6 
Total Financial Instrument Liabilities Not Carried at Fair Value$2,992.7 $1,251.5 $— $4,244.2 $4,454.1 
December 31, 2025
Estimated Fair Value
Level 1Level 2Level 3TotalCarrying Value
(in millions of dollars)
Assets
Mortgage Loans$— $1,965.1 $— $1,965.1 $2,109.5 
Policy Loans— — 3,739.5 3,739.5 3,668.1 
Other Long-term Investments
Miscellaneous Long-term Investments— 40.7 0.2 40.9 40.9 
Total Financial Instrument Assets Not Carried at Fair Value$— $2,005.8 $3,739.7 $5,745.5 $5,818.5 
Liabilities
Long-term Debt$2,548.2 $1,093.2 $— $3,641.4 $3,767.6 
Other Liabilities— 644.0 — 644.0 644.0 
Total Financial Instrument Liabilities Not Carried at Fair Value$2,548.2 $1,737.2 $— $4,285.4 $4,411.6 
v3.26.1
Investments (Tables)
 3 Months Ended
Mar. 31, 2026
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Fair Values of Securities by Security Type
At March 31, 2026 and December 31, 2025, all fixed maturity securities were classified as available-for-sale. The amortized cost and fair values of securities by security type are shown as follows:

 March 31, 2026
 
Amortized
Cost, Gross of ACL1
ACL1
Gross
Unrealized
Gain		Gross
Unrealized
Loss		Fair
Value
(in millions of dollars)
United States Government and Government Agencies and Authorities $548.9 $— $13.2 $17.2 $544.9 
States, Municipalities, and Political Subdivisions3,413.2 — 61.9 475.1 3,000.0 
Foreign Governments989.4 — 14.9 159.4 844.9 
Public Utilities5,202.3 — 136.8 333.7 5,005.4 
Mortgage/Asset-Backed Securities2
1,371.9 — 7.7 22.7 1,356.9 
All Other Corporate Bonds23,997.1 — 386.3 1,842.5 22,540.9 
Redeemable Preferred Stocks8.0 — — 0.2 7.8 
Total Fixed Maturity Securities$35,530.8 $— $620.8 $2,850.8 $33,300.8 


December 31, 2025
 
Amortized
Cost, Gross of ACL1
ACL1
Gross
Unrealized
Gain		Gross
Unrealized
Loss		Fair
Value
(in millions of dollars)
United States Government and Government Agencies and Authorities$543.8 $— $17.2 $16.0 $545.0 
States, Municipalities, and Political Subdivisions3,450.7 — 73.8 466.4 3,058.1 
Foreign Governments1,008.8 — 18.8 157.3 870.3 
Public Utilities5,048.6 — 175.4 290.1 4,933.9 
Mortgage/Asset-Backed Securities2
1,187.3 — 9.3 17.3 1,179.3 
All Other Corporate Bonds23,500.0 5.9 527.5 1,559.5 22,462.1 
Redeemable Preferred Stocks8.0 — — 0.1 7.9 
Total Fixed Maturity Securities$34,747.2 $5.9 $822.0 $2,506.7 $33,056.6 

1Allowance for Credit Losses
2Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types
Distribution of the Maturity Dates for Fixed Maturity Securities
The following is a distribution of the maturity dates for fixed maturity securities. The maturity dates have not been adjusted for possible calls or prepayments.
 March 31, 2026
 
Amortized Cost, Net of ACL1
Unrealized Gain PositionUnrealized Loss Position
 Gross GainFair ValueGross LossFair Value
(in millions of dollars)
1 year or less$1,258.8 $2.8 $336.8 $5.4 $919.4 
Over 1 year through 5 years6,719.4 150.7 3,094.7 125.2 3,650.2 
Over 5 years through 10 years7,591.2 177.3 3,167.3 393.3 4,207.9 
Over 10 years18,589.5 282.3 4,498.2 2,304.2 12,069.4 
34,158.9 613.1 11,097.0 2,828.1 20,846.9 
Mortgage/Asset-Backed Securities2
1,371.9 7.7 556.4 22.7 800.5 
Total Fixed Maturity Securities$35,530.8 $620.8 $11,653.4 $2,850.8 $21,647.4 
 December 31, 2025
 
Amortized Cost, Net of ACL1
Unrealized Gain PositionUnrealized Loss Position
 Gross GainFair ValueGross LossFair Value
(in millions of dollars)
1 year or less$1,379.9 $3.4 $430.5 $5.1 $947.7 
Over 1 year through 5 years6,484.9 159.7 3,512.5 88.9 3,043.2 
Over 5 years through 10 years7,476.9 260.3 3,873.6 336.5 3,527.1 
Over 10 years18,212.3 389.3 5,655.9 2,058.9 10,886.8 
33,554.0 812.7 13,472.5 2,489.4 18,404.8 
Mortgage/Asset-Backed Securities2
1,187.3 9.3 697.4 17.3 481.9 
Total Fixed Maturity Securities$34,741.3 $822.0 $14,169.9 $2,506.7 $18,886.7 
1Allowance for Credit Losses
2Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types
Distribution by External Credit Rating for Fixed Maturity Securities
The following chart depicts an analysis of our fixed maturity security portfolio between investment-grade and below-investment-grade categories as of March 31, 2026:

Gross Unrealized Loss
Fair ValueGross Unrealized GainAmountPercent of Total Gross Unrealized Loss
(in millions of dollars)
Investment-Grade$32,046.8 $605.8 $2,784.0 97.7 %
Below-Investment-Grade1,254.0 15.0 66.8 2.3 
Total Fixed Maturity Securities$33,300.8 $620.8 $2,850.8 100.0 %
Debt Securities, Available-for-sale, Allowance for Credit Loss
The following table presents a rollforward of the allowance for credit losses on available-for-sale fixed maturity securities, which were classified as "all other corporate bonds" during the three months ended March 31, 2026 and March 31, 2025.

Three Months Ended March 31
20262025
(in millions of dollars)
Balance, beginning of period$5.9 $2.8 
Credit losses on securities for which credit losses were not previously recorded— 0.9 
Change in allowance due to change in intent to sell impaired security
(5.9)— 
Change in allowance on securities with allowance recorded in previous period— 0.1 
Balance, end of period$— $3.8 
Mortgage Loans by Property Type and Geographic Region
The carrying amount of mortgage loans by property type and geographic region are presented below.

March 31, 2026December 31, 2025
(in millions of dollars)
Carrying AmountPercent of TotalCarrying AmountPercent of Total
Property Type
Apartment$634.0 30.7 %$642.5 30.5 %
Industrial650.9 31.5 659.0 31.2 
Office283.4 13.7 313.3 14.9 
Retail470.4 22.8 467.0 22.1 
Other27.6 1.3 27.7 1.3 
Total$2,066.3 100.0 %$2,109.5 100.0 %
Region
New England$49.2 2.4 %$49.9 2.4 %
Mid-Atlantic158.0 7.6 159.9 7.6 
East North Central270.0 13.1 275.3 13.1 
West North Central134.6 6.5 135.9 6.4 
South Atlantic499.9 24.2 497.2 23.5 
East South Central88.6 4.3 96.7 4.6 
West South Central185.8 9.0 190.5 9.0 
Mountain235.1 11.4 255.3 12.1 
Pacific445.1 21.5 448.8 21.3 
Total$2,066.3 100.0 %$2,109.5 100.0 %
Schedule of Participating Mortgage Loans by Internal Credit Rating and Loan to Value
The following tables present information about mortgage loans by the applicable internal quality indicators:

March 31, 2026December 31, 2025
(in millions of dollars)
Carrying AmountPercent of TotalCarrying AmountPercent of Total
Internal Mortgage Rating
AA$128.5 6.2 %$125.6 6.0 %
A1,015.7 49.1 1,053.4 49.9 
BBB819.3 39.7 804.0 38.1 
BB97.0 4.7 120.5 5.7 
B5.8 0.3 6.0 0.3 
Total$2,066.3 100.0 %$2,109.5 100.0 %
Loan-to-Value Ratio1
<= 65%$1,703.4 82.5 %$1,701.2 80.6 %
> 65% <= 75%151.3 7.3 164.3 7.8 
> 75% <= 85%130.8 6.3 162.6 7.7 
> 85%80.8 3.9 81.4 3.9 
Total$2,066.3 100.0 %$2,109.5 100.0 %
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
Mortgage Loans by Credit Quality Indicators
The following tables present the amortized cost of our mortgage loans by year of origination and internal quality indicators at March 31, 2026 and December 31, 2025, respectively.

March 31, 2026
Prior to 202220222023202420252026Total
(in millions of dollars)
Internal Mortgage Rating
AA$128.6 $— $— $— $— $— $128.6 
A894.7 23.3 9.4 6.4 76.9 6.8 1,017.5 
BBB617.0 61.6 56.5 39.3 36.3 12.3 823.0 
BB77.9 — — — 20.4 — 98.3 
B14.2 — — — — — 14.2 
Total Amortized Cost1,732.4 84.9 65.9 45.7 133.6 19.1 2,081.6 
Allowance for credit losses(13.8)(0.3)(0.3)(0.2)(0.6)(0.1)(15.3)
Carrying Amount$1,718.6 $84.6 $65.6 $45.5 $133.0 $19.0 $2,066.3 
Loan-to-Value Ratio1
<=65%$1,486.8 $62.5 $38.4 $11.6 $89.1 $19.1 $1,707.5 
>65<=75%57.8 8.4 27.5 34.1 24.1 — 151.9 
>75%<=85%118.2 14.0 — — — — 132.2 
>85%69.6 — — — 20.4 — 90.0 
Total Amortized Cost1,732.4 84.9 65.9 45.7 133.6 19.1 2,081.6 
Allowance for credit losses(13.8)(0.3)(0.3)(0.2)(0.6)(0.1)(15.3)
Carrying Amount$1,718.6 $84.6 $65.6 $45.5 $133.0 $19.0 $2,066.3 
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
December 31, 2025
Prior to 2021
20212022202320242025Total
(in millions of dollars)
Internal Mortgage Rating
AA$100.1 $25.6 $— $— $— $— $125.7 
A794.0 144.9 23.6 9.5 6.4 77.2 1,055.6 
BBB482.4 131.2 61.8 56.7 39.4 36.4 807.9 
BB81.7 19.9 — — — 20.4 122.0 
B14.2 — — — — — 14.2 
Total Amortized Cost1,472.4 321.6 85.4 66.2 45.8 134.0 2,125.4 
Allowance for credit losses(13.5)(0.9)(0.3)(0.4)(0.2)(0.6)(15.9)
Carrying Amount$1,458.9 $320.7 $85.1 $65.8 $45.6 $133.4 $2,109.5 
Loan-to-Value Ratio1
<=65%$1,264.1 $238.9 $63.0 $38.5 $11.6 $89.4 $1,705.5 
>65<=75%59.8 10.7 8.4 27.7 34.2 24.2 165.0 
>75%<=85%115.5 35.0 14.0 — — — 164.5 
>85%33.0 37.0 — — — 20.4 90.4 
Total Amortized Cost1,472.4 321.6 85.4 66.2 45.8 134.0 2,125.4 
Allowance for credit losses(13.5)(0.9)(0.3)(0.4)(0.2)(0.6)(15.9)
Carrying Amount$1,458.9 $320.7 $85.1 $65.8 $45.6 $133.4 $2,109.5 
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
Financing Receivable, Allowance for Credit Loss
The following tables present a roll-forward of allowance for expected credit losses by loan-to-value ratio for the three months ended March 31, 2026 and 2025:
Three Months Ended March 31, 2026
Beginning of YearCurrent Period ProvisionsWrite-OffsRecoveriesEnd of Period
(in millions of dollars)
Loan-to-Value Ratio1
<=65%$4.3 $(0.2)$— $— $4.1 
>65<=75%0.7 (0.1)— — 0.6 
>75%<=85%1.9 (0.5)— — 1.4 
>85%9.0 0.2 — — 9.2 
Total$15.9 $(0.6)$— $— $15.3 
Three Months Ended March 31, 2025
Beginning of YearCurrent Period ProvisionsWrite-OffsRecoveriesEnd of Period
(in millions of dollars)
Loan-to-Value Ratio1
<=65%$4.2 $(0.4)$— $— $3.8 
>65<=75%1.7 — — — 1.7 
>75%<=85%2.2 0.9 — — 3.1 
>85%8.0 — — — 8.0 
Total $16.1 $0.5 $— $— $16.6 
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
Remaining Contractual Maturity of Securities Lending Agreements
The remaining contractual maturities of our securities lending agreements disaggregated by class of collateral pledged are as follows:

March 31, 2026December 31, 2025
Overnight and Continuous
(in millions of dollars)
Borrowings
United States Government and Government Agencies and Authorities$0.3 $0.3 
Public Utilities0.8 4.8 
Short-Term Investments
— 0.1
All Other Corporate Bonds60.6 70.9 
Total Borrowings61.7 76.1 
Gross Amount of Recognized Liability for Securities Lending Transactions61.7 76.1 
Amounts Related to Agreements Not Included in Offsetting Disclosure Contained Herein$— $— 
Federal Home Loan Bank Common Stock Carrying Amounts, Amounts Posted, and Advances Received The carrying value of common stock owned, collateral posted, and advances received are as follows:
March 31, 2026December 31, 2025
(in millions of dollars)
Carrying Value of FHLB Common Stock$42.5 $40.7 
Advances from FHLB691.9 643.8 
Carrying Value of Collateral Posted to FHLB
Fixed Maturity Securities$800.2 $752.4 
Commercial Mortgage Loans1,078.0 1,110.2 
Total Carrying Value of Collateral Posted to FHLB$1,878.2 $1,862.6 
Schedule of Financial Instrument and Derivative Offsetting
Shown below are our financial instruments that either meet the accounting requirements that allow them to be offset in our balance sheets or that are subject to an enforceable master netting arrangement or similar agreement. Our accounting policy is to not offset these financial instruments in our balance sheets. Net amounts disclosed below have been reduced by the amount of collateral pledged to or received from our counterparties.

March 31, 2026
Gross AmountGross Amount Not
of RecognizedGross AmountNet AmountOffset in Balance Sheet
FinancialOffset inPresented inFinancialCashNet
InstrumentsBalance SheetBalance SheetInstrumentsCollateralAmount
(in millions of dollars)
Financial Assets:
Derivatives$60.7 $— $60.7 $(60.1)$(0.5)$0.1 
Securities Lending95.7 — 95.7 (34.0)(61.7)— 
Total$156.4 $— $156.4 $(94.1)$(62.2)$0.1 
Financial Liabilities:
Derivatives$261.0 $— $261.0 $(260.8)$— $0.2 
Securities Lending61.7 — 61.7 (61.7)— — 
Total$322.7 $— $322.7 $(322.5)$— $0.2 

December 31, 2025
Gross AmountGross Amount Not
of RecognizedGross AmountNet AmountOffset in Balance Sheet
FinancialOffset inPresented inFinancialCashNet
InstrumentsBalance SheetBalance SheetInstrumentsCollateralAmount
(in millions of dollars)
Financial Assets:
Derivatives$51.9 $— $51.9 $(51.9)$— $— 
Securities Lending106.1 — 106.1 (30.0)(76.1)— 
Total$158.0 $— $158.0 $(81.9)$(76.1)$— 
Financial Liabilities:
Derivatives$269.7 $— $269.7 $(269.3)$— $0.4 
Securities Lending76.1 — 76.1 (76.1)— — 
Total$345.8 $— $345.8 $(345.4)$— $0.4 
Net Investment Income
Net investment income reported in our consolidated statements of income is presented below.

 Three Months Ended March 31
 20262025
 (in millions of dollars)
Fixed Maturity Securities$425.4 $463.3 
Derivatives3.6 (4.2)
Mortgage Loans21.6 21.8 
Policy Loans5.3 5.2 
Other Long-term Investments
Perpetual Preferred Securities
— 0.8 
Private Equity Partnerships1
23.2 18.3 
Other4.2 4.3 
Short-term Investments24.8 28.0 
Gross Investment Income508.1 537.5 
Less Investment Expenses21.8 21.4 
Less Investment Income on Participation Fund Account Assets2.9 2.9 
Net Investment Income$483.4 $513.2 
1The net unrealized gain recognized in net investment income for the three months ended March 31, 2026 related to private equity partnerships still held at March 31, 2026 was $29.7 million, reduced by net management fees and partnership expenses of $(6.5) million. The net unrealized gain (loss) recognized in net investment income for the three months ended March 31, 2025 related to private equity partnerships still held at March 31, 2025 was $26.4 million, reduced by net management fees and partnership expense of $(8.1) million. See Note 3 for further discussion of private equity partnerships.
Investment Gains and Losses Reported in Consolidated Statements of Income
Investment gains and losses are as follows:

 Three Months Ended March 31
 20262025
 (in millions of dollars)
Fixed Maturity Securities
Gross Gains on Sales$1.3 $0.6 
Gross Losses on Sales1
(1.8)(45.3)
Impairment Loss2
(8.1)(152.4)
Credit Losses5.9 (1.0)
Mortgage Loans and Other Invested Assets
Impairment Loss
— (3.8)
Change in Allowance for Credit Losses0.6 (0.4)
Embedded Derivative in Modified Coinsurance Arrangement(3.0)(1.9)
All Other Derivatives1.5 (5.3)
Foreign Currency Transactions(1.4)2.7 
Net Investment Loss$(5.0)$(206.8)

1During the three months ended March 31, 2025, we recognized a $23.5 million net loss on sales of fixed maturity securities related to the Closed Block long-term care and Unum US individual disability reinsurance transaction (Fortitude Re reinsurance transaction) and a $19.1 million loss on sales of fixed maturity securities related to the funding of an extraordinary dividend from a wholly owned insurance subsidiary to Unum Group.
2 During the three months ended March 31, 2025, we recognized a $152.4 million impairment loss based on the intent to dispose of fixed maturity securities with a fair value of $1,250.9 million related to the Fortitude Re reinsurance transaction.
Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position
The following charts indicate the length of time our fixed maturity securities have been in a gross unrealized loss position.

 March 31, 2026
 Less Than 12 Months12 Months or Greater
 Fair
Value		Gross
Unrealized
Loss		Fair
Value		Gross
Unrealized
Loss
(in millions of dollars)
United States Government and Government Agencies and Authorities$26.2 $0.6 $233.6 $16.6 
States, Municipalities, and Political Subdivisions162.9 3.4 1,907.1 471.7 
Foreign Governments81.2 1.7 344.3 157.7 
Public Utilities1,048.6 32.9 1,668.0 300.8 
Mortgage/Asset-Backed Securities1
539.5 5.2 261.0 17.5 
All Other Corporate Bonds4,851.2 123.9 10,516.0 1,718.6 
Redeemable Preferred Stocks2
4.0 — 3.8 0.2 
Total Fixed Maturity Securities$6,713.6 $167.7 $14,933.8 $2,683.1 

 December 31, 2025
 Less Than 12 Months12 Months or Greater
 Fair
Value		Gross
Unrealized
Loss		Fair
Value		Gross
Unrealized
Loss
(in millions of dollars)
United States Government and Government Agencies and Authorities$21.8 $0.4 $235.6 $15.6 
States, Municipalities, and Political Subdivisions138.2 3.6 1,922.2 462.8 
Foreign Governments264.6 5.5 318.2 151.8 
Public Utilities642.1 19.4 1,710.3 270.7 
Mortgage/Asset-Backed Securities1
206.6 0.4 275.3 16.9 
All Other Corporate Bonds2,060.0 40.6 11,087.9 1,518.9 
Redeemable Preferred Stocks— — 3.9 0.1 
Total Fixed Maturity Securities$3,333.3 $69.9 $15,553.4 $2,436.8 

1Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types
2Includes a de minimis gross unrealized loss for which the length of time has been for less than 12 months
v3.26.1
Derivative Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2026
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Nature and Amount of Collateral Received From and Posted To Derivative Counterparty The table below summarizes the nature and amount of collateral received from and posted to our derivative counterparties.
March 31, 2026December 31, 2025
(in millions of dollars)
Carrying Value of Collateral Received from Counterparties
Cash$0.5 $1.6 
Fixed Maturity Securities9.1 4.2 
$9.6 $5.8 
Carrying Value of Collateral Posted to Counterparties
Cash$13.3 $— 
Fixed Maturity Securities235.9 244.3 
$249.2 $244.3 
Fair Value Hedges Carrying Amount of Hedged Assets and Liabilities and Cumulative Basis Adjustments
The following tables summarize the amortized cost, carrying amount of hedged assets, and the related cumulative basis adjustments related to our fair value hedges:

March 31, 2026
(in millions of dollars)
Amortized Cost of Hedged Assets
Carrying Amount of Hedged Assets
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets
Fixed maturity securities:
Receive fixed functional currency interest, pay fixed foreign currency interest
$799.8 $683.6 $17.7 
December 31, 2025
(in millions of dollars)
Amortized Cost of Hedged Assets
Carrying Amount of Hedged Assets
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets
Fixed maturity securities:
Receive fixed functional currency interest, pay fixed foreign currency interest
$793.4 $695.0 $24.7 
Location and Fair Values of Derivative Financial Instruments
The following tables summarize the notional amounts and fair values of derivative financial instruments, as reported in our consolidated balance sheets. Derivative assets are included in other long-term investments, while derivative liabilities are included in other liabilities within our consolidated balance sheets. The notional amounts represent the basis upon which our counterparty pay and receive amounts are calculated.

 March 31, 2026
 Derivative AssetsDerivative Liabilities
 Notional
Amount		Fair
Value		Fair
Value
(in millions of dollars)
Designated as Hedging Instruments
Cash Flow Hedges
Forward Benchmark Interest Rate Locks$2,526.0 $0.9 $218.7 
Foreign Currency Interest Rate Swaps120.0 14.3 1.1 
Total Cash Flow Hedges2,646.0 15.2 219.8 
Fair Value Hedges
Foreign Currency Interest Rate Swaps822.6 44.5 26.9 
Total Designated as Hedging Instruments$3,468.6 $59.7 $246.7 
Not Designated as Hedging Instruments
Foreign Currency Forwards$47.1 $0.8 $0.7 
Foreign Currency Interest Rate Swaps102.3 0.2 13.6 
Total Return Swaps151.4 — — 
Embedded Derivative in Modified Coinsurance Arrangement— 14.8 — 
Total Not Designated as Hedging Instruments$300.8 $15.8 $14.3 
Total Derivatives$3,769.4 $75.5 $261.0 
 December 31, 2025
 Derivative AssetsDerivative Liabilities
 Notional
Amount		Fair
Value		Fair
Value
(in millions of dollars)
Designated as Hedging Instruments
Cash Flow Hedges
Forward Benchmark Interest Rate Locks$2,603.0 $2.3 $222.9 
Foreign Currency Interest Rate Swaps127.3 14.3 1.7 
Total Cash Flow Hedges2,730.3 16.6 224.6 
Fair Value Hedges
Foreign Currency Interest Rate Swaps768.6 35.0 29.0 
Total Designated as Hedging Instruments$3,498.9 $51.6 $253.6 
Not Designated as Hedging Instruments
Foreign Currency Forwards$48.9 $0.1 $1.0 
Foreign Currency Interest Rate Swaps115.6 0.2 15.1 
Total Return Swaps154.8 — — 
Embedded Derivative in Modified Coinsurance Arrangement— 17.8 — 
Total Not Designated as Hedging Instruments$319.3 $18.1 $16.1 
Total Derivatives$3,818.2 $69.7 $269.7 
Location of Gains and Losses on Derivative Instruments Designated as Cash Flow Hedging Instruments
The following tables summarize the location of gains and losses of derivative financial instruments designated as hedging instruments, as reported in our consolidated statements of income.

 Three Months Ended March 31
20262025
Net Investment IncomeNet Investment Gain (Loss)Interest and Debt ExpenseNet Investment IncomeNet Investment Gain (Loss)Interest and Debt Expense
 (in millions of dollars)
Total Income and Expense Presented in the Consolidated Statements of Income of Which Hedged Items are Recorded$483.4 $(5.0)$53.1 $513.2 $(206.8)$52.0 
Gain (Loss) on Cash Flow Hedging Relationships
Interest Rate Swaps:
Hedged items10.8 — 0.7 17.4 (0.4)0.7 
Derivatives Designated as Hedging Instruments1.3 — — 2.6 0.4 — 
Foreign Exchange Contracts:
Hedged items1.8 (1.5)— 2.3 — — 
Derivatives Designated as Hedging Instruments0.1 1.0 — (0.7)— — 
Forward Benchmark Interest Rate Locks:
Hedged items16.7 — — 12.3 — — 
Derivatives Designated as Hedging Instruments(0.5)— — (0.4)— — 
Gain (Loss) on Fair Value Hedging Relationships
Foreign Exchange Contracts
Hedged items5.9 (7.0)— 4.4 21.5 — 
Derivatives Designated as Hedging Instruments2.8 7.0 — (5.2)(21.5)— 
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)
The following table summarizes the location of gains and losses of derivative financial instruments designated as cash flow hedging instruments, as reported in our consolidated statements of comprehensive income (loss).

Three Months Ended March 31
 20262025
 (in millions of dollars)
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives
Forward Benchmark Interest Rate Locks
$(8.9)$31.5 
Foreign Exchange Contracts0.5 1.0 
Total$(8.4)$32.5 
Gains and Losses on Derivatives Not Designated as Hedging Instruments
The following table summarizes the location of gains and losses on our derivatives not designated as hedging instruments, as reported in our consolidated statements of income.

 Three Months Ended March 31
 20262025
 (in millions of dollars)
Net Investment Gain (Loss)
Foreign Exchange Contracts$1.5 $(2.0)
Embedded Derivative in Modified Coinsurance Arrangement(3.0)(1.9)
Total Return Swaps
— (3.2)
Total$(1.5)$(7.1)
Net Investment Income
Total Return Swaps
$— $0.1 
Other Expenses
(Gain) Loss on Total Return Swaps
$5.6 $4.3 
v3.26.1
Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2026
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Components of accumulated other comprehensive loss (AOCI), after tax, and related changes are as follows:

Net Unrealized Loss on Securities
Effect of Change in Discount Rate Assumptions on the LFPB1
Net Loss on Derivatives
Foreign Currency Translation AdjustmentUnrecognized Pension and Postretirement Benefit CostsTotal
(in millions of dollars)
Balance at December 31, 2025$(2,003.1)$929.9 $(278.8)$(245.6)$(210.9)$(1,808.5)
Other Comprehensive Income (Loss) Before Reclassifications(431.3)465.2 (2.0)(23.0)1.2 10.1 
Amounts Reclassified from AOCI
2.1 — (1.3)— 2.1 2.9 
Net Other Comprehensive Income (Loss)(429.2)465.2 (3.3)(23.0)3.3 13.0 
Balance at March 31, 2026$(2,432.3)$1,395.1 $(282.1)$(268.6)$(207.6)$(1,795.5)
Balance at December 31, 2024$(2,755.2)$1,185.4 $(270.7)$(343.0)$(340.2)$(2,523.7)
Other Comprehensive Income (Loss) Before Reclassifications265.6 (166.3)47.5 42.3 (1.8)187.3 
Amounts Reclassified from AOCI
156.4 — (2.0)— 3.2 157.6 
Net Other Comprehensive Income (Loss)422.0 (166.3)45.5 42.3 1.4 344.9 
Balance at March 31, 2025$(2,333.2)$1,019.1 $(225.2)$(300.7)$(338.8)$(2,178.8)
1Liability for Future Policy Benefits
Schedule of Reclassification out of Accumulated Other Comprehensive Income (Loss)
Amounts reclassified from AOCI were recognized in our consolidated statements of income as follows:

Three Months Ended March 31
20262025
(in millions of dollars)
Net Unrealized Loss on Securities
Net Investment Loss on Fixed Maturity Securities
Net Loss on Sales$(0.5)$(44.7)
Impairment Loss(8.1)(152.4)
Change in Allowance for Credit Losses1
5.9 (1.0)
(2.7)(198.1)
Income Tax Benefit(0.6)(41.7)
Total$(2.1)$(156.4)
Net Loss on Derivatives
Net Investment Income
Gain on Interest Rate Swaps and Forwards$0.8 $2.2 
Net Investment Gain
Gain on Interest Rate Swaps— 0.4 
Gain (Loss) on Foreign Currency Interest Rate Swaps0.9 (0.1)
1.7 2.5 
Income Tax Expense0.4 0.5 
Total$1.3 $2.0 
Unrecognized Pension and Postretirement Benefit Costs
Other Expenses
Amortization of Net Actuarial Loss$(2.7)$(4.1)
Amortization of Prior Service Credit0.1 0.1 
(2.6)(4.0)
Income Tax Benefit(0.5)(0.8)
Total$(2.1)$(3.2)
1Includes change in allowance on securities impaired, sold or otherwise disposed during the period.
v3.26.1
Financial Services, Insurance (Tables)
 3 Months Ended
Mar. 31, 2026
Insurance [Abstract]  
Liability for Future Policy Benefit, Activity
The following table presents balances as well as the changes in the liability for future policy benefits for traditional long duration products.
Consolidated
March 31
20262025
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year$14,416.5$13,930.6
Beginning balance at original discount rate14,393.0 14,266.9 
Effect of changes in cash flow assumptions— — 
Effect of actual variances from expected experience(235.0)(183.2)
Adjusted beginning of year balance14,158.014,083.7
Issuances529.8502.2
Interest accretion162.5163.2
Net premiums collected(455.3)(435.4)
Foreign currency(12.7)21.2
Ending balance at original discount rate14,382.314,334.9
Effect of change in discount rate assumptions(189.0)(181.4)
Balance, end of period$14,193.3$14,153.5
Present Value of Expected Future Policy Benefits
Balance, beginning of year$50,683.1$48,920.1
Beginning balance at original discount rate51,638.5 50,778.2 
Effect of changes in cash flow assumptions— — 
Effect of actual variances from expected experience(174.4)(289.0)
Adjusted beginning of year balance51,464.150,489.2
Issuances1
1,300.71,272.5
Interest accretion582.5572.7
Benefit payments(1,641.1)(1,618.7)
Foreign currency(63.9)103.6
Ending balance at original discount rate51,642.350,819.3
Effect of change in discount rate assumptions(1,865.4)(1,422.9)
Balance, end of period$49,776.9$49,396.4
Net liability for future policy benefits$35,583.6$35,242.9
Other2
1,528.9 1,580.0 
Total liability for future policy benefits37,112.5 36,822.9 
Less: Reinsurance recoverable related to future policy benefits10,040.1 6,888.2 
Net liability for future policy benefits, after reinsurance recoverable$27,072.4$29,934.7
1Issuances include new policy issuances for most product lines. For our Unum US group disability, Unum US group life and AD&D and Closed Block - All Other product lines and certain of our Unum International product lines, this line represents new claim incurrals.
2Other primarily relates to our Closed Block - All Other product line.
The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products presented in the rollforward activity above.

Consolidated
March 31
20262025
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$2,742.8$2,592.1
Interest accretion$420.0$409.5

Consolidated
March 31
20262025
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$101,887.4 $103,072.4 
Expected future gross premiums$39,799.3 $39,765.5 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$26,452.4 $26,189.2 
Weighted average interest rate:
Interest accretion rate5.0 %4.9 %
Current discount rate5.4 %5.2 %
Weighted average duration of the liability11.1 years11.4 years
The following tables present the balances and changes in the reserves for future policy benefits for traditional long duration products in the Unum US segment.
March 31, 2026
Group DisabilityGroup Life and AD&DVoluntary Benefits
Individual Disability
Total Unum US
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year $—$—$1,385.5$1,236.5$2,622.0
Beginning balance at original discount rate——1,447.31,232.52,679.8
Effect of changes in cash flow assumptions—————
Effect of actual variances from expected experience——(39.7)(6.3)(46.0)
Adjusted beginning of year balance——1,407.61,226.22,633.8
Issuances——292.451.4343.8
Interest accretion——13.513.126.6
Net premiums collected——(66.7)(48.7)(115.4)
Ending balance at original discount rate——1,646.81,242.02,888.8
Effect of change in discount rate assumptions——(78.1)(11.3)(89.4)
Balance, end of period$—$—$1,568.7$1,230.7$2,799.4
Present Value of Expected Future Policy Benefits
Balance, beginning of year$4,588.1$801.6$2,536.9$3,140.7$11,067.3
Beginning balance at original discount rate4,656.9807.52,751.13,150.411,365.9
Effect of changes in cash flow assumptions—————
Effect of actual variances from expected experience(16.0)(21.9)(40.9)2.9(75.9)
Adjusted beginning of year balance4,640.9785.62,710.23,153.311,290.0
Issuances1
406.1194.2303.552.9956.7
Interest accretion38.64.528.936.5108.5
Benefit payments(460.1)(195.9)(84.1)(75.5)(815.6)
Ending balance at original discount rate4,625.5788.42,958.53,167.211,539.6
Effect of change in discount rate assumptions(105.5)(10.1)(254.7)(58.3)(428.6)
Balance, end of period$4,520.0$778.3$2,703.8$3,108.9$11,111.0
Net liability for future policy benefits$4,520.0$778.3$1,135.1$1,878.2$8,311.6
Other0.10.94.626.632.2
Total liability for future policy benefits4,520.1779.21,139.71,904.88,343.8
Less: Reinsurance recoverable related to future policy benefits23.87.313.0374.5418.6
Net liability for future policy benefits, after reinsurance recoverable$4,496.3$771.9$1,126.7$1,530.3$7,925.2
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.
March 31, 2025
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Total Unum US
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year$—$—$1,240.2$1,202.5$2,442.7
Beginning balance at original discount rate——1,335.31,230.72,566.0
Effect of changes in cash flow assumptions—————
Effect of actual variances from expected experience——(55.1)(48.0)(103.1)
Adjusted beginning of year balance——1,280.21,182.72,462.9
Issuances——250.793.4344.1
Interest accretion——12.413.025.4
Net premiums collected——(58.2)(47.1)(105.3)
Ending balance at original discount rate——1,485.11,242.02,727.1
Effect of change in discount rate assumptions——(78.6)(14.9)(93.5)
Balance, end of period$—$—$1,406.5$1,227.1$2,633.6
Present Value of Expected Future Policy Benefits
Balance, beginning of year $4,735.8$835.2$2,362.5$3,096.5$11,030.0
Beginning balance at original discount rate4,907.5852.62,614.63,191.111,565.8
Effect of changes in cash flow assumptions—————
Effect of actual variances from expected experience(45.3)(20.9)(58.1)(54.5)(178.8)
Adjusted beginning of year balance4,862.2831.72,556.53,136.611,387.0
Issuances1
410.6203.6260.895.7970.7
Interest accretion42.14.827.737.0111.6
Benefit payments(452.4)(220.9)(74.2)(74.5)(822.0)
Ending balance at original discount rate4,862.5819.22,770.83,194.811,647.3
Effect of change in discount rate assumptions(133.9)(13.2)(229.2)(55.9)(432.2)
Balance, end of period$4,728.6$806.0$2,541.6$3,138.9$11,215.1
Net liability for future policy benefits$4,728.6$806.0$1,135.1$1,911.8$8,581.5
Other0.20.82.825.829.6
Total liability for future policy benefits4,728.8806.81,137.91,937.68,611.1
Less: Reinsurance recoverable related to future policy benefits25.56.213.373.4118.4
Net liability for future policy benefits, after reinsurance recoverable$4,703.3$800.6$1,124.6$1,864.2$8,492.7
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.
The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Unum US segment presented in the rollforward activity above.

March 31, 2026
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Total Unum US
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$814.6$556.5$240.4$174.5$1,786.0
Interest accretion$38.6$4.5$15.4$23.4$81.9

March 31, 2025
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Total Unum US
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$779.6$520.3$219.9$170.8$1,690.6
Interest accretion$42.1$4.8$15.3$24.0$86.2

March 31, 2026
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Total Unum US
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$5,571.5 $891.3 $6,188.6 $5,095.2 $17,746.6 
Expected future gross premiums$— $— $6,887.3 $5,812.4 $12,699.7 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$— $— $4,404.1 $4,191.8 $8,595.9 
Weighted average interest rate:
Interest accretion rate4.3 %2.4 %5.0 %5.2 %4.4 %
Current discount rate4.7 %2.7 %5.7 %5.2 %4.7 %
Weighted average duration of the liability3.9 years2.3 years18.2 years9.4 years7.0 years
March 31, 2025
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Total Unum US
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$5,862.0 $930.0 $5,868.6 $5,138.4 $17,799.0 
Expected future gross premiums$— $— $6,325.6 $5,812.6 $12,138.2 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$— $— $4,121.9 $4,181.3 $8,303.2 
Weighted average interest rate:
Interest accretion rate4.2 %2.4 %5.0 %5.1 %4.3 %
Current discount rate4.7 %2.7 %5.5 %5.1 %4.7 %
Weighted average duration of the liability4.1 years2.5 years18.4 years9.5 years7.1 years
The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Unum International segment.

March 31
20262025
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year$352.8$276.1
Beginning balance at original discount rate378.0 314.2 
Effect of changes in cash flow assumptions— — 
Effect of actual variances from expected experience(1.4)1.1 
Adjusted beginning of year balance376.6315.3
Issuances11.48.3
Interest accretion3.73.0
Net premiums collected(9.4)(7.8)
Foreign currency(12.7)21.2
Ending balance at original discount rate369.6340.0
Effect of change in discount rate assumptions(41.5)(37.5)
Balance, end of period$328.1$302.5
Present Value of Expected Future Policy Benefits
Balance, beginning of year$2,699.0$2,391.6
Beginning balance at original discount rate2,923.4 2,641.5 
Effect of changes in cash flow assumptions— — 
Effect of actual variances from expected experience(3.7)(7.3)
Adjusted beginning of year balance2,919.72,634.2
Issuances1
138.4117.6
Interest accretion19.917.5
Benefit payments(158.3)(138.9)
Foreign currency(63.9)103.6
Ending balance at original discount rate2,855.82,734.0
Effect of change in discount rate assumptions(337.4)(266.5)
Balance, end of period$2,518.4$2,467.5
Net liability for future policy benefits$2,190.3$2,165.0
Other49.5 45.8 
Total liability for future policy benefits2,239.8 2,210.8 
Less: Reinsurance recoverable related to future policy benefits71.4 68.7 
Net liability for future policy benefits, after reinsurance recoverable$2,168.4$2,142.1
1Issuances for Unum International primarily represents new claim incurrals.
The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Unum International segment presented in the rollforward activity above.
March 31
20262025
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$287.3$241.3
Interest accretion$16.2$14.5

March 31
20262025
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$4,627.9 $4,431.6 
Expected future gross premiums$1,631.1 $1,419.2 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$1,011.5 $895.9 
Weighted average interest rate:
Interest accretion rate4.2 %4.1 %
Current discount rate5.5 %5.2 %
Weighted average duration of the liability8.7 years8.9 years
The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Colonial Life segment.
March 31
20262025
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year$3,709.0$3,553.3
Beginning balance at original discount rate3,850.9 3,793.8 
Effect of changes in cash flow assumptions— — 
Effect of actual variances from expected experience(13.5)(11.3)
Adjusted beginning of year balance3,837.43,782.5
Issuances174.6149.8
Interest accretion37.136.8
Net premiums collected(168.8)(165.2)
Ending balance at original discount rate3,880.33,803.9
Effect of change in discount rate assumptions(182.4)(198.8)
Balance, end of period$3,697.9$3,605.1
Present Value of Expected Future Policy Benefits
Balance, beginning of year$5,710.4$5,434.9
Beginning balance at original discount rate6,179.4 6,026.2 
Effect of changes in cash flow assumptions— — 
Effect of actual variances from expected experience(25.8)(20.0)
Adjusted beginning of year balance6,153.66,006.2
Issuances182.7157.3
Interest accretion61.960.5
Benefit payments(170.0)(168.1)
Ending balance at original discount rate6,228.26,055.9
Effect of change in discount rate assumptions(546.1)(531.4)
Balance, end of period$5,682.1$5,524.5
Net liability for future policy benefits$1,984.2$1,919.4
Other29.3 24.7 
Total liability for future policy benefits2,013.5 1,944.1 
Less: Reinsurance recoverable related to future policy benefits1.5 1.0 
Net liability for future policy benefits, after reinsurance recoverable$2,012.0$1,943.1
The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Colonial Life segment presented in the rollforward activity above.

March 31
20262025
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$457.1$442.0
Interest accretion$24.8$23.7

March 31
20262025
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$11,231.7 $10,537.5 
Expected future gross premiums$13,374.6 $12,748.0 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$9,425.7 $9,110.3 
Weighted average interest rate:
Interest accretion rate4.4 %4.4 %
Current discount rate5.5 %5.3 %
Weighted average duration of the liability17.6 years17.3 years
The following table presents the balances and changes in the reserves for future policy benefits for traditional long duration products in the Closed Block segment.
March 31, 2026
Long-term CareAll OtherTotal Closed Block
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year $7,732.7$—$7,732.7
Beginning balance at original discount rate7,484.3—7,484.3
Effect of changes in cash flow assumptions———
Effect of actual variances from expected experience(174.1)—(174.1)
Adjusted beginning of year balance7,310.2—7,310.2
Interest accretion95.1—95.1
Net premiums collected(161.7)—(161.7)
Ending balance at original discount rate7,243.6—7,243.6
Effect of change in discount rate assumptions124.3—124.3
Balance, end of period$7,367.9$—$7,367.9
Present Value of Expected Future Policy Benefits
Balance, beginning of year $24,420.6$6,785.8$31,206.4
Beginning balance at original discount rate24,113.67,056.231,169.8
Effect of changes in cash flow assumptions———
Effect of actual variances from expected experience(64.1)(4.9)(69.0)
Adjusted beginning of year balance24,049.57,051.331,100.8
Issuances1
—22.922.9
Interest accretion314.577.7392.2
Benefit payments(283.0)(214.2)(497.2)
Ending balance at original discount rate24,081.06,937.731,018.7
Effect of change in discount rate assumptions(192.3)(361.0)(553.3)
Balance, end of period$23,888.7$6,576.7$30,465.4
Net liability for future policy benefits$16,520.8$6,576.7$23,097.5
Other2
10.21,407.71,417.9
Total liability for future policy benefits16,531.07,984.424,515.4
Less: Reinsurance recoverable related to future policy benefits3,293.46,255.29,548.6
Net liability for future policy benefits, after reinsurance recoverable$13,237.6$1,729.2$14,966.8
1Issuances for Closed Block - All Other represents new claim incurrals.
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.
March 31, 2025
Long-term CareAll OtherTotal Closed Block
(in millions of dollars)
Present Value of Expected Net Premiums
Balance, beginning of year $7,658.5$—$7,658.5
Beginning balance at original discount rate7,592.9—7,592.9
Effect of changes in cash flow assumptions———
Effect of actual variances from expected experience(69.9)—(69.9)
Adjusted beginning of year balance7,523.0—7,523.0
Interest accretion98.0—98.0
Net premiums collected(157.1)—(157.1)
Ending balance at original discount rate7,463.9—7,463.9
Effect of change in discount rate assumptions148.4—148.4
Balance, end of period$7,612.3$—$7,612.3
Present Value of Expected Future Policy Benefits
Balance, beginning of year$22,925.2$7,138.4$30,063.6
Beginning balance at original discount rate22,953.77,591.030,544.7
Effect of changes in cash flow assumptions———
Effect of actual variances from expected experience(63.0)(19.9)(82.9)
Adjusted beginning of year balance22,890.77,571.130,461.8
Issuances1
—26.926.9
Interest accretion299.683.5383.1
Benefit payments(254.3)(235.4)(489.7)
Ending balance at original discount rate22,936.07,446.130,382.1
Effect of change in discount rate assumptions176.9(369.7)(192.8)
Balance, end of period$23,112.9$7,076.4$30,189.3
Net liability for future policy benefits$15,500.6$7,076.4$22,577.0
Other2
0.21,479.71,479.9
Total liability for future policy benefits15,500.88,556.124,056.9
Less: Reinsurance recoverable related to future policy benefits3.76,696.46,700.1
Net liability for future policy benefits, after reinsurance recoverable$15,497.1$1,859.7$17,356.8
1Issuances for Closed Block - All Other represents new claim incurrals.
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.
The following tables summarize the amount of gross premiums and interest accretion reflected in the statements of income as well as the undiscounted and discounted expected gross premiums and expected future benefit payments and the weighted average interest rates for traditional long duration products in the Closed Block segment presented in the rollforward activity above.

March 31, 2026
Long-term CareAll OtherTotal Closed Block
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$176.9$35.5$212.4
Interest accretion$219.4$77.7$297.1

March 31, 2025
Long-term CareAll OtherTotal Closed Block
(in millions of dollars)
Amount recognized in the statement of income:
Gross premiums or assessments$176.2$42.0$218.2
Interest accretion$201.6 $83.5$285.1

March 31, 2026
Long-term CareAll OtherTotal Closed Block
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$58,230.7 $10,050.5$68,281.2 
Expected future gross premiums$12,093.9 $—$12,093.9 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$7,419.3 $—$7,419.3 
Weighted average interest rate:
Interest accretion rate5.6 %4.6 %5.3 %
Current discount rate5.7%5.3 %5.6 %
Weighted average duration of the liability14.4 years7.1 years12.2 years
March 31, 2025
Long-term CareAll OtherTotal Closed Block
(in millions of dollars, except weighted average data)
Amount of undiscounted:
Expected future benefit payments$59,439.9 $10,864.4$70,304.3 
Expected future gross premiums$13,460.1 $—$13,460.1 
Amount of discounted (at interest accretion rate):
Expected future gross premiums$7,879.8 $—$7,879.8 
Weighted average interest rate:
Interest accretion rate5.6 %4.6 %5.3 %
Current discount rate5.5 %5.2 %5.4 %
Weighted average duration of the liability15.5 years7.2 years12.8 years
A reconciliation of the liability for future policy benefits reflected in the preceding rollforwards to the related liability balances in the consolidated balance sheets are as follows:

March 31
20262025
(in millions of dollars)
Liability for future policy benefits
Unum US1
$8,343.8 $8,611.1 
Unum International1
2,239.8 2,210.8 
Colonial Life2,013.5 1,944.1 
Closed Block1
24,515.4 24,056.9 
Other products1
188.0 207.8 
Total liability for future policy benefits$37,300.5 $37,030.7 

1Unum US excludes the dental and vision product line and medical stop-loss products, Unum International excludes certain products in our supplemental product line and Closed Block excludes our participating fund account, which represents policies issued by one of our subsidiaries prior to its conversion from a mutual stock life insurance company. The liabilities associated with these products are included within Other products.
Policyholder Account Balance
The following table presents the balances and changes in the policyholders' account balances:

March 31, 2026
Unum US - Voluntary BenefitsColonial LifeClosed Block - All Other Total
(in millions of dollars, except weighted average data)
Balance, beginning of year    $548.4 $845.2 $4,073.4 $5,467.0 
Premiums received11.4 18.3 5.0 34.7 
Policy charges1
(13.1)(17.1)(29.0)(59.2)
Surrenders and withdrawals(11.6)(10.0)(3.6)(25.2)
Benefit payments(1.4)(2.2)(54.2)(57.8)
Interest credited4.8 8.4 83.7 96.9 
Other1.7 (0.3)0.8 2.2 
Balance, end of period540.2 842.3 4,076.1 5,458.6 
Reserves in excess of account balance118.8 13.4 38.7 170.9 
Total policyholders' account balances659.0 855.7 4,114.8 5,629.5 
Less: Reinsurance recoverable related to policyholders' account balances0.7 —4,114.84,115.5
Net policyholders' account balances, after reinsurance recoverable$658.3 $855.7 $— $1,514.0 
Weighted average crediting rate3.6%4.1%8.6%7.3%
Net amount at risk2
$3,635.6 $7,546.5$1,608.0$12,790.1 
Cash surrender value $530.7 $824.1$4,042.5$5,397.3 
1Contracts included in the policyholders' account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.

A reconciliation of policyholders' account balances reflected in the preceding rollforward to the related liability balances in the consolidated balance sheets is as follows:

March 31
2026
(in millions of dollars)
Policyholders' account balances
Unum US
$659.0
Colonial Life855.7
Closed Block
4,114.8
Funding agreements
106.5
Total policyholders' account balances$5,736.0 
March 31, 2025
Unum US - Voluntary BenefitsColonial LifeClosed Block - All OtherTotal
(in millions of dollars, except weighted average data)
Balance, beginning of year    $568.8$849.0 $4,052.2 $5,470.0 
Premiums received12.919.4 7.9 40.2 
Policy charges1
(13.9)(17.6)(28.4)(59.9)
Surrenders and withdrawals(8.9)(10.0)(4.3)(23.2)
Benefit payments(1.6)(2.2)(65.4)(69.2)
Interest credited5.18.5 82.0 95.6 
Other2.5(0.1)0.1 2.5 
Balance, end of period564.9 847.0 4,044.1 5,456.0 
Reserves in excess of account balance109.213.841.8164.8 
Total policyholders' account balances674.1 860.8 4,085.9 5,620.8 
Less: Reinsurance recoverable related to policyholders' account balances0.80.14,085.94,086.8
Net policyholders' account balances, after reinsurance recoverable$673.3$860.7$—$1,534.0
Weighted average crediting rate3.7%4.1%8.4%7.2%
Net amount at risk2
$4,040.4$8,057.8$1,701.8$13,800.0 
Cash surrender value $554.9$821.1$4,017.0$5,393.0 
1Contracts included in the policyholders' account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.
Policyholder Account Balance, Guaranteed Minimum Crediting Rate
The balance of the account values by range of guaranteed minimum crediting rates and the related range of difference, in basis points, between rates being credited to policyholders' and the respective guaranteed minimums is as follows.

March 31, 2026
Range of Guaranteed Minimum Crediting RateAt Guaranteed Minimum1 Basis Point - 50 Basis Points Above51 Basis Points - 150 Basis Points AboveGreater than 150 Basis Points AboveTotal
(in millions of dollars)
Unum US - Voluntary Benefits
3.00% - 3.99%
$83.3$—$—$—$83.3
4.00% - 4.99%
228.0201.2——429.2
5.00% - 6.00%
27.7———27.7
339.0201.2——540.2
Colonial Life
4.00% - 5.00%
835.96.4——842.3
Closed Block - All Other
3.00% - 5.99%
1,401.728.96.5—1,437.1
6.00% - 8.99%
24.7———24.7
9.00% - 11.99%
2,390.1———2,390.1
12.00% - 15.00%
224.2———224.2
4,040.728.96.5—4,076.1
Total$5,215.6$236.5$6.5$—$5,458.6
March 31, 2025
Range of Guaranteed Minimum Crediting RateAt Guaranteed Minimum1 Basis Point - 50 Basis Points Above51 Basis Points - 150 Basis Points AboveGreater than 150 Basis Points AboveTotal
(in millions of dollars)
Unum US - Voluntary Benefits
3.00% - 3.99%
$87.9$—$—$—$87.9
4.00% - 4.99%
243.6203.0——446.6
5.00% - 6.00%
30.4———30.4
361.9203.0——564.9
Colonial Life
4.00% - 5.00%
840.76.3——847.0
Closed Block - All Other
3.00% - 5.99%
1,448.948.26.9— 1,504.0
6.00% - 8.99%
26.3——— 26.3
9.00% - 11.99%
2,306.7——— 2,306.7
12.00% - 15.00%
207.1——— 207.1
3,989.048.26.9—4,044.1
Total$5,191.6$257.5$6.9$—$5,456.0
Deferred Policy Acquisition Costs
The following tables display the changes in deferred acquisition costs throughout the period:

March 31, 2026
Unum USUnum InternationalColonial LifeTotal
(in millions of dollars)
Balance, beginning of year$1,208.7$72.1$1,639.5$2,920.3
Capitalization91.69.289.8190.6
Amortization expense(68.7)(3.4)(62.1)(134.2)
Foreign currency—(2.3)—(2.3)
Balance, end of period$1,231.6$75.6$1,667.2$2,974.4

March 31, 2025
Unum USUnum InternationalColonial LifeTotal
(in millions of dollars)
Balance, beginning of year$1,260.6$53.0$1,529.2$2,842.8
Capitalization84.75.382.6172.6
Amortization expense(65.2)(2.5)(57.7)(125.4)
Foreign currency—3.2—3.2
Balance, end of period$1,280.1$59.0$1,554.1$2,893.2

March 31, 2026
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Dental and Vision
Total Unum US
(in millions of dollars)
Balance, beginning of year$63.6$57.6$622.8$451.6$13.1$1,208.7
Capitalization16.312.334.025.43.691.6
Amortization expense (13.9)(8.7)(28.8)(13.6)(3.7)(68.7)
Balance, end of period$66.0$61.2$628.0$463.4$13.0$1,231.6

March 31, 2025
Group DisabilityGroup Life and AD&D
Voluntary Benefits
Individual Disability
Dental and Vision
Total Unum US
(in millions of dollars)
Balance, beginning of year$61.1$51.1$614.3$521.2$12.9$1,260.6
Capitalization16.1 11.632.221.03.884.7
Amortization expense(10.4)(6.1)(29.8)(15.4)(3.5)(65.2)
Balance, end of period$66.8$56.6$616.7$526.8$13.2$1,280.1
v3.26.1
Segment Information (Tables)
 3 Months Ended
Mar. 31, 2026
Segment Reporting [Abstract]  
Premium Income by Major Line of Business within Each Segment
Segment information is shown below. Certain prior year amounts were adjusted to conform to current year presentation. See below for more information regarding this update.
Three Months Ended March 31
20262025
(in millions of dollars)
Premium Income
Unum US
Group Disability
Group Long-term Disability$498.8 $504.5 
Group Short-term Disability310.7 278.3 
Group Life and Accidental Death & Dismemberment
Group Life495.4 466.2 
Accidental Death & Dismemberment53.0 48.2 
Supplemental and Voluntary
Voluntary Benefits253.8 234.1 
Individual Disability146.5 168.7 
Dental and Vision82.3 80.9 
1,840.5 1,780.9 
Unum International
Unum UK
Group Long-term Disability104.8 100.2 
Group Life77.0 61.6 
Supplemental50.3 41.9 
Unum Poland54.6 43.0 
286.7 246.7 
Colonial Life
Accident, Sickness, and Disability252.8 247.1 
Life128.3 119.9 
Cancer and Critical Illness91.6 90.3 
472.7 457.3 
Closed Block
Long-term Care159.4 176.2 
All Other34.7 41.8 
194.1 218.0 
Total Premium Income$2,794.0 $2,702.9 
Selected Operating Statement Data by Segment
Three Months Ended March 31, 2026
Unum USUnum InternationalColonial LifeClosed BlockCorporateTotal
(in millions of dollars)
Premium Income$1,840.5 $286.7 $472.7 $194.1 $— $2,794.0 
Net Investment Income158.3 29.6 46.8 229.1 19.6 483.4 
Other Income66.8 3.3 0.7 11.3 0.7 82.8 
Segment Adjusted Operating Revenue
2,065.6 319.6 520.2 434.5 20.3 3,360.2 
Policy Benefits
1,127.1 206.3 229.7 392.7 — 1,955.8 
Policy Benefits - Remeasurement Loss (Gain)
(31.8)(2.8)(12.4)95.2 — 48.2 
Commissions219.4 31.0 102.9 15.2 — 368.5 
Interest and Debt Expense— — — — 53.1 53.1 
Deferral of Acquisition Costs(91.6)(9.2)(89.8)— — (190.6)
Amortization of Deferred Acquisition Costs68.7 3.4 62.1 — — 134.2 
Other Segment Items1
435.9 60.0 99.9 76.7 10.8 683.3 
Benefits and Expenses
1,727.7 288.7 392.4 579.8 63.9 3,052.5 
Segment Adjusted Operating Income (Loss)
$337.9 $30.9 $127.8 $(145.3)$(43.6)$307.7 
1For each reportable segment, other segment items includes compensation, other personnel expenses, taxes, licenses and fees, depreciation, intangible asset amortization and other expenses. Depreciation and intangible asset amortization during the three months ended March 31, 2026 was $21.7 million, $5.5 million, $4.4 million, $1.6 million, and $0.2 million for our Unum US, Unum International, Colonial Life, Closed Block and Corporate segments, respectively.
Three Months Ended March 31, 2025
Unum USUnum InternationalColonial LifeClosed BlockCorporateTotal
(in millions of dollars)
Premium Income$1,780.9 $246.7 $457.3 $218.0 $— $2,702.9 
Net Investment Income148.9 28.5 42.2 269.7 23.9 513.2 
Other Income71.9 0.1 0.4 9.9 — 82.3 
Segment Adjusted Operating Revenue
2,001.7 275.3 499.9 497.6 23.9 3,298.4 
Policy Benefits
1,138.6 172.9 226.6 422.2 — 1,960.3 
Policy Benefits - Remeasurement Loss (Gain)
(75.4)(8.8)(8.5)3.4 — (89.3)
Commissions205.6 22.4 97.3 17.9 — 343.2 
Interest and Debt Expense— — — — 52.0 52.0 
Deferral of Acquisition Costs(84.7)(5.3)(82.6)— — (172.6)
Amortization of Deferred Acquisition Costs65.2 2.5 57.7 — — 125.4 
Other Segment Items1
423.3 52.9 93.7 46.1 13.0 629.0 
Benefits and Expenses
1,672.6 236.6 384.2 489.6 65.0 2,848.0 
Segment Adjusted Operating Income (Loss)
$329.1 $38.7 $115.7 $8.0 $(41.1)$450.4 
1For each reportable segment, other segment items includes compensation, other personnel expenses, taxes, licenses and fees, depreciation, intangible asset amortization and other expenses. Depreciation and intangible asset amortization during the three months ended March 31, 2025 was $21.3 million, $4.7 million, $4.2 million, $1.5 million, and $0.1 million for our Unum US, Unum International, Colonial Life, Closed Block and Corporate segments, respectively.
Assets by Segment
March 31December 31
20262025
(in millions of dollars)
Assets
Unum US$14,500.9 $14,635.3 
Unum International3,661.9 3,648.0 
Colonial Life5,332.4 5,289.9 
Closed Block32,503.2 33,887.8 
Corporate6,715.9 6,058.4 
Total Assets$62,714.3 $63,519.4 
Reconciliation of Total Revenue and Income Before Income Tax to Segment Adjusted Operating Revenue and Segment Adjusted Operating Income (Loss)
A reconciliation of total revenue to "segment adjusted operating revenue" and income before income tax to "segment adjusted operating income" is shown below.

Three Months Ended March 31
20262025
(in millions of dollars)
Total Revenue$3,355.2 $3,091.6 
Excluding:
Net Investment Loss(5.0)(206.8)
Segment Adjusted Operating Revenue
$3,360.2 $3,298.4 
Income Before Income Tax$302.7 $243.6 
Excluding:
Net Investment Loss
Net Investment Loss Related to the Fortitude Re Reinsurance Transaction— (175.9)
Net Investment Loss, Other(5.0)(30.9)
Total Net Investment Loss(5.0)(206.8)
Segment Adjusted Operating Income$307.7 $450.4 
v3.26.1
Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2026
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The following table provides the components of the net periodic benefit cost for the defined benefit pension and OPEB plans.
Three Months Ended March 31
 Pension Benefits  
 U.S. PlansU.K. PlanOPEB
 202620252026202520262025
(in millions of dollars)
Service Cost$1.8 $2.4 $— $— $— $— 
Interest Cost16.4 21.4 2.2 2.1 0.9 1.0 
Expected Return on Plan Assets(16.7)(21.8)(2.5)(2.2)(0.1)(0.1)
Amortization of:
   Net Actuarial Loss (Gain)
2.2 3.7 0.7 0.7 (0.2)(0.3)
   Prior Service Credit— — — — (0.1)(0.1)
Total Net Periodic Benefit Cost
$3.7 $5.7 $0.4 $0.6 $0.5 $0.5 
v3.26.1
Stockholders' Equity and Earnings Per Common Share (Tables)
 3 Months Ended
Mar. 31, 2026
Stockholders' Equity and Earnings Per Common Share [Abstract]  
Schedule of Basic and Diluted Earnings Per Share
Net income per common share is determined as follows:
 Three Months Ended March 31
 20262025
 (in millions of dollars, except share data)
Numerator
Net Income$232.0 $189.1 
Denominator (000s)
Weighted Average Common Shares - Basic164,073.9 178,291.5 
Dilution for Assumed Exercises of Nonvested Stock Awards325.6 590.9 
Weighted Average Common Shares - Assuming Dilution164,399.5 178,882.4 
Net Income Per Common Share
Basic$1.41 $1.06 
Assuming Dilution$1.41 $1.06 
Treasury Stock Transactions
Our board of directors has authorized the following repurchase programs:
December 2025 Authorization
February 2025 Authorization1
July 2024 Authorization2
(in millions)
Effective Date
January 1, 2026
April 1, 2025
August 1, 2024
Expiration Date
None
December 31, 2025
March 31, 2025
Authorized Repurchase Amount
$1,000.0 $1,000.0 $1,000.0 
Cost of Shares Repurchased Under Repurchase Program
398.6 800.0 706.8 
Unused and Expired
— 200.0 293.2 
Remaining Repurchase Amount at March 31, 2026
$601.4 $— $— 
1Concurrent with the announcement of the December 2025 repurchase program, we also announced the termination of the February 2025 program as of December 31, 2025, and any unused amounts under that program expired as of that date.
2Concurrent with the announcement of the February 2025 repurchase program, we also announced the termination of the July 2024 program as of March 31, 2025, and any unused amounts under that program expired as of that date.
Common stock repurchases, which are accounted for using the cost method and classified as treasury stock until otherwise retired, were as follows:
Three Months Ended March 31
20262025
(in millions)
Shares Repurchased1
5.4 3.3 
Cost of Shares Repurchased2
$402.4 $202.6 
1For the three months ended March 31, 2025, includes 0.7 million shares related to the settlement of the November 2024 accelerated share repurchase agreement (ASR) which occurred in February 2025.
2Includes $0.1 million and $0.5 million of commissions for the three months ended March 31, 2026 and 2025, respectively. Also includes $3.7 million and $2.1 million of excise taxes for the three months ended March 31, 2026 and 2025, respectively.

As a part of our share repurchase program, we periodically enter into accelerated share repurchase agreements. Under the terms of these agreements, we make a prepayment to a financial counterparty for which we receive an initial delivery of approximately 75 percent of the total Unum Group common stock to be delivered under the agreement. We simultaneously enter into a forward contract indexed to the price of Unum Group common stock, which subjects the transactions to a future price adjustment. Under the terms of the agreements, we are to receive, or be required to pay, a price adjustment based on the volume weighted average price of Unum Group common stock during the term of the agreement, less a discount. Any price adjustment payable to us is settled in shares of Unum Group common stock. Any price adjustment we would be required to pay may be settled in either cash or common stock at our option. In November 2024, we paid $321.0 million to a financial counterparty as a part of an accelerated share repurchase agreement. We received an initial delivery of 3.8 million shares of our common stock. The final price adjustment settlement, along with the delivery of the remaining shares, occurred in February 2025, resulting in the delivery to us of 0.7 million additional shares. As a result of the final settlement occurring subsequent to December 31, 2024, we recorded a decrease of $80.3 million to additional paid-in capital within stockholders' equity on our consolidated balance sheet for the value of the shares held back by the counterparty as of December 31, 2024, which was reclassified to treasury stock in the first quarter of 2025 in connection with the final settlement of the agreement
v3.26.1
Fair Values of Financial Instruments Private Equity Partnerships (Details) - Private Equity Partnerships - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share    
Alternative Investments $ 1,444.1 $ 1,456.3
Alternative Investments, Unfunded Commitments 834.5 756.7
Private Credit    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share    
Alternative Investments 231.2 255.8
Alternative Investments, Unfunded Commitments 119.0 121.0
Private Credit | Not Redeemable    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share    
Alternative Investments [1] 181.7 205.9
Alternative Investments, Unfunded Commitments 106.3 108.3 [1]
Private Credit | Quarterly/ 90 days notice    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share    
Alternative Investments 49.5 49.9
Alternative Investments, Unfunded Commitments 12.7 12.7
Private Equity Limited Partnership    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share    
Alternative Investments 658.7 651.4
Alternative Investments, Unfunded Commitments 448.8 422.3
Private Equity Limited Partnership | Not Redeemable    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share    
Alternative Investments [2] 625.6 618.9
Alternative Investments, Unfunded Commitments 428.4 406.8 [2]
Private Equity Limited Partnership | Initial 5.5 year lock on each new investment / Quarterly after 5.5 year lock with 90 days notice    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share    
Alternative Investments 33.1 32.5
Alternative Investments, Unfunded Commitments 20.4 15.5
Real Assets    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share    
Alternative Investments 554.2 549.1
Alternative Investments, Unfunded Commitments 266.7 213.4
Real Assets | Not Redeemable    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share    
Alternative Investments [3] 515.9 511.4
Alternative Investments, Unfunded Commitments 266.7 213.4 [3]
Real Assets | Quarterly/ 90 days notice    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share    
Alternative Investments 38.3 37.7
Alternative Investments, Unfunded Commitments $ 0.0 $ 0.0
[1] Private Credit - The limited partnerships described in this category employ various investment strategies, generally providing direct lending or other forms of debt financing including first-lien, second-lien, mezzanine, and subordinated loans. The limited partnerships have credit exposure to corporates, physical assets, and/or financial assets within a variety of industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail) in North America and, to a lesser extent, outside of North America.  As of March 31, 2026, the estimated remaining life of the investments that do not allow for redemptions is approximately 75 percent in the next 3 years, 7 percent during the period from 3 to 5 years, and 18 percent during the period from 5 to 10 years.
[2] Private Equity - The limited partnerships described in this category employ various strategies generally investing in controlling or minority control equity positions directly in companies and/or assets across various industries (including manufacturing, healthcare, energy, business services, technology, materials, and retail), primarily in private markets within North America and, to a lesser extent, outside of North America.  As of March 31, 2026, the estimated remaining life of the investments that do not allow for redemptions is approximately 44 percent in the next 3 years, 19 percent during the period from 3 to 5 years, 36 percent during the period from 5 to 10 years, and 1 percent during the period from 10 to 15 years.
[3] Real Assets - The limited partnerships described in this category employ various strategies, which include investing in the equity and/or debt financing of physical assets, including infrastructure (energy, power, water/wastewater, communications), transportation (including airports, ports, toll roads, aircraft, railcars) and real estate in North America, Europe, South America, and Asia.  As of March 31, 2026, the estimated remaining life of the investments that do not allow for redemptions is approximately 54 percent in the next 3 years, 23 percent during the period from 3 to 5 years, and 23 percent during the period from 5 to 10 years.
v3.26.1
Fair Value Measurements by Input Level (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Assets, Fair Value Disclosure    
Fixed Maturity Securities $ 33,300.8 $ 33,056.6
Equity Securities 20.0 20.0
Other Long-term Investments $ 1,664.8 $ 1,670.4
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other Long-term Investments Other Long-term Investments
Derivative Assets $ 75.5 $ 69.7
Assets, Fair Value Disclosure $ 34,840.4 $ 34,602.6
Liabilities    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other Liabilities Other Liabilities
Derivative Liabilities $ 261.0 $ 269.7
Liabilities, Fair Value Disclosure 261.0 269.7
Forwards    
Assets, Fair Value Disclosure    
Derivative Assets 1.7 2.4
Liabilities    
Derivative Liabilities 219.4 223.9
Foreign Exchange Contracts    
Assets, Fair Value Disclosure    
Derivative Assets 59.0 49.5
Liabilities    
Derivative Liabilities 41.6 45.8
Embedded Derivative in Modified Coinsurance Arrangement    
Assets, Fair Value Disclosure    
Derivative Assets 14.8 17.8
Fair Value, Measurements, Recurring    
Assets, Fair Value Disclosure    
Other Long-term Investments 1,539.6 1,546.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 7,920.4 3,959.0
Equity Securities 0.0 0.0
Other Long-term Investments 0.0 0.0
Assets, Fair Value Disclosure 7,920.4 3,959.0
Liabilities    
Liabilities, Fair Value Disclosure 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 25,122.3 28,930.6
Equity Securities 0.2 0.2
Other Long-term Investments 60.9 52.1
Derivative Assets 60.7 51.9
Assets, Fair Value Disclosure 25,183.2 28,982.7
Liabilities    
Derivative Liabilities 261.0 269.7
Liabilities, Fair Value Disclosure 261.0 269.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Forwards    
Assets, Fair Value Disclosure    
Derivative Assets 1.7 2.4
Liabilities    
Derivative Liabilities 219.4 223.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Foreign Exchange Contracts    
Assets, Fair Value Disclosure    
Derivative Assets 59.0 49.5
Liabilities    
Derivative Liabilities 41.6 45.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 258.1 167.0
Equity Securities 19.8 19.8
Other Long-term Investments 34.6 37.6
Derivative Assets 14.8 17.8
Assets, Fair Value Disclosure 292.7 204.6
Liabilities    
Liabilities, Fair Value Disclosure 0.0 0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Forwards    
Assets, Fair Value Disclosure    
Derivative Assets   0.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Embedded Derivative in Modified Coinsurance Arrangement    
Assets, Fair Value Disclosure    
Derivative Assets 14.8 17.8
Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Equity Securities 0.0 0.0
Other Long-term Investments 1,444.1 1,456.3
Assets, Fair Value Disclosure 1,444.1 1,456.3
Liabilities    
Liabilities, Fair Value Disclosure 0.0 0.0
United States Government and Government Agencies and Authorities    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 544.9 545.0
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 77.7 79.3
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 467.2 465.7
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
United States Government and Government Agencies and Authorities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
States, Municipalities, and Political Subdivisions    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 3,000.0 3,058.1
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 3,000.0 3,058.1
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
States, Municipalities, and Political Subdivisions | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Foreign Governments    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 844.9 870.3
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 844.9 870.3
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Foreign Governments | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Public Utilities    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 5,005.4 4,933.9
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 690.3 223.7
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 4,315.1 4,710.2
Public Utilities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Public Utilities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Mortgage/Asset-backed Securities    
Assets, Fair Value Disclosure    
Fixed Maturity Securities [1] 1,356.9 1,179.3
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 1,159.2 1,076.2
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 197.7 103.1
Mortgage/Asset-backed Securities | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
All Other Corporate Bonds    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 22,540.9 22,462.1
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 7,152.4 3,656.0
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 15,328.1 18,742.2
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 60.4 63.9
All Other Corporate Bonds | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Redeemable Preferred Stocks    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 7.8 7.9
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 7.8 7.9
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Redeemable Preferred Stocks | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Fixed Maturity Securities 0.0 0.0
Private Equity Partnerships    
Assets, Fair Value Disclosure    
Alternative Investments 1,444.1 1,456.3
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets, Fair Value Disclosure    
Alternative Investments 0.0 0.0
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets, Fair Value Disclosure    
Alternative Investments 0.0 0.0
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets, Fair Value Disclosure    
Alternative Investments 0.0 0.0
Private Equity Partnerships | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share    
Assets, Fair Value Disclosure    
Alternative Investments $ 1,444.1 $ 1,456.3
[1]
2Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types
v3.26.1
Changes in Assets and Liabilities Measured at Fair Value on a Recurring Basis using Significant Unobservable Inputs (Level 3) (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Embedded Derivative in Modified Coinsurance Arrangement    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation    
Derivatives Measured with Unobservable Inputs, Beginning Balance $ 17.8 $ 11.5
Derivative Liability Gain (Loss) Included in Earnings (3.0) (1.9)
Derivative Liability Gain (Loss) Included in OCI 0.0 0.0
Derivative Purchases 0.0 0.0
Derivative Sales 0.0 0.0
Derivative Transfers Into Level 3 0.0 0.0
Derivative Transfers Out of Level 3 0.0 0.0
Derivatives Measured with Unobservable Inputs, Ending Balance 14.8 9.6
Fair Value, Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI 0.0 0.0
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) (3.0) (1.9)
Public Utility, Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Assets Measured with Unobservable Inputs, Beginning Balance 0.0 0.0
Investment Gain (Loss) included In Earnings 0.0 (1.5)
Investment Gain (Loss) included in OCI 0.0 1.6
Investment Purchases 0.0 0.0
Investment Sales (10.0) (12.3)
Investment Level 3 Transfers Into 10.0 12.2
Investment Level 3 Transfers Out of 0.0 0.0
Assets Measured with Unobservable Inputs, Ending Balance 0.0 0.0
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in OCI 0.0 0.0
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in Earnings 0.0 0.0
Mortgage/Asset-backed Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Assets Measured with Unobservable Inputs, Beginning Balance 103.1 73.5
Investment Gain (Loss) included In Earnings 0.0 0.0
Investment Gain (Loss) included in OCI 0.6 (0.6)
Investment Purchases 103.4 4.8
Investment Sales (9.5) (0.5)
Investment Level 3 Transfers Into 0.1 0.0
Investment Level 3 Transfers Out of 0.0 0.0
Assets Measured with Unobservable Inputs, Ending Balance 197.7 77.2
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in OCI 0.7 (0.6)
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in Earnings 0.0 0.0
All Other Corporate Bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Assets Measured with Unobservable Inputs, Beginning Balance 63.9 71.5
Investment Gain (Loss) included In Earnings 0.0 (6.2)
Investment Gain (Loss) included in OCI 0.1 (8.3)
Investment Purchases 0.0 0.0
Investment Sales (39.0) (70.3)
Investment Level 3 Transfers Into 82.8 83.8
Investment Level 3 Transfers Out of (47.4) (38.2)
Assets Measured with Unobservable Inputs, Ending Balance 60.4 32.3
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in OCI (0.4) (8.3)
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in Earnings 0.0 0.0
Fixed Maturity Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Assets Measured with Unobservable Inputs, Beginning Balance 167.0 145.0
Investment Gain (Loss) included In Earnings 0.0 (7.7)
Investment Gain (Loss) included in OCI 0.7 (7.3)
Investment Purchases 103.4 4.8
Investment Sales (58.5) (83.1)
Investment Level 3 Transfers Into 92.9 96.0
Investment Level 3 Transfers Out of (47.4) (38.2)
Assets Measured with Unobservable Inputs, Ending Balance 258.1 109.5
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in OCI 0.3 (8.9)
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in Earnings 0.0 0.0
Perpetual Preferred and Equity Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation    
Assets Measured with Unobservable Inputs, Beginning Balance 19.8 24.4
Investment Gain (Loss) included In Earnings 0.0 0.7
Investment Gain (Loss) included in OCI 0.0 0.0
Investment Purchases 0.0 1.7
Investment Sales 0.0 0.0
Investment Level 3 Transfers Into 0.0 0.0
Investment Level 3 Transfers Out of 0.0 0.0
Assets Measured with Unobservable Inputs, Ending Balance 19.8 26.8
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in OCI 0.0 0.0
Change in Unrealized Gain (Loss) on Securities Held at the End of Period Included in Earnings $ 0.0 $ 0.7
v3.26.1
Quantitative Information Regarding Significant Unobservable Inputs (Details)
$ in Millions
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-Sale $ 33,300.8 $ 33,056.6
Equity Securities 20.0 20.0
All Other Corporate Bonds    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-Sale 22,540.9 22,462.1
Fair Value, Inputs, Level 3 | Discounted Cash Flow | Embedded Derivative in Modified Coinsurance Arrangement    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded Derivative, Fair Value of Embedded Derivative Asset [1] $ 14.8 $ 17.8
Fair Value, Inputs, Level 3 | Discounted Cash Flow | Weighted Average | Input Measurement, Spread of Swap Curve | Embedded Derivative in Modified Coinsurance Arrangement    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Embedded Derivative Liability, Measurement Input (0.0034) (0.0041)
Fair Value, Inputs, Level 3 | All Other Corporate Bonds | Market Approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt Securities, Available-for-Sale [2] $ 5.7 $ 8.3
Fair Value, Inputs, Level 3 | Perpetual Preferred and Equity Securities | Market Approach    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Equity Securities [2] $ 19.8 $ 19.8
[1] Represents various actuarial assumptions required to derive the liability cash flows. Fair value of embedded derivative is most often driven by the change in the weighted average credit spread to the swap curve for the assets backing the hypothetical loan
[2] Represents a decision to price based on par value, cost, owner's equity, or the price of the most recent capital funding round when limited data is available
v3.26.1
Fair Values of Financial Instruments Carrying Amounts and Estimated Fair value of Financial Instruments Not Measured at Fair Value (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Mortgage Loans, Carrying Amount [1] $ 2,066.3 $ 2,109.5
Policy Loans 3,702.9 3,668.1
Long-term Debt 3,762.0 3,767.6
Other Liabilities 2,913.1 2,995.8
Liabilities, Fair Value Disclosure 261.0 269.7
Fair Value, Nonrecurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Mortgage Loans, Fair Value Disclosure 1,919.3 1,965.1
Mortgage Loans, Carrying Amount 2,066.3 2,109.5
Policy Loans, Fair Value Disclosure 3,761.7 3,739.5
Policy Loans 3,702.9 3,668.1
Miscellaneous Long-Term Investments, Fair Value Disclosure 42.7 40.9
Miscellaneous Long-Term Investments 42.7 40.9
Financial Instruments, Financial Assets Fair Value Disclosure 5,723.7 5,745.5
Total Financial Instrument Assets Not Carried at Fair Value 5,811.9 5,818.5
Liabilities Related to Investment Contracts, Fair Value Disclosure 106.5  
Long-term Debt, Fair Value Disclosure 3,552.1 3,641.4
Long-term Debt 3,762.0 3,767.6
Other Liabilities, Carrying Value 585.6 644.0
Other Liabilities 585.6 644.0
Liabilities, Fair Value Disclosure 4,244.2 4,285.4
Total Financial Instrument Liabilities Not Carried at Fair Value 4,454.1 4,411.6
Fair Value, Inputs, Level 1 | Fair Value, Nonrecurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Mortgage Loans, Fair Value Disclosure 0.0 0.0
Policy Loans, Fair Value Disclosure 0.0 0.0
Miscellaneous Long-Term Investments, Fair Value Disclosure 0.0 0.0
Financial Instruments, Financial Assets Fair Value Disclosure 0.0 0.0
Liabilities Related to Investment Contracts, Fair Value Disclosure 0.0  
Long-term Debt, Fair Value Disclosure 2,992.7 2,548.2
Other Liabilities 0.0 0.0
Liabilities, Fair Value Disclosure 2,992.7 2,548.2
Fair Value, Inputs, Level 2 | Fair Value, Nonrecurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Mortgage Loans, Fair Value Disclosure 1,919.3 1,965.1
Policy Loans, Fair Value Disclosure 0.0 0.0
Miscellaneous Long-Term Investments, Fair Value Disclosure 42.5 40.7
Financial Instruments, Financial Assets Fair Value Disclosure 1,961.8 2,005.8
Liabilities Related to Investment Contracts, Fair Value Disclosure 106.5  
Long-term Debt, Fair Value Disclosure 559.4 1,093.2
Other Liabilities 585.6 644.0
Liabilities, Fair Value Disclosure 1,251.5 1,737.2
Fair Value, Inputs, Level 3 | Fair Value, Nonrecurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Mortgage Loans, Fair Value Disclosure 0.0 0.0
Policy Loans, Fair Value Disclosure 3,761.7 3,739.5
Miscellaneous Long-Term Investments, Fair Value Disclosure 0.2 0.2
Financial Instruments, Financial Assets Fair Value Disclosure 3,761.9 3,739.7
Liabilities Related to Investment Contracts, Fair Value Disclosure 0.0  
Long-term Debt, Fair Value Disclosure 0.0 0.0
Other Liabilities 0.0 0.0
Liabilities, Fair Value Disclosure $ 0.0 $ 0.0
[1]
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
v3.26.1
Fair Value of Financial Instruments Additional Information (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Ceded Policy Loans $ 3,384.7 $ 3,353.8
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Percentage of Total Fair Value of Fixed Maturities Securities 23.80%  
Fair Value, Inputs, Level 2 | Pricing Service    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Percentage of Total Fair Value of Fixed Maturities Securities 57.50%  
Fair Value, Inputs, Level 2 | Other Observable Market Data    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Percentage of Total Fair Value of Fixed Maturities Securities 17.50%  
Fair Value Inputs Other Than Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Percentage of Total Fair Value of Fixed Maturities Securities 76.20%  
Fair Value Inputs Level 2 Or Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Percentage of Total Fair Value of Fixed Maturities Securities 1.20%  
v3.26.1
Amortized Cost and Fair Values of Securities by Security Type (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale        
Amortized Cost of Fixed Maturity Securities $ 35,530.8 $ 34,747.2    
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities 0.0 5.9    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 620.8 822.0    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,850.8 2,506.7    
Debt Securities, Available-for-sale, Total 33,300.8 33,056.6    
United States Government and Government Agencies and Authorities        
Debt Securities, Available-for-sale        
Amortized Cost of Fixed Maturity Securities 548.9 543.8    
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities 0.0 0.0    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 13.2 17.2    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 17.2 16.0    
Debt Securities, Available-for-sale, Total 544.9 545.0    
States, Municipalities, and Political Subdivisions        
Debt Securities, Available-for-sale        
Amortized Cost of Fixed Maturity Securities 3,413.2 3,450.7    
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities 0.0 0.0    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 61.9 73.8    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 475.1 466.4    
Debt Securities, Available-for-sale, Total 3,000.0 3,058.1    
Foreign Governments        
Debt Securities, Available-for-sale        
Amortized Cost of Fixed Maturity Securities 989.4 1,008.8    
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities 0.0 0.0    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 14.9 18.8    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 159.4 157.3    
Debt Securities, Available-for-sale, Total 844.9 870.3    
Public Utilities        
Debt Securities, Available-for-sale        
Amortized Cost of Fixed Maturity Securities 5,202.3 5,048.6    
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities 0.0 0.0    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 136.8 175.4    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 333.7 290.1    
Debt Securities, Available-for-sale, Total 5,005.4 4,933.9    
Mortgage/Asset-backed Securities        
Debt Securities, Available-for-sale        
Amortized Cost of Fixed Maturity Securities [1] 1,371.9 1,187.3    
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities [1] 0.0 0.0    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 7.7 9.3    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] 22.7 17.3    
Debt Securities, Available-for-sale, Total [1] 1,356.9 1,179.3    
All Other Corporate Bonds        
Debt Securities, Available-for-sale        
Amortized Cost of Fixed Maturity Securities 23,997.1 23,500.0    
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities 0.0 5.9 $ 3.8 $ 2.8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 386.3 527.5    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 1,842.5 1,559.5    
Debt Securities, Available-for-sale, Total 22,540.9 22,462.1    
Redeemable Preferred Stocks        
Debt Securities, Available-for-sale        
Amortized Cost of Fixed Maturity Securities 8.0 8.0    
Debt Securities, Available-for-sale, Allowance for credit losses for Fixed Maturity Securities 0.0 0.0    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0.0 0.0    
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0.2 0.1    
Debt Securities, Available-for-sale, Total $ 7.8 $ 7.9    
[1]
2Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types
v3.26.1
Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 6,713.6 $ 3,333.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 167.7 69.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 14,933.8 15,553.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 2,683.1 2,436.8
United States Government and Government Agencies and Authorities    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 26.2 21.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.6 0.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 233.6 235.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 16.6 15.6
States, Municipalities, and Political Subdivisions    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 162.9 138.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3.4 3.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,907.1 1,922.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 471.7 462.8
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 81.2 264.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1.7 5.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 344.3 318.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 157.7 151.8
Public Utilities    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,048.6 642.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 32.9 19.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,668.0 1,710.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 300.8 270.7
Mortgage/Asset-backed Securities    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months [1] 539.5 206.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss [1] 5.2 0.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer [1] 261.0 275.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss [1] 17.5 16.9
All Other Corporate Bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 4,851.2 2,060.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 123.9 40.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 10,516.0 11,087.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,718.6 1,518.9
Redeemable Preferred Stocks    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 4.0 [2] 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.0 [2] 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 3.8 [2] 3.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 0.2 [2] $ 0.1
[1]
2Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types
[2]
2Includes a de minimis gross unrealized loss for which the length of time has been for less than 12 months
v3.26.1
Investments Distribution of the Maturity Dates for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale, Amortized Cost, Net of Allowance for Credit Losses, Fiscal Year Maturity    
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One, Net $ 1,258.8 $ 1,379.9
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five, Net 6,719.4 6,484.9
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10, Net 7,591.2 7,476.9
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10, Net 18,589.5 18,212.3
Available for sale Securities Debt Maturities Amortized Cost Gross Subtotal, Net 34,158.9 33,554.0
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost, Net [1] 1,371.9 1,187.3
Debt Securities, Available-for-sale, Amortized Cost, Net of Allowance for Credit Losses 35,530.8 34,741.3
Available for Sale Securities Unrealized Gain Position Gross Gain    
Available For Sale Securities Debt Maturities Within One Year Unrealized Gain Position Gross Gain 2.8 3.4
Available For Sale Securities Debt Maturities After One Through Five Years Unrealized Gain Position Gross Gain 150.7 159.7
Available For Sale Securities Debt Maturities After Five Through Ten Years Unrealized Gain Position Gross Gain 177.3 260.3
Available For Sale Securities Debt Maturities After Ten Years Unrealized Gain Position Gross Gain 282.3 389.3
Available For Sale Securities Debt Maturities Unrealized Gain Position Gross Gain Gross Subtotal 613.1 812.7
Available For Sale Securities Debt Maturities Without Single Maturity Date Unrealized Gain Position Gross Gain [1] 7.7 9.3
Available for sale Securities, Debt Maturities Unrealized Gain Position Gross Gain 620.8 822.0
Available for Sale Securities Unrealized Loss Position Gross Loss    
Available For Sale Securities Debt Maturities Within One Year Unrealized Loss Position Gross Loss 5.4 5.1
Available For Sale Securities Debt Maturities After One Through Five Years Unrealized Loss Position Gross Loss 125.2 88.9
Available For Sale Securities Debt Maturities After Five Through Ten Years Unrealized Loss Position Gross Loss 393.3 336.5
Available For Sale Securities Debt Maturities After Ten Years Unrealized Loss Position Gross Loss 2,304.2 2,058.9
Available For Sale Securities Debt Maturities Unrealized Gain Position Gross Loss Gross Subtotal 2,828.1 2,489.4
Available For Sale Securities Debt Maturities Without Single Maturity Date Unrealized Loss Position Gross Loss [1] 22.7 17.3
Available For Sale Securities Unrealized Loss Position Gross Loss Subtotal 2,850.8 2,506.7
Fair Value Maturity Distribution [Abstract]    
Debt Securities, Available-for-sale, Total 33,300.8 33,056.6
Available for Sale Securities Unrealized Gain Position Fair Value    
Fair Value Maturity Distribution [Abstract]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 336.8 430.5
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 3,094.7 3,512.5
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 3,167.3 3,873.6
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value 4,498.2 5,655.9
Available for sale Securities Debt Maturities Fair Value Gross Subtotal 11,097.0 13,472.5
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value [1] 556.4 697.4
Debt Securities, Available-for-sale, Total 11,653.4 14,169.9
Available for Sale Securities Unrealized Loss Position Fair Value    
Fair Value Maturity Distribution [Abstract]    
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value 919.4 947.7
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value 3,650.2 3,043.2
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value 4,207.9 3,527.1
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value 12,069.4 10,886.8
Available for sale Securities Debt Maturities Fair Value Gross Subtotal 20,846.9 18,404.8
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value [1] 800.5 481.9
Debt Securities, Available-for-sale, Total $ 21,647.4 $ 18,886.7
[1]
2Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types
v3.26.1
Investments Distribution by External Credit Rating for Fixed Maturity Securities (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 33,300.8 $ 33,056.6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 620.8 822.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 2,850.8 $ 2,506.7
Fixed maturity securities in unrealized loss position percent of total 100.00%  
External Credit Rating, Investment Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 32,046.8  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 605.8  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 2,784.0  
Fixed maturity securities in unrealized loss position percent of total 97.70%  
External Credit Rating, Below-Investment-Grade    
Debt Securities, Available-for-sale    
Fixed Maturity Securities $ 1,254.0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 15.0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax $ 66.8  
Fixed maturity securities in unrealized loss position percent of total 2.30%  
v3.26.1
Debt Securities, Available-for-sale, Allowance for Credit Losses Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Balance, Beginning of Period $ 5.9  
Balance, End of Period 0.0  
All Other Corporate Bonds    
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]    
Balance, Beginning of Period 5.9 $ 2.8
Credit losses on securities for which credit losses were not previously recorded 0.0 0.9
Debt Securities, Available-for-sale, Allowance for Credit Loss, Sell before Recovery (5.9) 0.0
Change in allowance on securities with allowance recorded in previous period 0.0 0.1
Balance, End of Period $ 0.0 $ 3.8
v3.26.1
Mortgage Loans by Property Type and Geographic Region (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount [1] $ 2,066.3 $ 2,109.5
Mortgage Loans, Percent of Total [1] 100.00% 100.00%
New England    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 49.2 $ 49.9
Mortgage Loans, Percent of Total 2.40% 2.40%
Mid-Atlantic    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 158.0 $ 159.9
Mortgage Loans, Percent of Total 7.60% 7.60%
East North Central    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 270.0 $ 275.3
Mortgage Loans, Percent of Total 13.10% 13.10%
West North Central    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 134.6 $ 135.9
Mortgage Loans, Percent of Total 6.50% 6.40%
South Atlantic    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 499.9 $ 497.2
Mortgage Loans, Percent of Total 24.20% 23.50%
East South Central    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 88.6 $ 96.7
Mortgage Loans, Percent of Total 4.30% 4.60%
West South Central    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 185.8 $ 190.5
Mortgage Loans, Percent of Total 9.00% 9.00%
Mountain    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 235.1 $ 255.3
Mortgage Loans, Percent of Total 11.40% 12.10%
Pacific    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 445.1 $ 448.8
Mortgage Loans, Percent of Total 21.50% 21.30%
Apartment    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 634.0 $ 642.5
Mortgage Loans, Percent of Total 30.70% 30.50%
Industrial    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 650.9 $ 659.0
Mortgage Loans, Percent of Total 31.50% 31.20%
Office    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 283.4 $ 313.3
Mortgage Loans, Percent of Total 13.70% 14.90%
Retail    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 470.4 $ 467.0
Mortgage Loans, Percent of Total 22.80% 22.10%
Other Property    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 27.6 $ 27.7
Mortgage Loans, Percent of Total 1.30% 1.30%
[1]
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
v3.26.1
Schedule of Participating Mortgage Loans by Internal Credit Rating and Loan to Value (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount [1] $ 2,066.3 $ 2,109.5
Mortgage Loans, Percent of Total [1] 100.00% 100.00%
Loan to Value Ratio Below or Equal to 65 Percent    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount [1] $ 1,703.4 $ 1,701.2
Mortgage Loans, Percent of Total [1] 82.50% 80.60%
Loan To Value Ratio Above 65 To 75 Percent    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount [1] $ 151.3 $ 164.3
Mortgage Loans, Percent of Total [1] 7.30% 7.80%
Loan To Value Ratio Above 75 To 85 Percent    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount [1] $ 130.8 $ 162.6
Mortgage Loans, Percent of Total [1] 6.30% 7.70%
Loan To Value Ratio Above 85 Percent    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount [1] $ 80.8 $ 81.4
Mortgage Loans, Percent of Total [1] 3.90% 3.90%
AA Credit Rating    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 128.5 $ 125.6
Mortgage Loans, Percent of Total 6.20% 6.00%
A Credit Rating    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 1,015.7 $ 1,053.4
Mortgage Loans, Percent of Total 49.10% 49.90%
BBB Credit Rating    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 819.3 $ 804.0
Mortgage Loans, Percent of Total 39.70% 38.10%
BB Credit Rating    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 97.0 $ 120.5
Mortgage Loans, Percent of Total 4.70% 5.70%
B Credit Rating    
Mortgage Loans on Real Estate    
Mortgage Loans, Carrying Amount $ 5.8 $ 6.0
Mortgage Loans, Percent of Total 0.30% 0.30%
[1]
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
v3.26.1
Mortgage Loans, Sorted by Applicable Credit Quality Indicators (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Mortgage Loans on Real Estate        
Financing Receivable, Allowance for Credit Losses, Mortgage Loans $ (15.3) $ (15.9)    
Mortgage Loans, Carrying Amount [1] 2,066.3 2,109.5    
Loan to Value Ratio Below or Equal to 65 Percent        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount [1] 1,703.4 1,701.2    
Loan To Value Ratio Above 65 To 75 Percent        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount [1] 151.3 164.3    
Loan To Value Ratio Above 75 To 85 Percent        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount [1] 130.8 162.6    
Loan To Value Ratio Above 85 Percent        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount [1] 80.8 81.4    
Originated Five or More Years before Last Fiscal Year        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount [1] 1,718.6 1,458.9    
Originated Four Years before Last Fiscal Year        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount [1] 84.6 320.7    
Originated Three Years before Last Fiscal Year        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount [1] 65.6 85.1    
Originated Two Years before Last Fiscal Year        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount [1] 45.5 65.8    
Originated in Fiscal Year before Latest Fiscal Year        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount [1] 133.0 45.6    
Originated in Current Fiscal Year        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount [1] 19.0 133.4    
AA Credit Rating        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 128.5 125.6    
A Credit Rating        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 1,015.7 1,053.4    
BBB Credit Rating        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 819.3 804.0    
BB Credit Rating        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 97.0 120.5    
B Credit Rating        
Mortgage Loans on Real Estate        
Mortgage Loans, Carrying Amount 5.8 6.0    
Commercial Real Estate        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year [1] 1,732.4 1,472.4    
Financing Receivable, Originated Four Years before Latest Fiscal Year [1] 84.9 321.6    
Financing Receivable, Originated Three Years before Latest Fiscal Year [1] 65.9 85.4    
Financing Receivable, Originated Two Years before Latest Fiscal Year [1] 45.7 66.2    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year [1] 133.6 45.8    
Financing Receivable, Originated in Current Fiscal Year [1] 19.1 134.0    
Financing Receivable, before Allowance for Credit Loss [1] 2,081.6 2,125.4    
Financing Receivable, Allowance for Credit Losses, Mortgage Loans [1] (15.3) (15.9) $ (16.6) $ (16.1)
Commercial Real Estate | Loan to Value Ratio Below or Equal to 65 Percent        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year [1] 1,486.8 1,264.1    
Financing Receivable, Originated Four Years before Latest Fiscal Year [1] 62.5 238.9    
Financing Receivable, Originated Three Years before Latest Fiscal Year [1] 38.4 63.0    
Financing Receivable, Originated Two Years before Latest Fiscal Year [1] 11.6 38.5    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year [1] 89.1 11.6    
Financing Receivable, Originated in Current Fiscal Year [1] 19.1 89.4    
Financing Receivable, before Allowance for Credit Loss [1] 1,707.5 1,705.5    
Financing Receivable, Allowance for Credit Losses, Mortgage Loans [1] (4.1) (4.3) (3.8) (4.2)
Commercial Real Estate | Loan To Value Ratio Above 65 To 75 Percent        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year [1] 57.8 59.8    
Financing Receivable, Originated Four Years before Latest Fiscal Year [1] 8.4 10.7    
Financing Receivable, Originated Three Years before Latest Fiscal Year [1] 27.5 8.4    
Financing Receivable, Originated Two Years before Latest Fiscal Year [1] 34.1 27.7    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year [1] 24.1 34.2    
Financing Receivable, Originated in Current Fiscal Year [1] 0.0 24.2    
Financing Receivable, before Allowance for Credit Loss [1] 151.9 165.0    
Financing Receivable, Allowance for Credit Losses, Mortgage Loans [1] (0.6) (0.7) (1.7) (1.7)
Commercial Real Estate | Loan To Value Ratio Above 75 To 85 Percent        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year [1] 118.2 115.5    
Financing Receivable, Originated Four Years before Latest Fiscal Year [1] 14.0 35.0    
Financing Receivable, Originated Three Years before Latest Fiscal Year [1] 0.0 14.0    
Financing Receivable, Originated Two Years before Latest Fiscal Year [1] 0.0 0.0    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year [1] 0.0 0.0    
Financing Receivable, Originated in Current Fiscal Year [1] 0.0 0.0    
Financing Receivable, before Allowance for Credit Loss [1] 132.2 164.5    
Financing Receivable, Allowance for Credit Losses, Mortgage Loans [1] (1.4) (1.9) (3.1) (2.2)
Commercial Real Estate | Loan To Value Ratio Above 85 Percent        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year [1] 69.6 33.0    
Financing Receivable, Originated Four Years before Latest Fiscal Year [1] 0.0 37.0    
Financing Receivable, Originated Three Years before Latest Fiscal Year [1] 0.0 0.0    
Financing Receivable, Originated Two Years before Latest Fiscal Year [1] 0.0 0.0    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year [1] 20.4 0.0    
Financing Receivable, Originated in Current Fiscal Year [1] 0.0 20.4    
Financing Receivable, before Allowance for Credit Loss [1] 90.0 90.4    
Financing Receivable, Allowance for Credit Losses, Mortgage Loans [1] (9.2) (9.0) $ (8.0) $ (8.0)
Commercial Real Estate | Originated Five or More Years before Last Fiscal Year        
Mortgage Loans on Real Estate        
Financing Receivable, Allowance for Credit Losses, Mortgage Loans [1] (13.8) (13.5)    
Commercial Real Estate | Originated Four Years before Last Fiscal Year        
Mortgage Loans on Real Estate        
Financing Receivable, Allowance for Credit Losses, Mortgage Loans [1] (0.3) (0.9)    
Commercial Real Estate | Originated Three Years before Last Fiscal Year        
Mortgage Loans on Real Estate        
Financing Receivable, Allowance for Credit Losses, Mortgage Loans [1] (0.3) (0.3)    
Commercial Real Estate | Originated Two Years before Last Fiscal Year        
Mortgage Loans on Real Estate        
Financing Receivable, Allowance for Credit Losses, Mortgage Loans [1] (0.2) (0.4)    
Commercial Real Estate | Originated in Fiscal Year before Latest Fiscal Year        
Mortgage Loans on Real Estate        
Financing Receivable, Allowance for Credit Losses, Mortgage Loans [1] (0.6) (0.2)    
Commercial Real Estate | Originated in Current Fiscal Year        
Mortgage Loans on Real Estate        
Financing Receivable, Allowance for Credit Losses, Mortgage Loans [1] (0.1) (0.6)    
Commercial Real Estate | AA Credit Rating        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 128.6 100.1    
Financing Receivable, Originated Four Years before Latest Fiscal Year 0.0 25.6    
Financing Receivable, Originated Three Years before Latest Fiscal Year 0.0 0.0    
Financing Receivable, Originated Two Years before Latest Fiscal Year 0.0 0.0    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 0.0 0.0    
Financing Receivable, Originated in Current Fiscal Year 0.0 0.0    
Financing Receivable, before Allowance for Credit Loss 128.6 125.7    
Commercial Real Estate | A Credit Rating        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 894.7 794.0    
Financing Receivable, Originated Four Years before Latest Fiscal Year 23.3 144.9    
Financing Receivable, Originated Three Years before Latest Fiscal Year 9.4 23.6    
Financing Receivable, Originated Two Years before Latest Fiscal Year 6.4 9.5    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 76.9 6.4    
Financing Receivable, Originated in Current Fiscal Year 6.8 77.2    
Financing Receivable, before Allowance for Credit Loss 1,017.5 1,055.6    
Commercial Real Estate | BBB Credit Rating        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 617.0 482.4    
Financing Receivable, Originated Four Years before Latest Fiscal Year 61.6 131.2    
Financing Receivable, Originated Three Years before Latest Fiscal Year 56.5 61.8    
Financing Receivable, Originated Two Years before Latest Fiscal Year 39.3 56.7    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 36.3 39.4    
Financing Receivable, Originated in Current Fiscal Year 12.3 36.4    
Financing Receivable, before Allowance for Credit Loss 823.0 807.9    
Commercial Real Estate | BB Credit Rating        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 77.9 81.7    
Financing Receivable, Originated Four Years before Latest Fiscal Year 0.0 19.9    
Financing Receivable, Originated Three Years before Latest Fiscal Year 0.0 0.0    
Financing Receivable, Originated Two Years before Latest Fiscal Year 0.0 0.0    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 20.4 0.0    
Financing Receivable, Originated in Current Fiscal Year 0.0 20.4    
Financing Receivable, before Allowance for Credit Loss 98.3 122.0    
Commercial Real Estate | B Credit Rating        
Mortgage Loans on Real Estate        
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 14.2 14.2    
Financing Receivable, Originated Four Years before Latest Fiscal Year 0.0 0.0    
Financing Receivable, Originated Three Years before Latest Fiscal Year 0.0 0.0    
Financing Receivable, Originated Two Years before Latest Fiscal Year 0.0 0.0    
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 0.0 0.0    
Financing Receivable, Originated in Current Fiscal Year 0.0 0.0    
Financing Receivable, before Allowance for Credit Loss $ 14.2 $ 14.2    
[1]
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
v3.26.1
Mortgage Loans, Allowance for Credit Losses Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Allowance for Credit Loss    
Financing Receivable, Allowance for Credit Loss, Beginning Balance $ 15.9  
Financing Receivable, Allowance for Credit Loss, Ending Balance 15.3  
Commercial Real Estate    
Financing Receivable, Allowance for Credit Loss    
Financing Receivable, Allowance for Credit Loss, Beginning Balance [1] 15.9 $ 16.1
Current Period Provisions [1] (0.6) 0.5
Write-offs [1] 0.0 0.0
Recoveries [1] 0.0 0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance [1] 15.3 16.6
Commercial Real Estate | Loan to Value Ratio Below or Equal to 65 Percent    
Financing Receivable, Allowance for Credit Loss    
Financing Receivable, Allowance for Credit Loss, Beginning Balance [1] 4.3 4.2
Current Period Provisions [1] (0.2) (0.4)
Write-offs [1] 0.0 0.0
Recoveries [1] 0.0 0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance [1] 4.1 3.8
Commercial Real Estate | Loan To Value Ratio Above 65 To 75 Percent    
Financing Receivable, Allowance for Credit Loss    
Financing Receivable, Allowance for Credit Loss, Beginning Balance [1] 0.7 1.7
Current Period Provisions [1] (0.1) 0.0
Write-offs [1] 0.0 0.0
Recoveries [1] 0.0 0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance [1] 0.6 1.7
Commercial Real Estate | Loan To Value Ratio Above 75 To 85 Percent    
Financing Receivable, Allowance for Credit Loss    
Financing Receivable, Allowance for Credit Loss, Beginning Balance [1] 1.9 2.2
Current Period Provisions [1] (0.5) 0.9
Write-offs [1] 0.0 0.0
Recoveries [1] 0.0 0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance [1] 1.4 3.1
Commercial Real Estate | Loan To Value Ratio Above 85 Percent    
Financing Receivable, Allowance for Credit Loss    
Financing Receivable, Allowance for Credit Loss, Beginning Balance [1] 9.0 8.0
Current Period Provisions [1] 0.2 0.0
Write-offs [1] 0.0 0.0
Recoveries [1] 0.0 0.0
Financing Receivable, Allowance for Credit Loss, Ending Balance [1] $ 9.2 $ 8.0
[1]
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
v3.26.1
Investments Remaining Contractual Maturity of Security Lending Agreements (Details) - Overnight and Continuous - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred $ 61.7 $ 76.1
Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement 61.7 76.1
Secured Borrowings, Gross, Difference, Amount 0.0 0.0
US Treasury and Government    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0.3 0.3
Public Utilities    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0.8 4.8
Short-term Investments    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred 0.0 0.1
All Other Corporate Bonds    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings    
Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred $ 60.6 $ 70.9
v3.26.1
Investments Federal Home Loan Bank Carrying Amount, Collateral Posted and Advances Received (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Federal Home Loan Bank Carrying Value of Common Stock, Collateral Posted and Advances    
Federal Home Loan Bank Common Stock $ 42.5 $ 40.7
Federal Home Loan Bank, Advances 691.9 643.8
Federal Home Loan Bank, Collateral Posted to FHLB 1,878.2 1,862.6
Fixed Maturity Securities    
Federal Home Loan Bank Carrying Value of Common Stock, Collateral Posted and Advances    
Federal Home Loan Bank, Collateral Posted to FHLB 800.2 752.4
Commercial Mortgage Loans    
Federal Home Loan Bank Carrying Value of Common Stock, Collateral Posted and Advances    
Federal Home Loan Bank, Collateral Posted to FHLB $ 1,078.0 $ 1,110.2
v3.26.1
Investments Schedule of Financial Instrument and Derivative Offsetting (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Offsetting Derivative Assets [Abstract]    
Net Derivative Assets Reported in Balance Sheet $ 75.5 $ 69.7
Offsetting Securities Loaned    
Gross Securities Loaned 95.7 106.1
Assets Offsetting Securities Loaned in Balance Sheet 0.0 0.0
Net Securities Loaned Reported in Balance Sheet 95.7 106.1
Securities Given as Collateral on Securities Loaned (34.0) (30.0)
Cash Given as Collateral on Securities Loaned (61.7) (76.1)
Securities Loaned, Amount Offset Against Collateral 0.0 0.0
Offsetting Financial Assets    
Gross Financial Assets 156.4 158.0
Financial Liabilities Offsetting Financial Assets in Balance Sheet 0.0 0.0
Net Financial Assets Reported in Balance Sheet 156.4 158.0
Securities Received as Collateral on Financial Assets (94.1) (81.9)
Cash Received as Collateral on Financial Assets (62.2) (76.1)
Financial Assets Net of Collateral 0.1 0.0
Offsetting Derivative Liabilities    
Net Derivative Liabilities Reported in Balance Sheet 261.0 269.7
Offsetting Securities Borrowed    
Gross Securities Borrowed 61.7 76.1
Liabilities Offsetting Securities Borrowed in Balance Sheet 0.0 0.0
Net Securities Borrowed Reported in Balance Sheet 61.7 76.1
Securities Received as Collateral on Securities Borrowed (61.7) (76.1)
Cash Received as Collateral on Securities Borrowed 0.0 0.0
Securities Borrowed Net of Collateral 0.0 0.0
Offsetting Financial Liabilities    
Gross Financial Liability 322.7 345.8
Financial Assets Offsetting Financial Liabilities in Balance Sheet 0.0 0.0
Net Financial Liabilities Reported in Balance Sheet 322.7 345.8
Securities Given as Collateral on Financial Liabilities (322.5) (345.4)
Cash Given as Collateral on Financial Liabilities 0.0 0.0
Financial Liabilities Net of Collateral 0.2 0.4
Over the Counter    
Offsetting Derivative Assets [Abstract]    
Derivative Asset, Fair Value, Gross Asset 60.7 51.9
Derivative Liabilities Offsetting Derivative Assets in Balance Sheet 0.0 0.0
Net Derivative Assets Reported in Balance Sheet 60.7 51.9
Securities Received as Collateral on Derivative Assets (60.1) (51.9)
Cash Collateral from Counterparties (0.5) 0.0
Derivative Assets Net of Collateral 0.1 0.0
Offsetting Derivative Liabilities    
Gross Derivative Liability 261.0 269.7
Derivative Assets Offsetting Derivative Liabilities in Balance Sheet 0.0 0.0
Net Derivative Liabilities Reported in Balance Sheet 261.0 269.7
Securities Given as Collateral on Derivative Liabilities (260.8) (269.3)
Cash Collateral to counterparties 0.0 0.0
Derivative Liabilities Net of Collateral $ 0.2 $ 0.4
v3.26.1
Investments Investment Income (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Net Investment Income    
Gross Investment Income, Operating $ 508.1 $ 537.5
Less Investment Expenses 21.8 21.4
Less Investment Income on PFA Assets 2.9 2.9
Net Investment Income 483.4 513.2
Fixed Maturity Securities    
Net Investment Income    
Gross Investment Income, Operating 425.4 463.3
Derivatives    
Net Investment Income    
Gross Investment Income, Operating 3.6 (4.2)
Mortgage Loans    
Net Investment Income    
Gross Investment Income, Operating 21.6 21.8
Policy Loans    
Net Investment Income    
Gross Investment Income, Operating 5.3 5.2
Perpetual Preferred Securities    
Net Investment Income    
Gross Investment Income, Operating 0.0 0.8
Private Equity Partnerships    
Net Investment Income    
Gross Investment Income, Operating [1] 23.2 18.3
Other Long-term Investments    
Net Investment Income    
Gross Investment Income, Operating 4.2 4.3
Short-term Investments    
Net Investment Income    
Gross Investment Income, Operating $ 24.8 $ 28.0
[1] 1The net unrealized gain recognized in net investment income for the three months ended March 31, 2026 related to private equity partnerships still held at March 31, 2026 was $29.7 million, reduced by net management fees and partnership expenses of $(6.5) million. The net unrealized gain (loss) recognized in net investment income for the three months ended March 31, 2025 related to private equity partnerships still held at March 31, 2025 was $26.4 million, reduced by net management fees and partnership expense of $(8.1) million. See Note 3 for further discussion of private equity partnerships.
v3.26.1
Investment Gains and Losses Reported in Consolidated Statements of Income (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Fixed Maturity Securities    
Gross Gains on Sales $ 1.3 $ 0.6
Gross Losses on sales [1] (1.8) (45.3)
Impairment Loss, Debt Securities, Available-for-sale [2] (8.1) (152.4)
Credit Losses 5.9 (1.0)
Mortgage Loans and Other Invested Assets    
Impairment Loss, Mortgage Loans and Other Invested Assets 0.0 (3.8)
Credit Losses 0.6 (0.4)
Embedded Derivative in Modified Coinsurance Arrangement (3.0) (1.9)
All Other Derivatives 1.5 (5.3)
Foreign Currency Transactions (1.4) 2.7
Net Investment Loss $ (5.0) (206.8)
Commercial Real Estate    
Schedule of Investments    
Financing Receivable, Modified in Period, Amount   $ 14.2
[1]
1During the three months ended March 31, 2025, we recognized a $23.5 million net loss on sales of fixed maturity securities related to the Closed Block long-term care and Unum US individual disability reinsurance transaction (Fortitude Re reinsurance transaction) and a $19.1 million loss on sales of fixed maturity securities related to the funding of an extraordinary dividend from a wholly owned insurance subsidiary to Unum Group.
[2]
2 During the three months ended March 31, 2025, we recognized a $152.4 million impairment loss based on the intent to dispose of fixed maturity securities with a fair value of $1,250.9 million related to the Fortitude Re reinsurance transaction.
v3.26.1
Investments - Additional Information (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2026
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Investments        
Other Long-term Investments $ 1,664.8   $ 1,670.4  
Financing Receivable, Allowance for Credit Losses, Mortgage Loans 15.3   15.9  
Accrued Investment Income 582.0   596.0  
Loan Foreclosure Expense 0.0 $ 0.0    
Commitments to Fund Commercial Mortgage Loans 0.0      
Real Estate Investment Property, Net 40.6   41.7  
Real Estate Held-for-sale $ 41.9   41.9  
Repurchase agreements - Typical Days outstanding 30      
Minimum percent of the fair value of securities loaned or securities purchased under repurchase agreements be maintained as collateral 102.00%      
Gross Securities Loaned $ 95.7   106.1  
Cash Collateral for Borrowed Securities 61.7   76.1  
Securities Received as Collateral 37.6   34.1  
Outstanding Repurchase Agreements 0.0   0.0  
Financing Receivable, Modified, Weighted-Average Term Increase from Modification   24 months    
Line of Credit | FABL Trust        
Schedule of Investments        
Line of Credit Facility, Fair Value of Amount Outstanding 0.0      
Private Equity Partnerships        
Schedule of Investments        
Unrealized Gain (Loss) on Investments 29.7 $ 26.4    
Management Fee Expense (6.5) (8.1)    
Commercial Real Estate        
Schedule of Investments        
Financing Receivable, before Allowance for Credit Loss, Mortgage Loans [1] 2,081.6   2,125.4  
Financing Receivable, Allowance for Credit Losses, Mortgage Loans [1] 15.3 $ 16.6 15.9 $ 16.1
Accrued Investment Income 6.6   6.7  
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0.0   0.0  
Unfunded Mortgage Loan Commitments        
Schedule of Investments        
Allowance for Credit Losses, Unfunded Mortgage Loan Commitments 0.0   0.0  
Variable Interest Entity, Not Primary Beneficiary        
Schedule of Investments        
Other Long-term Investments     $ 1,456.3  
Private Placement Fixed Maturity Security        
Schedule of Investments        
Fair Value Disclosure, off-Balance-Sheet Risks, Amount, Liability 158.9      
Equity Method Investments | Variable Interest Entity, Not Primary Beneficiary        
Schedule of Investments        
Other Long-term Investments $ 1,444.1      
External Credit Rating, Investment Grade        
Schedule of Investments        
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 900      
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 753      
External Credit Rating, Below-Investment-Grade        
Schedule of Investments        
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions 66      
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions 27      
[1]
1Loan-to-Value Ratio utilizes the most recent internal valuation of the property
v3.26.1
Derivative Financial Instruments Nature and Amount of Collateral Received From and Posted To Our Derivative Counterparties (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivative    
Derivative Asset, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset $ 9.6 $ 5.8
Derivative Liability, Subject to Master Netting Arrangement, Deduction of Financial Instrument Not Offset 249.2 244.3
Cash    
Derivative    
Cash Collateral from Counterparties 0.5 1.6
Derivative, Collateral, Right to Reclaim Cash 13.3 0.0
Fixed Maturity Securities    
Derivative    
Carrying Value of Fixed Maturity Securities Posted as Collateral to Counterparties 9.1 4.2
Carrying Value of Fixed Maturity Securities Posted as Collateral to Counterparties $ 235.9 $ 244.3
v3.26.1
Derivative Financial Instruments Fair Value Hedges Carrying Amount of Hedged Assets and Cumulative Basis Adjustments (Details) - Receive Fixed/Pay Fixed - Designated as Hedging Instrument - Fair Value Hedging - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivative Instruments and Hedging Activities Disclosures    
Hedged Asset, Fair Value Hedge $ 683.6 $ 695.0
Hedged Asset, Statement of Financial Position [Extensible Enumeration] Debt Securities, Available-for-Sale Debt Securities, Available-for-Sale
Derivative Instrument by Balance Sheet Location: us-gaap:AvailableForSaleSecuritiesDebtSecurities    
Derivative Instruments and Hedging Activities Disclosures    
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) $ 17.7 $ 24.7
hedged asset, amortized cost $ 799.8 $ 793.4
v3.26.1
Location and Amounts of Derivative Financial Instruments (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Derivative    
Derivative, Notional Amount $ 3,769.4 $ 3,818.2
Derivative Instrument by Balance Sheet Location: us-gaap:OtherLiabilities    
Derivative    
Liability Derivatives Fair Value 261.0 269.7
Derivative Instrument by Balance Sheet Location: us-gaap:OtherLongTermInvestments    
Derivative    
Asset Derivatives Fair Value 75.5 69.7
Designated as Hedging Instrument    
Derivative    
Derivative, Notional Amount 3,468.6 3,498.9
Designated as Hedging Instrument | Cash Flow Hedging    
Derivative    
Derivative, Notional Amount 2,646.0 2,730.3
Designated as Hedging Instrument | Interest Rate Swaps | Cash Flow Hedging    
Derivative    
Derivative, Notional Amount 120.0 127.3
Designated as Hedging Instrument | Interest Rate Swaps | Fair Value Hedging    
Derivative    
Derivative, Notional Amount 822.6 768.6
Designated as Hedging Instrument | Forward Benchmark Interest Rate Lock | Cash Flow Hedging    
Derivative    
Derivative, Notional Amount 2,526.0 2,603.0
Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLiabilities    
Derivative    
Liability Derivatives Fair Value 246.7 253.6
Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLiabilities | Cash Flow Hedging    
Derivative    
Liability Derivatives Fair Value 219.8 224.6
Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLiabilities | Interest Rate Swaps | Cash Flow Hedging    
Derivative    
Liability Derivatives Fair Value 1.1 1.7
Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLiabilities | Interest Rate Swaps | Fair Value Hedging    
Derivative    
Liability Derivatives Fair Value 26.9 29.0
Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLiabilities | Forward Benchmark Interest Rate Lock | Cash Flow Hedging    
Derivative    
Liability Derivatives Fair Value 218.7 222.9
Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLongTermInvestments    
Derivative    
Asset Derivatives Fair Value 59.7 51.6
Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLongTermInvestments | Cash Flow Hedging    
Derivative    
Asset Derivatives Fair Value 15.2 16.6
Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLongTermInvestments | Interest Rate Swaps | Cash Flow Hedging    
Derivative    
Asset Derivatives Fair Value 14.3 14.3
Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLongTermInvestments | Interest Rate Swaps | Fair Value Hedging    
Derivative    
Asset Derivatives Fair Value 44.5 35.0
Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLongTermInvestments | Forward Benchmark Interest Rate Lock | Cash Flow Hedging    
Derivative    
Asset Derivatives Fair Value 0.9 2.3
Not Designated as Hedging Instrument    
Derivative    
Derivative, Notional Amount 300.8 319.3
Not Designated as Hedging Instrument | Interest Rate Swaps    
Derivative    
Derivative, Notional Amount 102.3 115.6
Not Designated as Hedging Instrument | Total Return Swap    
Derivative    
Derivative, Notional Amount 151.4 154.8
Not Designated as Hedging Instrument | Embedded Derivative in Modified Coinsurance Arrangement    
Derivative    
Derivative, Notional Amount 0.0 0.0
Not Designated as Hedging Instrument | Foreign Exchange Forward    
Derivative    
Derivative, Notional Amount 47.1 48.9
Not Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLiabilities    
Derivative    
Liability Derivatives Fair Value 14.3 16.1
Not Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLiabilities | Interest Rate Swaps    
Derivative    
Liability Derivatives Fair Value 13.6 15.1
Not Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLiabilities | Total Return Swap    
Derivative    
Liability Derivatives Fair Value 0.0 0.0
Not Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLiabilities | Embedded Derivative in Modified Coinsurance Arrangement    
Derivative    
Liability Derivatives Fair Value 0.0 0.0
Not Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLiabilities | Foreign Exchange Forward    
Derivative    
Liability Derivatives Fair Value 0.7 1.0
Not Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLongTermInvestments    
Derivative    
Asset Derivatives Fair Value 15.8 18.1
Not Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLongTermInvestments | Interest Rate Swaps    
Derivative    
Asset Derivatives Fair Value 0.2 0.2
Not Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLongTermInvestments | Total Return Swap    
Derivative    
Asset Derivatives Fair Value 0.0 0.0
Not Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLongTermInvestments | Embedded Derivative in Modified Coinsurance Arrangement    
Derivative    
Asset Derivatives Fair Value 14.8 17.8
Not Designated as Hedging Instrument | Derivative Instrument by Balance Sheet Location: us-gaap:OtherLongTermInvestments | Foreign Exchange Forward    
Derivative    
Asset Derivatives Fair Value $ 0.8 $ 0.1
v3.26.1
Derivative Financial Instruments Location of Gains and Losses Designated as Hedging Instruments, Consolidated Statements of Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Derivative Instruments, Gain (Loss)    
Net Investment Income $ 483.4 $ 513.2
Net Investment Gain (Loss) (5.0) (206.8)
Interest and Debt Expense 53.1 52.0
Net Gain (Loss) on Derivatives 1.5 (5.3)
Designated as Hedging Instrument | Interest Rate Swaps | Income Statement Location: us-gaap:GainLossOnInvestments | Cash Flow Hedging    
Derivative Instruments, Gain (Loss)    
Net Investment Gain (Loss) 0.0 (0.4)
Net Gain (Loss) on Derivatives 0.0 0.4
Designated as Hedging Instrument | Interest Rate Swaps | Income Statement Location: us-gaap:InterestAndDebtExpense | Cash Flow Hedging    
Derivative Instruments, Gain (Loss)    
Interest and Debt Expense 0.7 0.7
Net Gain (Loss) on Derivatives 0.0 0.0
Designated as Hedging Instrument | Interest Rate Swaps | Income Statement Location: us-gaap:NetInvestmentIncome | Cash Flow Hedging    
Derivative Instruments, Gain (Loss)    
Net Investment Income 10.8 17.4
Net Gain (Loss) on Derivatives 1.3 2.6
Designated as Hedging Instrument | Foreign Exchange Contracts | Income Statement Location: us-gaap:GainLossOnInvestments | Cash Flow Hedging    
Derivative Instruments, Gain (Loss)    
Net Investment Gain (Loss) (1.5) 0.0
Net Gain (Loss) on Derivatives 1.0 0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Income Statement Location: us-gaap:GainLossOnInvestments | Fair Value Hedging    
Derivative Instruments, Gain (Loss)    
Net Investment Gain (Loss) (7.0) 21.5
Net Gain (Loss) on Derivatives 7.0 (21.5)
Designated as Hedging Instrument | Foreign Exchange Contracts | Income Statement Location: us-gaap:InterestAndDebtExpense | Cash Flow Hedging    
Derivative Instruments, Gain (Loss)    
Interest and Debt Expense 0.0 0.0
Net Gain (Loss) on Derivatives 0.0 0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Income Statement Location: us-gaap:InterestAndDebtExpense | Fair Value Hedging    
Derivative Instruments, Gain (Loss)    
Interest and Debt Expense 0.0 0.0
Net Gain (Loss) on Derivatives 0.0 0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Income Statement Location: us-gaap:NetInvestmentIncome | Cash Flow Hedging    
Derivative Instruments, Gain (Loss)    
Net Investment Income 1.8 2.3
Net Gain (Loss) on Derivatives 0.1 (0.7)
Designated as Hedging Instrument | Foreign Exchange Contracts | Income Statement Location: us-gaap:NetInvestmentIncome | Fair Value Hedging    
Derivative Instruments, Gain (Loss)    
Net Investment Income 5.9 4.4
Net Gain (Loss) on Derivatives 2.8 (5.2)
Designated as Hedging Instrument | Forward Benchmark Interest Rate Lock | Income Statement Location: us-gaap:GainLossOnInvestments | Cash Flow Hedging    
Derivative Instruments, Gain (Loss)    
Net Investment Gain (Loss) 0.0 0.0
Net Gain (Loss) on Derivatives 0.0 0.0
Designated as Hedging Instrument | Forward Benchmark Interest Rate Lock | Income Statement Location: us-gaap:InterestAndDebtExpense | Cash Flow Hedging    
Derivative Instruments, Gain (Loss)    
Interest and Debt Expense 0.0 0.0
Net Gain (Loss) on Derivatives 0.0 0.0
Designated as Hedging Instrument | Forward Benchmark Interest Rate Lock | Income Statement Location: us-gaap:NetInvestmentIncome | Cash Flow Hedging    
Derivative Instruments, Gain (Loss)    
Net Investment Income 16.7 12.3
Net Gain (Loss) on Derivatives $ (0.5) $ (0.4)
v3.26.1
Location of Gains and Losses on Derivative Instruments Designated as Cash Flow Hedging Instruments (Detail) - Designated as Hedging Instrument - Cash Flow Hedging - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives $ (8.4) $ 32.5
Forward Benchmark Interest Rate Lock    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives (8.9) 31.5
Foreign Exchange Contracts    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Other Comprehensive Income (Loss) on Derivatives $ 0.5 $ 1.0
v3.26.1
Gains and Losses on Derivatives Not Designated as Hedging Instruments (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Derivative Instruments, Gain (Loss)    
Net Gain (Loss) on Derivatives $ 1.5 $ (5.3)
Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss)    
Net Gain (Loss) on Derivatives (1.5) (7.1)
Foreign Exchange Contracts | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss)    
Net Gain (Loss) on Derivatives 1.5 (2.0)
Embedded Derivative in Modified Coinsurance Arrangement | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss)    
Net Gain (Loss) on Derivatives (3.0) (1.9)
Total Return Swap | Not Designated as Hedging Instrument | Income Statement Location: us-gaap:GainLossOnInvestments    
Derivative Instruments, Gain (Loss)    
Net Gain (Loss) on Derivatives 0.0 (3.2)
Total Return Swap | Not Designated as Hedging Instrument | Income Statement Location: us-gaap:NetInvestmentIncome    
Derivative Instruments, Gain (Loss)    
Net Gain (Loss) on Derivatives 0.0 0.1
Total Return Swap | Not Designated as Hedging Instrument | Income Statement Location: us-gaap:OtherCostAndExpenseOperating    
Derivative Instruments, Gain (Loss)    
Net Gain (Loss) on Derivatives $ 5.6 $ 4.3
v3.26.1
Derivative Financial Instruments - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Derivative      
Aggregate fair value of all derivative instruments with credit risk-related contingent features in a liability position $ 261.0   $ 269.7
Derivative, Notional Amount 3,769.4   3,818.2
Approximate amount of net deferred gains on derivative instruments expected to be amortized during the next twelve months 1.8    
Component of Derivative Gain (Loss) Excluded from the Assessment of Hedge Effectiveness 4.7 $ 27.2  
Discontinued Hedge Accounting Due to Instrument No Longer Qualifying as Fair Value Hedge $ 0.0 $ 0.0  
Cash Flow Hedge, Hedging Exposure, Maximum Period 27 years    
Designated as Hedging Instrument      
Derivative      
Derivative, Notional Amount $ 3,468.6   3,498.9
Not Designated as Hedging Instrument      
Derivative      
Derivative, Notional Amount 300.8   319.3
Cash Flow Hedging | Designated as Hedging Instrument      
Derivative      
Derivative, Notional Amount 2,646.0   2,730.3
Interest Rate Swaps | Not Designated as Hedging Instrument      
Derivative      
Derivative, Notional Amount 102.3   115.6
Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument      
Derivative      
Derivative, Notional Amount 120.0   127.3
Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument      
Derivative      
Derivative, Notional Amount 822.6   768.6
Total Return Swap | Not Designated as Hedging Instrument      
Derivative      
Derivative, Notional Amount 151.4   154.8
Total Return Swap | Not Designated as Hedging Instrument | Fair Value Volatility      
Derivative      
Derivative, Notional Amount 151.4   154.8
Total Return Swap | Not Designated as Hedging Instrument | Credit Spreads and Interest Rate Volatility      
Derivative      
Derivative, Notional Amount 0.0   700.0
Forward Benchmark Interest Rate Lock | Cash Flow Hedging | Designated as Hedging Instrument      
Derivative      
Derivative, Notional Amount 2,526.0   2,603.0
Foreign Exchange Forward | Not Designated as Hedging Instrument      
Derivative      
Derivative, Notional Amount 47.1   48.9
Receive Fixed/Pay Fixed | Interest Rate Swaps | Not Designated as Hedging Instrument      
Derivative      
Derivative, Notional Amount 102.3   115.6
Receive Fixed/Pay Fixed | Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument      
Derivative      
Derivative, Notional Amount 120.0   127.3
Receive Fixed/Pay Fixed | Interest Rate Swaps | Fair Value Hedging | Designated as Hedging Instrument      
Derivative      
Derivative, Notional Amount 822.6   768.6
Credit Exposure      
Derivative      
Credit Exposure on Derivatives $ 0.1   $ 0.0
v3.26.1
Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Accumulated Other Comprehensive Loss    
Balance at Beginning of Period $ (1,808.5) $ (2,523.7)
Other Comprehensive Income (Loss) Before Reclassifications 10.1 187.3
Amounts Reclassified from AOCI (2.9) (157.6)
Total Other Comprehensive Income 13.0 344.9
Balance at End of Period (1,795.5) (2,178.8)
Net Unrealized Loss on Securities    
Accumulated Other Comprehensive Loss    
Balance at Beginning of Period (2,003.1) (2,755.2)
Other Comprehensive Income (Loss) Before Reclassifications (431.3) 265.6
Amounts Reclassified from AOCI (2.1) (156.4)
Total Other Comprehensive Income (429.2) 422.0
Balance at End of Period (2,432.3) (2,333.2)
Effect of Change in Discount Rate Assumptions on the LFPB1    
Accumulated Other Comprehensive Loss    
Balance at Beginning of Period 929.9 1,185.4
Other Comprehensive Income (Loss) Before Reclassifications 465.2 (166.3)
Amounts Reclassified from AOCI 0.0 0.0
Total Other Comprehensive Income 465.2 (166.3)
Balance at End of Period 1,395.1 1,019.1
Net Loss on Derivatives    
Accumulated Other Comprehensive Loss    
Balance at Beginning of Period (278.8) (270.7)
Other Comprehensive Income (Loss) Before Reclassifications (2.0) 47.5
Amounts Reclassified from AOCI 1.3 2.0
Total Other Comprehensive Income (3.3) 45.5
Balance at End of Period (282.1) (225.2)
Foreign Currency Translation Adjustment    
Accumulated Other Comprehensive Loss    
Balance at Beginning of Period (245.6) (343.0)
Other Comprehensive Income (Loss) Before Reclassifications (23.0) 42.3
Amounts Reclassified from AOCI 0.0 0.0
Total Other Comprehensive Income (23.0) 42.3
Balance at End of Period (268.6) (300.7)
Unrecognized Pension and Postretirement Benefit Costs    
Accumulated Other Comprehensive Loss    
Balance at Beginning of Period (210.9) (340.2)
Other Comprehensive Income (Loss) Before Reclassifications 1.2 (1.8)
Amounts Reclassified from AOCI (2.1) (3.2)
Total Other Comprehensive Income 3.3 1.4
Balance at End of Period $ (207.6) $ (338.8)
v3.26.1
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Net Investment Loss $ (5.0) $ (206.8)
Impairment Loss, Debt Securities, Available-for-sale [1] (8.1) (152.4)
Credit Losses (5.9) 1.0
Net Investment Income 483.4 513.2
Other Expenses (357.8) (318.6)
Income Tax Expense (Benefit) 70.7 54.5
Net Income 232.0 189.1
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Net Unrealized Loss on Securities    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Net Investment Loss (0.5) (44.7)
Impairment Loss, Debt Securities, Available-for-sale (8.1) (152.4)
Credit Losses (5.9) 1.0
Income Before Income Tax (2.7) (198.1)
Income Tax Expense (Benefit) (0.6) (41.7)
Net Income (2.1) (156.4)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Net Loss on Derivatives    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Income Before Income Tax 1.7 2.5
Income Tax Expense (Benefit) 0.4 0.5
Net Income 1.3 2.0
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Net Loss on Derivatives | Interest Rate Swaps    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Net Investment Loss 0.0 0.4
Net Investment Income 0.8 2.2
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Net Loss on Derivatives | Foreign Exchange Contracts    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Net Investment Loss 0.9 (0.1)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Amortization of Net Actuarial Loss    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Other Expenses 2.7 4.1
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Amortization of Prior Service Credit    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Other Expenses (0.1) (0.1)
Reclassification out of Accumulated Other Comprehensive Income (Loss) | Unrecognized Pension and Postretirement Benefit Costs    
Reclassification Adjustment out of Accumulated Other Comprehensive Income    
Income Before Income Tax (2.6) (4.0)
Income Tax Expense (Benefit) (0.5) (0.8)
Net Income $ (2.1) $ (3.2)
[1]
2 During the three months ended March 31, 2025, we recognized a $152.4 million impairment loss based on the intent to dispose of fixed maturity securities with a fair value of $1,250.9 million related to the Fortitude Re reinsurance transaction.
v3.26.1
Liability for Future Policy Benefit Activity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Foreign currency $ (63.9) $ 103.6    
Expected future benefit payments 101,887.4 103,072.4    
Expected future gross premiums 39,799.3 39,765.5    
Expected future gross premiums $ 26,452.4 $ 26,189.2    
Interest accretion rate 5.00% 4.90%    
Weighted average duration of the liability 11 years 1 month 6 days 11 years 4 months 24 days    
Future Policy Benefits $ 37,300.5   $ 38,017.0  
Unum US        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present Value of Expected Net Premiums, Balance at beginning of year 2,622.0 $ 2,442.7    
Beginning balance at original discount rate 2,679.8 2,566.0    
Effect of changes in cash flow assumptions     0.0 $ 0.0
Effect of actual variances from expected experience     (46.0) (103.1)
Adjusted beginning of year balance     2,633.8 2,462.9
Issuances 343.8 344.1    
Interest accretion 26.6 25.4    
Net premiums collected (115.4) (105.3)    
Ending balance at original discount rate 2,888.8 2,727.1    
Effect of change in discount rate assumptions (89.4) (93.5)    
Present Value of Expected Net Premiums, balance at end of period 2,799.4 2,633.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits, beginning of year 11,067.3 11,030.0    
Beginning balance at original discount rate 11,365.9 11,565.8    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (75.9) (178.8)
Adjusted beginning of year balance     11,290.0 11,387.0
Issuances 956.7 [1] 970.7 [2]    
Interest accretion 108.5 111.6    
Benefit payments (815.6) (822.0)    
Ending balance at original discount rate 11,539.6 11,647.3    
Effect of change in discount rate assumptions (428.6) (432.2)    
Balance, end of period 11,111.0 11,215.1    
Net liability for future policy benefits 8,311.6 8,581.5    
Other 32.2 29.6    
Total liability for future policy benefits 8,343.8 8,611.1    
Less: Reinsurance recoverable related to future policy benefits 418.6 118.4    
Net liability for future policy benefits, after reinsurance recoverable 7,925.2 8,492.7    
Gross premiums or assessments 1,786.0 1,690.6    
Interest accretion 81.9 86.2    
Expected future benefit payments 17,746.6 17,799.0    
Expected future gross premiums 12,699.7 12,138.2    
Expected future gross premiums $ 8,595.9 $ 8,303.2    
Interest accretion rate 4.40% 4.30%    
Current discount rate 4.70% 4.70%    
Weighted average duration of the liability 7 years 7 years 1 month 6 days    
Future Policy Benefits [3] $ 8,343.8 $ 8,611.1    
Unum International        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present Value of Expected Net Premiums, Balance at beginning of year 352.8 276.1    
Beginning balance at original discount rate 378.0 314.2    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (1.4) 1.1
Adjusted beginning of year balance     376.6 315.3
Issuances 11.4 8.3    
Interest accretion 3.7 3.0    
Net premiums collected (9.4) (7.8)    
Foreign currency (12.7) 21.2    
Ending balance at original discount rate 369.6 340.0    
Effect of change in discount rate assumptions (41.5) (37.5)    
Present Value of Expected Net Premiums, balance at end of period 328.1 302.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits, beginning of year 2,699.0 2,391.6    
Beginning balance at original discount rate 2,923.4 2,641.5    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (3.7) (7.3)
Adjusted beginning of year balance     2,919.7 2,634.2
Issuances [4] 138.4 117.6    
Interest accretion 19.9 17.5    
Benefit payments (158.3) (138.9)    
Ending balance at original discount rate 2,855.8 2,734.0    
Effect of change in discount rate assumptions (337.4) (266.5)    
Balance, end of period 2,518.4 2,467.5    
Net liability for future policy benefits 2,190.3 2,165.0    
Other 49.5 45.8    
Total liability for future policy benefits 2,239.8 2,210.8    
Less: Reinsurance recoverable related to future policy benefits 71.4 68.7    
Net liability for future policy benefits, after reinsurance recoverable 2,168.4 2,142.1    
Gross premiums or assessments 287.3 241.3    
Interest accretion 16.2 14.5    
Expected future benefit payments 4,627.9 4,431.6    
Expected future gross premiums 1,631.1 1,419.2    
Expected future gross premiums $ 1,011.5 $ 895.9    
Interest accretion rate 4.20% 4.10%    
Current discount rate 5.50% 5.20%    
Weighted average duration of the liability 8 years 8 months 12 days 8 years 10 months 24 days    
Future Policy Benefits [3] $ 2,239.8 $ 2,210.8    
Colonial Life        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present Value of Expected Net Premiums, Balance at beginning of year 3,709.0 3,553.3    
Beginning balance at original discount rate 3,850.9 3,793.8    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (13.5) (11.3)
Adjusted beginning of year balance     3,837.4 3,782.5
Issuances 174.6 149.8    
Interest accretion 37.1 36.8    
Net premiums collected (168.8) (165.2)    
Ending balance at original discount rate 3,880.3 3,803.9    
Effect of change in discount rate assumptions (182.4) (198.8)    
Present Value of Expected Net Premiums, balance at end of period 3,697.9 3,605.1    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits, beginning of year 5,710.4 5,434.9    
Beginning balance at original discount rate 6,179.4 6,026.2    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (25.8) (20.0)
Adjusted beginning of year balance     6,153.6 6,006.2
Issuances 182.7 157.3    
Interest accretion 61.9 60.5    
Benefit payments (170.0) (168.1)    
Ending balance at original discount rate 6,228.2 6,055.9    
Effect of change in discount rate assumptions (546.1) (531.4)    
Balance, end of period 5,682.1 5,524.5    
Net liability for future policy benefits 1,984.2 1,919.4    
Other 29.3 24.7    
Total liability for future policy benefits 2,013.5 1,944.1    
Less: Reinsurance recoverable related to future policy benefits 1.5 1.0    
Net liability for future policy benefits, after reinsurance recoverable 2,012.0 1,943.1    
Gross premiums or assessments 457.1 442.0    
Interest accretion 24.8 23.7    
Expected future benefit payments 11,231.7 10,537.5    
Expected future gross premiums 13,374.6 12,748.0    
Expected future gross premiums $ 9,425.7 $ 9,110.3    
Interest accretion rate 4.40% 4.40%    
Current discount rate 5.50% 5.30%    
Weighted average duration of the liability 17 years 7 months 6 days 17 years 3 months 18 days    
Future Policy Benefits $ 2,013.5 $ 1,944.1    
Closed Block        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present Value of Expected Net Premiums, Balance at beginning of year 7,732.7 7,658.5    
Beginning balance at original discount rate 7,484.3 7,592.9    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (174.1) (69.9)
Adjusted beginning of year balance     7,310.2 7,523.0
Interest accretion 95.1 98.0    
Net premiums collected (161.7) (157.1)    
Ending balance at original discount rate 7,243.6 7,463.9    
Effect of change in discount rate assumptions 124.3 148.4    
Present Value of Expected Net Premiums, balance at end of period 7,367.9 7,612.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits, beginning of year 31,206.4 30,063.6    
Beginning balance at original discount rate 31,169.8 30,544.7    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (69.0) (82.9)
Adjusted beginning of year balance     31,100.8 30,461.8
Issuances 22.9 [5] 26.9 [6]    
Interest accretion 392.2 383.1    
Benefit payments (497.2) (489.7)    
Ending balance at original discount rate 31,018.7 30,382.1    
Effect of change in discount rate assumptions (553.3) (192.8)    
Balance, end of period 30,465.4 30,189.3    
Net liability for future policy benefits 23,097.5 22,577.0    
Other 1,417.9 1,479.9    
Total liability for future policy benefits 24,515.4 24,056.9    
Less: Reinsurance recoverable related to future policy benefits 9,548.6 6,700.1    
Net liability for future policy benefits, after reinsurance recoverable 14,966.8 17,356.8    
Gross premiums or assessments 212.4 218.2    
Interest accretion 297.1 285.1    
Expected future benefit payments 68,281.2 70,304.3    
Expected future gross premiums 12,093.9 13,460.1    
Expected future gross premiums $ 7,419.3 $ 7,879.8    
Interest accretion rate 5.30% 5.30%    
Current discount rate 5.60% 5.40%    
Weighted average duration of the liability 12 years 2 months 12 days 12 years 9 months 18 days    
Future Policy Benefits [3] $ 24,515.4 $ 24,056.9    
Other Products        
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Future Policy Benefits [3] 188.0 207.8    
Group Disability | Unum US        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present Value of Expected Net Premiums, Balance at beginning of year 0.0 0.0    
Beginning balance at original discount rate 0.0 0.0    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     0.0 0.0
Adjusted beginning of year balance     0.0 0.0
Issuances 0.0 0.0    
Interest accretion 0.0 0.0    
Net premiums collected 0.0 0.0    
Ending balance at original discount rate 0.0 0.0    
Effect of change in discount rate assumptions 0.0 0.0    
Present Value of Expected Net Premiums, balance at end of period 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits, beginning of year 4,588.1 4,735.8    
Beginning balance at original discount rate 4,656.9 4,907.5    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (16.0) (45.3)
Adjusted beginning of year balance     4,640.9 4,862.2
Issuances 406.1 [1] 410.6 [2]    
Interest accretion 38.6 42.1    
Benefit payments (460.1) (452.4)    
Ending balance at original discount rate 4,625.5 4,862.5    
Effect of change in discount rate assumptions (105.5) (133.9)    
Balance, end of period 4,520.0 4,728.6    
Net liability for future policy benefits 4,520.0 4,728.6    
Other 0.1 0.2    
Total liability for future policy benefits 4,520.1 4,728.8    
Less: Reinsurance recoverable related to future policy benefits 23.8 25.5    
Net liability for future policy benefits, after reinsurance recoverable 4,496.3 4,703.3    
Gross premiums or assessments 814.6 779.6    
Interest accretion 38.6 42.1    
Expected future benefit payments 5,571.5 5,862.0    
Expected future gross premiums 0.0 0.0    
Expected future gross premiums $ 0.0 $ 0.0    
Interest accretion rate 4.30% 4.20%    
Current discount rate 4.70% 4.70%    
Weighted average duration of the liability 3 years 10 months 24 days 4 years 1 month 6 days    
Group Life and AD&D | Unum US        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present Value of Expected Net Premiums, Balance at beginning of year $ 0.0 $ 0.0    
Beginning balance at original discount rate 0.0 0.0    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     0.0 0.0
Adjusted beginning of year balance     0.0 0.0
Issuances 0.0 0.0    
Interest accretion 0.0 0.0    
Net premiums collected 0.0 0.0    
Ending balance at original discount rate 0.0 0.0    
Effect of change in discount rate assumptions 0.0 0.0    
Present Value of Expected Net Premiums, balance at end of period 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits, beginning of year 801.6 835.2    
Beginning balance at original discount rate 807.5 852.6    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (21.9) (20.9)
Adjusted beginning of year balance     785.6 831.7
Issuances 194.2 [1] 203.6 [2]    
Interest accretion 4.5 4.8    
Benefit payments (195.9) (220.9)    
Ending balance at original discount rate 788.4 819.2    
Effect of change in discount rate assumptions (10.1) (13.2)    
Balance, end of period 778.3 806.0    
Net liability for future policy benefits 778.3 806.0    
Other 0.9 0.8    
Total liability for future policy benefits 779.2 806.8    
Less: Reinsurance recoverable related to future policy benefits 7.3 6.2    
Net liability for future policy benefits, after reinsurance recoverable 771.9 800.6    
Gross premiums or assessments 556.5 520.3    
Interest accretion 4.5 4.8    
Expected future benefit payments 891.3 930.0    
Expected future gross premiums 0.0 0.0    
Expected future gross premiums $ 0.0 $ 0.0    
Interest accretion rate 2.40% 2.40%    
Current discount rate 2.70% 2.70%    
Weighted average duration of the liability 2 years 3 months 18 days 2 years 6 months    
Voluntary Benefits | Unum US        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present Value of Expected Net Premiums, Balance at beginning of year $ 1,385.5 $ 1,240.2    
Beginning balance at original discount rate 1,447.3 1,335.3    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (39.7) (55.1)
Adjusted beginning of year balance     1,407.6 1,280.2
Issuances 292.4 250.7    
Interest accretion 13.5 12.4    
Net premiums collected (66.7) (58.2)    
Ending balance at original discount rate 1,646.8 1,485.1    
Effect of change in discount rate assumptions (78.1) (78.6)    
Present Value of Expected Net Premiums, balance at end of period 1,568.7 1,406.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits, beginning of year 2,536.9 2,362.5    
Beginning balance at original discount rate 2,751.1 2,614.6    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (40.9) (58.1)
Adjusted beginning of year balance     2,710.2 2,556.5
Issuances 303.5 [1] 260.8 [2]    
Interest accretion 28.9 27.7    
Benefit payments (84.1) (74.2)    
Ending balance at original discount rate 2,958.5 2,770.8    
Effect of change in discount rate assumptions (254.7) (229.2)    
Balance, end of period 2,703.8 2,541.6    
Net liability for future policy benefits 1,135.1 1,135.1    
Other 4.6 2.8    
Total liability for future policy benefits 1,139.7 1,137.9    
Less: Reinsurance recoverable related to future policy benefits 13.0 13.3    
Net liability for future policy benefits, after reinsurance recoverable 1,126.7 1,124.6    
Gross premiums or assessments 240.4 219.9    
Interest accretion 15.4 15.3    
Expected future benefit payments 6,188.6 5,868.6    
Expected future gross premiums 6,887.3 6,325.6    
Expected future gross premiums $ 4,404.1 $ 4,121.9    
Interest accretion rate 5.00% 5.00%    
Current discount rate 5.70% 5.50%    
Weighted average duration of the liability 18 years 2 months 12 days 18 years 4 months 24 days    
Individual Disability | Unum US        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present Value of Expected Net Premiums, Balance at beginning of year $ 1,236.5 $ 1,202.5    
Beginning balance at original discount rate 1,232.5 1,230.7    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (6.3) (48.0)
Adjusted beginning of year balance     1,226.2 1,182.7
Issuances 51.4 93.4    
Interest accretion 13.1 13.0    
Net premiums collected (48.7) (47.1)    
Ending balance at original discount rate 1,242.0 1,242.0    
Effect of change in discount rate assumptions (11.3) (14.9)    
Present Value of Expected Net Premiums, balance at end of period 1,230.7 1,227.1    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits, beginning of year 3,140.7 3,096.5    
Beginning balance at original discount rate 3,150.4 3,191.1    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     2.9 (54.5)
Adjusted beginning of year balance     3,153.3 3,136.6
Issuances 52.9 [1] 95.7 [2]    
Interest accretion 36.5 37.0    
Benefit payments (75.5) (74.5)    
Ending balance at original discount rate 3,167.2 3,194.8    
Effect of change in discount rate assumptions (58.3) (55.9)    
Balance, end of period 3,108.9 3,138.9    
Net liability for future policy benefits 1,878.2 1,911.8    
Other 26.6 25.8    
Total liability for future policy benefits 1,904.8 1,937.6    
Less: Reinsurance recoverable related to future policy benefits 374.5 73.4    
Net liability for future policy benefits, after reinsurance recoverable 1,530.3 1,864.2    
Gross premiums or assessments 174.5 170.8    
Interest accretion 23.4 24.0    
Expected future benefit payments 5,095.2 5,138.4    
Expected future gross premiums 5,812.4 5,812.6    
Expected future gross premiums $ 4,191.8 $ 4,181.3    
Interest accretion rate 5.20% 5.10%    
Current discount rate 5.20% 5.10%    
Weighted average duration of the liability 9 years 4 months 24 days 9 years 6 months    
Long-term Care | Closed Block        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present Value of Expected Net Premiums, Balance at beginning of year $ 7,732.7 $ 7,658.5    
Beginning balance at original discount rate 7,484.3 7,592.9    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (174.1) (69.9)
Adjusted beginning of year balance     7,310.2 7,523.0
Interest accretion 95.1 98.0    
Net premiums collected (161.7) (157.1)    
Ending balance at original discount rate 7,243.6 7,463.9    
Effect of change in discount rate assumptions 124.3 148.4    
Present Value of Expected Net Premiums, balance at end of period 7,367.9 7,612.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits, beginning of year 24,420.6 22,925.2    
Beginning balance at original discount rate 24,113.6 22,953.7    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (64.1) (63.0)
Adjusted beginning of year balance     24,049.5 22,890.7
Issuances 0.0 [5] 0.0 [6]    
Interest accretion 314.5 299.6    
Benefit payments (283.0) (254.3)    
Ending balance at original discount rate 24,081.0 22,936.0    
Effect of change in discount rate assumptions (192.3) 176.9    
Balance, end of period 23,888.7 23,112.9    
Net liability for future policy benefits 16,520.8 15,500.6    
Other 10.2 0.2    
Total liability for future policy benefits 16,531.0 15,500.8    
Less: Reinsurance recoverable related to future policy benefits 3,293.4 3.7    
Net liability for future policy benefits, after reinsurance recoverable 13,237.6 15,497.1    
Gross premiums or assessments 176.9 176.2    
Interest accretion 219.4 201.6    
Expected future benefit payments 58,230.7 59,439.9    
Expected future gross premiums 12,093.9 13,460.1    
Expected future gross premiums $ 7,419.3 $ 7,879.8    
Interest accretion rate 5.60% 5.60%    
Current discount rate 5.70% 5.50%    
Weighted average duration of the liability 14 years 4 months 24 days 15 years 6 months    
Liability for Future Policy Benefit, Adverse Development, Expense $ 49.1      
Other Insurance Product Line | Closed Block        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present Value of Expected Net Premiums, Balance at beginning of year 0.0 $ 0.0    
Beginning balance at original discount rate 0.0 0.0    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     0.0 0.0
Adjusted beginning of year balance     0.0 0.0
Interest accretion 0.0 0.0    
Net premiums collected 0.0 0.0    
Ending balance at original discount rate 0.0 0.0    
Effect of change in discount rate assumptions 0.0 0.0    
Present Value of Expected Net Premiums, balance at end of period 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits, beginning of year 6,785.8 7,138.4    
Beginning balance at original discount rate 7,056.2 7,591.0    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (4.9) (19.9)
Adjusted beginning of year balance     7,051.3 7,571.1
Issuances 22.9 [5] 26.9 [6]    
Interest accretion 77.7 83.5    
Benefit payments (214.2) (235.4)    
Ending balance at original discount rate 6,937.7 7,446.1    
Effect of change in discount rate assumptions (361.0) (369.7)    
Balance, end of period 6,576.7 7,076.4    
Net liability for future policy benefits 6,576.7 7,076.4    
Other 1,407.7 [7] 1,479.7 [8]    
Total liability for future policy benefits 7,984.4 8,556.1    
Less: Reinsurance recoverable related to future policy benefits 6,255.2 6,696.4    
Net liability for future policy benefits, after reinsurance recoverable 1,729.2 1,859.7    
Gross premiums or assessments 35.5 42.0    
Interest accretion 77.7 83.5    
Expected future benefit payments 10,050.5 10,864.4    
Expected future gross premiums 0.0 0.0    
Expected future gross premiums $ 0.0 $ 0.0    
Interest accretion rate 4.60% 4.60%    
Current discount rate 5.30% 5.20%    
Weighted average duration of the liability 7 years 1 month 6 days 7 years 2 months 12 days    
Operating Segments        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Present Value of Expected Net Premiums, Balance at beginning of year $ 14,416.5 $ 13,930.6    
Beginning balance at original discount rate 14,393.0 14,266.9    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (235.0) (183.2)
Adjusted beginning of year balance     14,158.0 14,083.7
Issuances 529.8 502.2    
Interest accretion 162.5 163.2    
Net premiums collected (455.3) (435.4)    
Foreign currency (12.7) 21.2    
Ending balance at original discount rate 14,382.3 14,334.9    
Effect of change in discount rate assumptions (189.0) (181.4)    
Present Value of Expected Net Premiums, balance at end of period 14,193.3 14,153.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Present value of expected future policy benefits, beginning of year 50,683.1 48,920.1    
Beginning balance at original discount rate 51,638.5 50,778.2    
Effect of changes in cash flow assumptions     0.0 0.0
Effect of actual variances from expected experience     (174.4) (289.0)
Adjusted beginning of year balance     $ 51,464.1 $ 50,489.2
Issuances [9] 1,300.7 1,272.5    
Interest accretion 582.5 572.7    
Benefit payments (1,641.1) (1,618.7)    
Foreign currency (63.9) 103.6    
Ending balance at original discount rate 51,642.3 50,819.3    
Effect of change in discount rate assumptions (1,865.4) (1,422.9)    
Balance, end of period 49,776.9 49,396.4    
Net liability for future policy benefits 35,583.6 35,242.9    
Other [10] 1,528.9 1,580.0    
Total liability for future policy benefits 37,112.5 36,822.9    
Less: Reinsurance recoverable related to future policy benefits 10,040.1 6,888.2    
Net liability for future policy benefits, after reinsurance recoverable 27,072.4 29,934.7    
Gross premiums or assessments 2,742.8 2,592.1    
Interest accretion $ 420.0 $ 409.5    
Current discount rate 5.40% 5.20% 5.10% 5.30%
Future Policy Benefits $ 37,300.5 $ 37,030.7    
[1]
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.
[2]
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.
[3]
1Unum US excludes the dental and vision product line and medical stop-loss products, Unum International excludes certain products in our supplemental product line and Closed Block excludes our participating fund account, which represents policies issued by one of our subsidiaries prior to its conversion from a mutual stock life insurance company. The liabilities associated with these products are included within Other products.
[4]
1Issuances for Unum International primarily represents new claim incurrals.
[5]
1Issuances for Closed Block - All Other represents new claim incurrals.
[6]
1Issuances for Closed Block - All Other represents new claim incurrals.
[7]
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.
[8]
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.
[9]
1Issuances include new policy issuances for most product lines. For our Unum US group disability, Unum US group life and AD&D and Closed Block - All Other product lines and certain of our Unum International product lines, this line represents new claim incurrals.
[10]
2Other primarily relates to our Closed Block - All Other product line.
v3.26.1
Policyholder Account Balance (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Policyholder Account Balance [Roll Forward]      
Policyholders' Account Balances $ 5,736.0   $ 5,636.4
Operating Segments      
Policyholder Account Balance [Roll Forward]      
Balance, beginning of year 5,467.0 $ 5,470.0  
Premiums received 34.7 40.2  
Policy Charges (59.2) [1] (59.9) [2]  
Surrenders and withdrawals (25.2) (23.2)  
Benefit payments (57.8) (69.2)  
Interest credited 96.9 95.6  
Other 2.2 2.5  
Balance, end of period 5,458.6 5,456.0  
Reserves in excess of account balance 170.9 164.8  
Total policyholders' account balances, after reserves in excess of account balance 5,629.5 5,620.8  
Policyholder Account Balance, Reinsurance recoverable 4,115.5 4,086.8  
Net policyholders' account balances, after reinsurance recoverable $ 1,514.0 $ 1,534.0  
Weighted average crediting rate 7.30% 7.20%  
Net Amount at Risk $ 12,790.1 [3] $ 13,800.0 [4]  
Cash surrender value 5,397.3 5,393.0  
Policyholders' Account Balances 5,736.0    
Unum US      
Policyholder Account Balance [Roll Forward]      
Policyholders' Account Balances 659.0    
Colonial Life      
Policyholder Account Balance [Roll Forward]      
Balance, beginning of year 845.2 849.0  
Premiums received 18.3 19.4  
Policy Charges (17.1) [1] (17.6) [2]  
Surrenders and withdrawals (10.0) (10.0)  
Benefit payments (2.2) (2.2)  
Interest credited 8.4 8.5  
Other (0.3) (0.1)  
Balance, end of period 842.3 847.0  
Reserves in excess of account balance 13.4 13.8  
Policyholder Account Balance, Reinsurance recoverable 0.0 0.1  
Net policyholders' account balances, after reinsurance recoverable $ 855.7 $ 860.7  
Weighted average crediting rate 4.10% 4.10%  
Net Amount at Risk $ 7,546.5 [3] $ 8,057.8 [4]  
Cash surrender value 824.1 821.1  
Policyholders' Account Balances 855.7 860.8  
Closed Block      
Policyholder Account Balance [Roll Forward]      
Policyholders' Account Balances 4,114.8    
Funding Agreements      
Policyholder Account Balance [Roll Forward]      
Policyholders' Account Balances 106.5    
Voluntary Benefits | Unum US      
Policyholder Account Balance [Roll Forward]      
Balance, beginning of year 548.4 568.8  
Premiums received 11.4 12.9  
Policy Charges (13.1) [1] (13.9) [2]  
Surrenders and withdrawals (11.6) (8.9)  
Benefit payments (1.4) (1.6)  
Interest credited 4.8 5.1  
Other 1.7 2.5  
Balance, end of period 540.2 564.9  
Reserves in excess of account balance 118.8 109.2  
Policyholder Account Balance, Reinsurance recoverable 0.7 0.8  
Net policyholders' account balances, after reinsurance recoverable $ 658.3 $ 673.3  
Weighted average crediting rate 3.60% 3.70%  
Net Amount at Risk $ 3,635.6 [3] $ 4,040.4 [4]  
Cash surrender value 530.7 554.9  
Policyholders' Account Balances 659.0 674.1  
Other Insurance Product Line | Closed Block      
Policyholder Account Balance [Roll Forward]      
Balance, beginning of year 4,073.4 4,052.2  
Premiums received 5.0 7.9  
Policy Charges (29.0) [1] (28.4) [2]  
Surrenders and withdrawals (3.6) (4.3)  
Benefit payments (54.2) (65.4)  
Interest credited 83.7 82.0  
Other 0.8 0.1  
Balance, end of period 4,076.1 4,044.1  
Reserves in excess of account balance 38.7 41.8  
Policyholder Account Balance, Reinsurance recoverable 4,114.8 4,085.9  
Net policyholders' account balances, after reinsurance recoverable $ 0.0 $ 0.0  
Weighted average crediting rate 8.60% 8.40%  
Net Amount at Risk $ 1,608.0 [3] $ 1,701.8 [4]  
Cash surrender value 4,042.5 4,017.0  
Policyholders' Account Balances $ 4,114.8 $ 4,085.9  
[1]
1Contracts included in the policyholders' account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
[2]
1Contracts included in the policyholders' account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
[3]
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.
[4]
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.
v3.26.1
Policyholder Account Balance, Guaranteed Minimum Crediting (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Operating Segments        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period $ 5,458.6 $ 5,467.0 $ 5,456.0 $ 5,470.0
Colonial Life        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 842.3 845.2 847.0 849.0
Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 540.2 548.4 564.9 568.8
Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 4,076.1 $ 4,073.4 4,044.1 $ 4,052.2
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 83.3   $ 87.9  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 | Minimum | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     3.00%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 | Maximum | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     3.99%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499 | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 429.2   $ 446.6  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499 | Minimum | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     4.00%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499 | Maximum | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     4.99%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600 [Member] | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 27.7   $ 30.4  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600 [Member] | Minimum | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     5.00%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600 [Member] | Maximum | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     6.00%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period      
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500 | Colonial Life        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 842.3   $ 847.0  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500 | Minimum | Colonial Life        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     4.00%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500 | Maximum | Colonial Life        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     5.00%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 1,437.1   $ 1,504.0  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599 | Minimum | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     3.00%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599 | Maximum | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     5.99%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 24.7   $ 26.3  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899 | Minimum | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     6.00%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899 | Maximum | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     8.99%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 2,390.1   $ 2,306.7  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199 | Minimum | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     9.00%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199 | Maximum | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     11.99%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 224.2   $ 207.1  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500 | Minimum | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     12.00%  
Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500 | Maximum | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, Guaranteed Minimum Credit Rating     15.00%  
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Operating Segments        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 5,215.6   $ 5,191.6  
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 339.0   361.9  
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 4,040.7   3,989.0  
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 83.3   87.9  
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499 | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 228.0   243.6  
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600 [Member] | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 27.7   30.4  
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500 | Colonial Life        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 835.9   840.7  
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 1,401.7   1,448.9  
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 24.7   26.3  
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 2,390.1   2,306.7  
Policyholder Account Balance, at Guaranteed Minimum Crediting Rate | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 224.2   207.1  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Operating Segments        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 236.5   257.5  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 201.2   203.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 28.9   48.2  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499 | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 201.2   203.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600 [Member] | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500 | Colonial Life        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 6.4   6.3  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 28.9   48.2  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Operating Segments        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 6.5   6.9  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 6.5   6.9  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499 | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600 [Member] | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500 | Colonial Life        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 6.5   6.9  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Operating Segments        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0499 | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0500 and 0600 [Member] | Voluntary Benefits | Unum US        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and 0500 | Colonial Life        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 and 0599 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0600 and 0899 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0900 and 1199 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period 0.0   0.0  
Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater | Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 1200 and 1500 | Other Insurance Product Line | Closed Block        
Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items]        
Policyholder Account Balance, before Reserves in excess of Account Balance, end of period $ 0.0   $ 0.0  
v3.26.1
Deferred Policy Acquisition Costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Movement Analysis of Deferred Policy Acquisition Costs    
Deferred Acquisition Costs at Beginning of Period $ 2,920.3  
Amortization expense (134.2) $ (125.4)
Deferred Acquisition Costs at End of Period 2,974.4  
Operating Segments    
Movement Analysis of Deferred Policy Acquisition Costs    
Deferred Acquisition Costs at Beginning of Period 2,920.3 2,842.8
Capitalization 190.6 172.6
Amortization expense (134.2) (125.4)
Foreign currency (2.3) 3.2
Deferred Acquisition Costs at End of Period 2,974.4 2,893.2
Unum US    
Movement Analysis of Deferred Policy Acquisition Costs    
Deferred Acquisition Costs at Beginning of Period 1,208.7 1,260.6
Capitalization 91.6 84.7
Amortization expense (68.7) (65.2)
Foreign currency 0.0 0.0
Deferred Acquisition Costs at End of Period 1,231.6 1,280.1
Unum US | Operating Segments    
Movement Analysis of Deferred Policy Acquisition Costs    
Amortization expense (68.7) (65.2)
Unum International    
Movement Analysis of Deferred Policy Acquisition Costs    
Deferred Acquisition Costs at Beginning of Period 72.1 53.0
Capitalization 9.2 5.3
Amortization expense (3.4) (2.5)
Foreign currency (2.3) 3.2
Deferred Acquisition Costs at End of Period 75.6 59.0
Unum International | Operating Segments    
Movement Analysis of Deferred Policy Acquisition Costs    
Amortization expense (3.4) (2.5)
Colonial Life    
Movement Analysis of Deferred Policy Acquisition Costs    
Deferred Acquisition Costs at Beginning of Period 1,639.5 1,529.2
Capitalization 89.8 82.6
Amortization expense (62.1) (57.7)
Foreign currency 0.0 0.0
Deferred Acquisition Costs at End of Period 1,667.2 1,554.1
Colonial Life | Operating Segments    
Movement Analysis of Deferred Policy Acquisition Costs    
Amortization expense (62.1) (57.7)
Group Disability | Unum US    
Movement Analysis of Deferred Policy Acquisition Costs    
Deferred Acquisition Costs at Beginning of Period 63.6 61.1
Capitalization 16.3 16.1
Amortization expense (13.9) (10.4)
Deferred Acquisition Costs at End of Period 66.0 66.8
Group Life and AD&D | Unum US    
Movement Analysis of Deferred Policy Acquisition Costs    
Deferred Acquisition Costs at Beginning of Period 57.6 51.1
Capitalization 12.3 11.6
Amortization expense (8.7) (6.1)
Deferred Acquisition Costs at End of Period 61.2 56.6
Voluntary Benefits | Unum US    
Movement Analysis of Deferred Policy Acquisition Costs    
Deferred Acquisition Costs at Beginning of Period 622.8 614.3
Capitalization 34.0 32.2
Amortization expense (28.8) (29.8)
Deferred Acquisition Costs at End of Period 628.0 616.7
Individual Disability | Unum US    
Movement Analysis of Deferred Policy Acquisition Costs    
Deferred Acquisition Costs at Beginning of Period 451.6 521.2
Capitalization 25.4 21.0
Amortization expense (13.6) (15.4)
Deferred Acquisition Costs at End of Period 463.4 526.8
Dental and Vision | Unum US    
Movement Analysis of Deferred Policy Acquisition Costs    
Deferred Acquisition Costs at Beginning of Period 13.1 12.9
Capitalization 3.6 3.8
Amortization expense (3.7) (3.5)
Deferred Acquisition Costs at End of Period $ 13.0 $ 13.2
v3.26.1
Premium Income by Major Line of Business within Each Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting    
Premium Income $ 2,794.0 $ 2,702.9
Operating Segments    
Segment Reporting    
Premium Income 2,794.0 2,702.9
Operating Segments | Unum US    
Segment Reporting    
Premium Income 1,840.5 1,780.9
Operating Segments | Unum US | Group Long-term Disability    
Segment Reporting    
Premium Income 498.8 504.5
Operating Segments | Unum US | Group Short-term Disability    
Segment Reporting    
Premium Income 310.7 278.3
Operating Segments | Unum US | Group Life    
Segment Reporting    
Premium Income 495.4 466.2
Operating Segments | Unum US | Accidental Death & Dismemberment    
Segment Reporting    
Premium Income 53.0 48.2
Operating Segments | Unum US | Voluntary Benefits    
Segment Reporting    
Premium Income 253.8 234.1
Operating Segments | Unum US | Individual Disability    
Segment Reporting    
Premium Income 146.5 168.7
Operating Segments | Unum US | Dental and Vision    
Segment Reporting    
Premium Income 82.3 80.9
Operating Segments | Unum International    
Segment Reporting    
Premium Income 286.7 246.7
Operating Segments | Unum International | Group Long-term Disability    
Segment Reporting    
Premium Income 104.8 100.2
Operating Segments | Unum International | Group Life    
Segment Reporting    
Premium Income 77.0 61.6
Operating Segments | Unum International | Supplemental    
Segment Reporting    
Premium Income 50.3 41.9
Operating Segments | Unum International | Unum Poland    
Segment Reporting    
Premium Income 54.6 43.0
Operating Segments | Colonial Life    
Segment Reporting    
Premium Income 472.7 457.3
Operating Segments | Colonial Life | Accident, Sickness, and Disability    
Segment Reporting    
Premium Income 252.8 247.1
Operating Segments | Colonial Life | Life    
Segment Reporting    
Premium Income 128.3 119.9
Operating Segments | Colonial Life | Cancer and Critical Illness Colonial    
Segment Reporting    
Premium Income 91.6 90.3
Operating Segments | Closed Block    
Segment Reporting    
Premium Income 194.1 218.0
Operating Segments | Closed Block | Long-term Care    
Segment Reporting    
Premium Income 159.4 176.2
Operating Segments | Closed Block | Other Insurance Product Line    
Segment Reporting    
Premium Income $ 34.7 $ 41.8
v3.26.1
Selected Operating Statement Data by Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting    
Premium Income $ 2,794.0 $ 2,702.9
Net Investment Income 483.4 513.2
Other Income 82.8 82.3
Benefits and Change in Reserves for Future Benefits 1,955.8 1,960.3
Policy Benefits - Remeasurement Loss (Gain) 48.2 (89.3)
Commissions 368.5 343.2
Interest and Debt Expense 53.1 52.0
Deferral of Acquisition Costs (190.6) (172.6)
Amortization of Deferred Acquisition Costs 134.2 125.4
Benefits, Losses and Expenses 3,052.5 2,848.0
Unum US    
Segment Reporting    
Amortization of Deferred Acquisition Costs 68.7 65.2
Unum International    
Segment Reporting    
Amortization of Deferred Acquisition Costs 3.4 2.5
Colonial Life    
Segment Reporting    
Amortization of Deferred Acquisition Costs 62.1 57.7
Operating Segments    
Segment Reporting    
Premium Income 2,794.0 2,702.9
Net Investment Income 483.4 513.2
Other Income 82.8 82.3
Segment Adjusted Operating Revenue 3,360.2 3,298.4
Benefits and Change in Reserves for Future Benefits 1,955.8 1,960.3
Policy Benefits - Remeasurement Loss (Gain) 48.2 (89.3)
Commissions 368.5 343.2
Interest and Debt Expense 53.1 52.0
Deferral of Acquisition Costs (190.6) (172.6)
Amortization of Deferred Acquisition Costs 134.2 125.4
Benefits, Losses and Expenses 3,052.5 2,848.0
Segment Adjusted Operating Income (Loss) 307.7 450.4
Other Segment Items 683.3 [1] 629.0 [2]
Operating Segments | Unum US    
Segment Reporting    
Premium Income 1,840.5 1,780.9
Net Investment Income 158.3 148.9
Other Income 66.8 71.9
Segment Adjusted Operating Revenue 2,065.6 2,001.7
Benefits and Change in Reserves for Future Benefits 1,127.1 1,138.6
Policy Benefits - Remeasurement Loss (Gain) (31.8) (75.4)
Commissions 219.4 205.6
Interest and Debt Expense 0.0  
Deferral of Acquisition Costs (91.6) (84.7)
Amortization of Deferred Acquisition Costs 68.7 65.2
Benefits, Losses and Expenses 1,727.7 1,672.6
Segment Adjusted Operating Income (Loss) 337.9 329.1
Other Segment Items 435.9 [1] 423.3 [2]
Depreciation and Amortization 21.7 21.3
Operating Segments | Unum International    
Segment Reporting    
Premium Income 286.7 246.7
Net Investment Income 29.6 28.5
Other Income 3.3 0.1
Segment Adjusted Operating Revenue 319.6 275.3
Benefits and Change in Reserves for Future Benefits 206.3 172.9
Policy Benefits - Remeasurement Loss (Gain) (2.8) (8.8)
Commissions 31.0 22.4
Interest and Debt Expense 0.0 0.0
Deferral of Acquisition Costs (9.2) (5.3)
Amortization of Deferred Acquisition Costs 3.4 2.5
Benefits, Losses and Expenses 288.7 236.6
Segment Adjusted Operating Income (Loss) 30.9 38.7
Other Segment Items 60.0 [1] 52.9 [2]
Depreciation and Amortization 5.5 4.7
Operating Segments | Colonial Life    
Segment Reporting    
Premium Income 472.7 457.3
Net Investment Income 46.8 42.2
Other Income 0.7 0.4
Segment Adjusted Operating Revenue 520.2 499.9
Benefits and Change in Reserves for Future Benefits 229.7 226.6
Policy Benefits - Remeasurement Loss (Gain) (12.4) (8.5)
Commissions 102.9 97.3
Interest and Debt Expense 0.0 0.0
Deferral of Acquisition Costs (89.8) (82.6)
Amortization of Deferred Acquisition Costs 62.1 57.7
Benefits, Losses and Expenses 392.4 384.2
Segment Adjusted Operating Income (Loss) 127.8 115.7
Other Segment Items 99.9 [1] 93.7 [2]
Depreciation and Amortization 4.4 4.2
Operating Segments | Closed Block    
Segment Reporting    
Premium Income 194.1 218.0
Net Investment Income 229.1 269.7
Other Income 11.3 9.9
Segment Adjusted Operating Revenue 434.5 497.6
Benefits and Change in Reserves for Future Benefits 392.7 422.2
Policy Benefits - Remeasurement Loss (Gain) 95.2 3.4
Commissions 15.2 17.9
Interest and Debt Expense 0.0 0.0
Deferral of Acquisition Costs 0.0 0.0
Amortization of Deferred Acquisition Costs 0.0 0.0
Benefits, Losses and Expenses 579.8 489.6
Segment Adjusted Operating Income (Loss) (145.3) 8.0
Other Segment Items 76.7 [1] 46.1 [2]
Depreciation and Amortization 1.6 1.5
Operating Segments | Corporate    
Segment Reporting    
Premium Income 0.0 0.0
Net Investment Income 19.6 23.9
Other Income 0.7 0.0
Segment Adjusted Operating Revenue 20.3 23.9
Benefits and Change in Reserves for Future Benefits 0.0 0.0
Policy Benefits - Remeasurement Loss (Gain) 0.0 0.0
Commissions 0.0 0.0
Interest and Debt Expense 53.1 52.0
Deferral of Acquisition Costs 0.0 0.0
Amortization of Deferred Acquisition Costs 0.0 0.0
Benefits, Losses and Expenses 63.9 65.0
Segment Adjusted Operating Income (Loss) (43.6) (41.1)
Other Segment Items 10.8 [1] 13.0 [2]
Depreciation and Amortization $ 0.2 $ 0.1
[1]
1For each reportable segment, other segment items includes compensation, other personnel expenses, taxes, licenses and fees, depreciation, intangible asset amortization and other expenses. Depreciation and intangible asset amortization during the three months ended March 31, 2026 was $21.7 million, $5.5 million, $4.4 million, $1.6 million, and $0.2 million for our Unum US, Unum International, Colonial Life, Closed Block and Corporate segments, respectively.
[2]
1For each reportable segment, other segment items includes compensation, other personnel expenses, taxes, licenses and fees, depreciation, intangible asset amortization and other expenses. Depreciation and intangible asset amortization during the three months ended March 31, 2025 was $21.3 million, $4.7 million, $4.2 million, $1.5 million, and $0.1 million for our Unum US, Unum International, Colonial Life, Closed Block and Corporate segments, respectively.
v3.26.1
Assets by Segment (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Segment Reporting    
Total Assets $ 62,714.3 $ 63,519.4
Operating Segments | Unum US    
Segment Reporting    
Total Assets 14,500.9 14,635.3
Operating Segments | Unum International    
Segment Reporting    
Total Assets 3,661.9 3,648.0
Operating Segments | Colonial Life    
Segment Reporting    
Total Assets 5,332.4 5,289.9
Operating Segments | Closed Block    
Segment Reporting    
Total Assets 32,503.2 33,887.8
Operating Segments | Corporate    
Segment Reporting    
Total Assets $ 6,715.9 $ 6,058.4
v3.26.1
Reconciliation of Total Revenue and Income Before Income Tax to Operating Revenue and Segment Adjusted Operating Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Segment Reporting      
Total Revenue $ 3,355.2 $ 3,091.6  
Net Investment Loss (5.0) (206.8)  
Operating Segments      
Segment Reporting      
Total Revenue 3,355.2 3,091.6  
Net Investment Loss (5.0) (206.8)  
Segment Adjusted Operating Revenue 3,360.2 3,298.4  
Income Before Income Tax 302.7 243.6  
Segment Adjusted Operating Income 307.7 450.4  
Operating Segments | Long-term Care and Individual Disability Reinsurance Transaction      
Segment Reporting      
Net Investment Loss 0.0 (175.9) $ (46.8)
Operating Segments | Unrelated to Significant Transaction      
Segment Reporting      
Net Investment Loss $ (5.0) $ (30.9)  
v3.26.1
Segment Information Segments - Additional Information (Detail)
$ in Millions
 3 Months Ended
Mar. 31, 2026
USD ($)
Integer
Dec. 31, 2025
USD ($)
Segment Reporting    
Goodwill $ 353.0 $ 353.9
Number of Operating Segments | Integer 3  
Unum US    
Segment Reporting    
Goodwill $ 281.2 281.2
Colonial Life    
Segment Reporting    
Goodwill 27.7 27.7
Unum International    
Segment Reporting    
Goodwill $ 44.1 $ 45.0
v3.26.1
Employee Benefit Plans Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Pension Plan | UNITED STATES    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Service Cost $ 1.8 $ 2.4
Interest Cost 16.4 21.4
Expected Return on Plan Assets (16.7) (21.8)
Amortization of Net Actuarial (Gain) Loss 2.2 3.7
Amortization of Prior Service Credit 0.0 0.0
Net Periodic Benefit Cost (Credit) 3.7 5.7
Pension Plan | Foreign Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Service Cost 0.0 0.0
Interest Cost 2.2 2.1
Expected Return on Plan Assets (2.5) (2.2)
Amortization of Net Actuarial (Gain) Loss 0.7 0.7
Amortization of Prior Service Credit 0.0 0.0
Net Periodic Benefit Cost (Credit) 0.4 0.6
Other Postretirement Benefit Plans    
Defined Benefit Plans and Other Postretirement Benefit Plans    
Service Cost 0.0 0.0
Interest Cost 0.9 1.0
Expected Return on Plan Assets (0.1) (0.1)
Amortization of Net Actuarial (Gain) Loss (0.2) (0.3)
Amortization of Prior Service Credit (0.1) (0.1)
Net Periodic Benefit Cost (Credit) $ 0.5 $ 0.5
v3.26.1
Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Numerator    
Net Income $ 232.0 $ 189.1
Denominator    
Weighted Average Common Shares - Basic 164,073,900 178,291,500
Dilution for Assumed Exercises of Nonvested Stock Awards 325,600 590,900
Weighted Average Common Shares - Assuming Dilution 164,399,500 178,882,400
Net Income Per Common Share    
Basic $ 1.41 $ 1.06
Assuming Dilution $ 1.41 $ 1.06
v3.26.1
Treasury Stock Transactions (Details) - USD ($)
shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended
Feb. 28, 2025
Nov. 30, 2024
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2025
Dec. 31, 2025
Nov. 01, 2024
Equity, Class of Treasury Stock              
Cost of Shares Repurchased [1]     $ 402.4 $ 202.6      
Number of Treasury Shares Repurchased     5.4 3.3 [2]      
Shares repurchased cost Commissions     $ 0.1 $ 0.5      
Share Repurchase Program, Excise Tax     3.7 $ 2.1      
November 2024 Accelerated Share Repurchase              
Equity, Class of Treasury Stock              
Number of Treasury Shares Repurchased 0.7 3.8          
Accelerated Share Repurchases, Settlement (Payment) or Receipt             $ 321.0
Repurchase Program Authorized in December 2025              
Equity, Class of Treasury Stock              
Authorized Amount of Treasury Share Repurchases Under Stock Repurchase Program     1,000.0        
Cost of Shares Repurchased     398.6        
Remaining Amount of Treasury Share Repurchases Authorized Under Stock Repurchase Program     $ 601.4        
Repurchase Program Authorized in February 2025              
Equity, Class of Treasury Stock              
Expiration Date of Share Repurchase Program [3]     Dec. 31, 2025        
Authorized Amount of Treasury Share Repurchases Under Stock Repurchase Program [3]     $ 1,000.0        
Cost of Shares Repurchased [3]           $ 800.0  
Remaining Amount of Treasury Share Repurchases Authorized Under Stock Repurchase Program [3]     $ 0.0        
Repurchase Program Authorized in July 2024              
Equity, Class of Treasury Stock              
Expiration Date of Share Repurchase Program [4]     Mar. 31, 2025        
Authorized Amount of Treasury Share Repurchases Under Stock Repurchase Program [4]     $ 1,000.0        
Cost of Shares Repurchased [4]         $ 706.8    
Remaining Amount of Treasury Share Repurchases Authorized Under Stock Repurchase Program [4]     $ 0.0        
[1]
2Includes $0.1 million and $0.5 million of commissions for the three months ended March 31, 2026 and 2025, respectively. Also includes $3.7 million and $2.1 million of excise taxes for the three months ended March 31, 2026 and 2025, respectively.
[2] 1For the three months ended March 31, 2025, includes 0.7 million shares related to the settlement of the November 2024 accelerated share repurchase agreement (ASR) which occurred in February 2025.
[3]
1Concurrent with the announcement of the December 2025 repurchase program, we also announced the termination of the February 2025 program as of December 31, 2025, and any unused amounts under that program expired as of that date.
[4]
2Concurrent with the announcement of the February 2025 repurchase program, we also announced the termination of the July 2024 program as of March 31, 2025, and any unused amounts under that program expired as of that date.
v3.26.1
Stockholders' Equity and Earnings Per Common Share - Additional Information (Detail) - $ / shares
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Stockholders Equity and Earnings Per Common Share Additional Information [Abstract]    
Outstanding Restricted Stock Unit Grant Prices Lower Limit $ 40.29  
Outstanding Restricted Stock Unit Grant Prices Upper Limit $ 83.04  
Antidilutive Securities Excluded from Computation of Earnings Per Share 300,000 300,000
Authorized Shares of Preferred Stock 25,000,000.0  
Par Value Per Share of Preferred Stock $ 0.10  
Issued Shares of Preferred Stock 0  
v3.26.1
Debt - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Apr. 21, 2026
Line of Credit Facility    
Extinguishment of Debt, Amount $ 7.7  
Debt Instrument, Interest Rate, Stated Percentage 6.25%  
Subsequent Event    
Line of Credit Facility    
Line of Credit Facility, Maximum Borrowing Capacity   $ 50.0
v3.26.1
Allowance for Expected Credit Losses on Premiums Receivable (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Credit Loss [Abstract]        
Premium Receivable, Allowance for Credit Loss $ 26.9 $ 26.1 $ 27.0 $ 26.8
Premiums Receivable, Gross 727.4 $ 579.5 $ 631.8 $ 584.1
Premium Receivable, Credit Loss Expense (Reversal) $ 0.8      
v3.26.1
Reinsurance - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Sep. 30, 2025
Dec. 31, 2025
Jul. 01, 2025
Effects of Reinsurance          
Debt Securities, Available-for-Sale $ 33,300.8     $ 33,056.6  
Accrued Investment Income 582.0     596.0  
Net Investment Loss (5.0) $ (206.8)      
Reinsurance Recoverable 11,310.9     11,574.6  
Operating Segments          
Effects of Reinsurance          
Net Investment Loss (5.0) (206.8)      
Long-term Care and Individual Disability Reinsurance Transaction          
Effects of Reinsurance          
Cash Related to Reinsurance Agreement     $ 953.5    
Debt Securities, Available-for-Sale         $ 3,230.1
Accrued Investment Income         $ 47.1
Negative Ceding Commission       442.3  
Reinsurance Recoverable       3,620.5  
Long-term Care and Individual Disability Reinsurance Transaction | Operating Segments          
Effects of Reinsurance          
Net Investment Loss $ 0.0 $ (175.9)   (46.8)  
Long-term Care and Individual Disability Reinsurance Transaction | Long-term Care | Closed Block          
Effects of Reinsurance          
Reinsurance Recoverable       3,315.2  
Deferred Loss On Reinsurance       848.2  
Long-term Care and Individual Disability Reinsurance Transaction | Individual Disability | Unum US          
Effects of Reinsurance          
Reinsurance Recoverable       305.3  
Deferred Gain On Reinsurance       145.9  
Change in Deferred Acquisition Costs       $ (100.3)