Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Apr. 19, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	Franklin Resources Inc
Entity Central Index Key	0000038777
Current Fiscal Year End Date	--09-30
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		540,208,274

Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Consolidated Statements of Income - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Operating Revenues
Investment management fees	$ 1,117.1	$ 1,089.2	$ 2,230.7	$ 2,152.4
Sales and distribution fees	409.8	431.2	827.6	850.5
Shareholder servicing fees	61.3	56.4	116.2	113.0
Other	29.6	23.8	58.8	45.5
Total operating revenues	1,617.8	1,600.6	3,233.3	3,161.4
Operating Expenses
Sales, distribution and marketing	521.5	534.8	1,050.2	1,054.8
Compensation and benefits	355.5	343.4	688.0	654.9
Information systems and technology	58.1	54.0	113.1	105.7
Occupancy	34.1	29.0	63.5	58.1
General, administrative and other	92.9	83.9	181.7	145.5
Total operating expenses	1,062.1	1,045.1	2,096.5	2,019.0
Operating Income	555.7	555.5	1,136.8	1,142.4
Other Income (Expenses)
Investment and other income, net	87.4	84.6	168.7	130.7
Interest expense	(10.0)	(12.6)	(20.8)	(25.9)
Other income, net	77.4	72.0	147.9	104.8
Income before taxes	633.1	627.5	1,284.7	1,247.2
Taxes on income	150.2	192.5	1,373.7	393.4
Net income (loss)	482.9	435.0	(89.0)	853.8
Less: net income (loss) attributable to
Nonredeemable noncontrolling interests	24.5	(6.0)	24.4	(3.9)
Redeemable noncontrolling interests	15.2	20.3	26.7	(3.2)
Net Income (Loss) Attributable to Franklin Resources, Inc.	$ 443.2	$ 420.7	$ (140.1)	$ 860.9
Earnings (Loss) per Share
Basic	$ 0.79	$ 0.74	$ (0.29)	$ 1.52
Diluted	0.78	0.74	(0.29)	1.52
Dividends Declared per Share	$ 3.23	$ 0.2	$ 3.46	$ 0.4

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 482.9	$ 435.0	$ (89.0)	$ 853.8
Other Comprehensive Income (Loss)
Net unrealized gains (losses) on investments, net of tax	(0.2)	5.4	3.3	3.0
Currency translation adjustments, net of tax	6.8	39.2	22.6	(21.7)
Net unrealized gains (losses) on defined benefit plans, net of tax	0.4	0.0	(0.7)	0.0
Total other comprehensive income (loss)	7.0	44.6	25.2	(18.7)
Total comprehensive income (loss)	489.9	479.6	(63.8)	835.1
Less: comprehensive income (loss) attributable to
Nonredeemable noncontrolling interests	24.5	(6.0)	24.4	(3.9)
Redeemable noncontrolling interests	15.2	20.3	26.7	(3.2)
Comprehensive Income (Loss) Attributable to Franklin Resources, Inc.	$ 450.2	$ 465.3	$ (114.9)	$ 842.2

Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Assets
Cash and cash equivalents	$ 8,726.5	$ 8,749.7
Receivables	765.4	767.8
Investments	1,579.0	1,393.6
Investments, at fair value	449.5	440.0
Property and equipment, net	517.7	517.2
Goodwill and other intangible assets, net	2,242.3	2,227.7
Other	196.2	176.5
Total Assets	17,690.0	17,534.0
Liabilities
Compensation and benefits	291.7	396.6
Accounts payable and accrued expenses	194.6	167.4
Dividends	1,763.7	113.3
Commissions	310.7	313.3
Income taxes	1,178.3	74.7
Debt	1,044.8	1,044.2
Deferred taxes	129.9	170.6
Other	187.8	198.7
Total liabilities	5,203.4	2,656.3
Commitments and Contingencies (Note 10)
Redeemable Noncontrolling Interests	2,084.4	1,941.9
Stockholders' Equity
Preferred stock, $1.00 par value, 1,000,000 shares authorized; none issued	0.0	0.0
Common stock, $0.10 par value, 1,000,000,000 shares authorized; 541,695,819 and 554,865,343 shares issued and outstanding at March 31, 2018 and September 30, 2017	54.2	55.5
Retained earnings	10,263.9	12,849.3
Accumulated other comprehensive loss	(259.7)	(284.8)
Total Franklin Resources, Inc. stockholders’ equity	10,058.4	12,620.0
Nonredeemable noncontrolling interests	343.8	315.8
Total stockholders’ equity	10,402.2	12,935.8
Total Liabilities, Redeemable Noncontrolling Interests and Stockholders’ Equity	17,690.0	17,534.0
Consolidated Investment Products [Member]
Assets
Cash and cash equivalents	181.1	226.4
Receivables	133.6	234.1
Investments, at fair value	3,529.3	3,467.4
Other	1.0	0.9
Total Assets	3,845.0	3,928.8
Liabilities
Accounts payable and accrued expenses	67.9	124.1
Debt	34.0	53.4
Other	11.9	8.7
Total liabilities	113.8	186.2
Redeemable Noncontrolling Interests	2,084.4	1,941.9
Stockholders' Equity
Total Franklin Resources, Inc. stockholders’ equity	1,330.0	1,511.8
Nonredeemable noncontrolling interests	316.8	288.9
Total stockholders’ equity	1,646.8	1,800.7
Total Liabilities, Redeemable Noncontrolling Interests and Stockholders’ Equity	3,845.0	3,928.8
Franklin Resources, Inc. [Member]
Assets
Cash and cash equivalents	$ 8,545.4	$ 8,523.3

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Statement of Financial Position [Abstract]
Investments, at fair value	$ 449.5	$ 440.0
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.1	$ 0.1
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	541,695,819	554,865,343
Common stock, shares outstanding	541,695,819	554,865,343

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References + Details

Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net cash provided by operating activities
Net Income (Loss)	$ (89.0)	$ 853.8
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization of deferred sales commissions	40.5	34.4
Depreciation and other amortization	38.3	40.5
Stock-based compensation	61.2	63.3
Income from investments in equity method investees	(45.9)	(70.5)
Net (gains) losses on investments of consolidated investment products	(36.3)	6.8
Deferred income taxes	(44.7)	0.6
Other	7.1	(8.1)
Changes in operating assets and liabilities:
Increase in receivables and other assets	(59.3)	(16.7)
Increase (decrease) in receivables of consolidated investment products	100.3	(58.4)
Increase (decrease) in trading securities, net	(34.6)	65.8
Increase in trading securities of consolidated investment products, net	(46.5)	(285.6)
Decrease in accrued compensation and benefits	(107.0)	(79.1)
Decrease in commissions payable	(2.6)	(8.3)
Increase in income taxes payable	1,103.6	53.9
Increase (decrease) in accounts payable, accrued expenses and other liabilities	11.3	(26.5)
Increase in accounts payable and accrued expenses of consolidated investment products	0.6	48.4
Net cash provided by operating activities	897.0	614.3
Net cash provided by (used in) investing activities
Purchase of investments	(182.6)	(292.1)
Liquidation of investments	74.5	239.5
Purchase of investments by consolidated investment products	(40.3)	(88.1)
Liquidation of investments by consolidated investment products	68.6	283.7
Additions of property and equipment, net	(43.7)	(28.8)
Adoption of new accounting guidance	0.0	(49.2)
Acquisition of businesses	(9.7)	(14.0)
Net (deconsolidation) consolidation of investment products	(48.3)	23.1
Net cash provided by (used in) investing activities	(181.5)	74.1
Net cash used in financing activities
Issuance of common stock	13.6	13.0
Dividends paid on common stock	(239.0)	(216.7)
Repurchase of common stock	(619.4)	(425.1)
Excess tax benefit from stock-based compensation	0.0	0.3
Payment on loan	0.0	(22.5)
Proceeds from debt of consolidated investment products	0.0	0.7
Payments on debt by consolidated investment products	(19.6)	(44.7)
Payments on contingent consideration liability	(21.6)	(31.7)
Noncontrolling interests	121.5	364.9
Net cash used in financing activities	(764.5)	(361.8)
Effect of exchange rate changes on cash and cash equivalents	25.8	(33.8)
Increase (decrease) in cash and cash equivalents	(23.2)	292.8
Cash and cash equivalents, beginning of period	8,749.7	8,483.3
Cash and Cash Equivalents, End of Period	8,726.5	8,776.1
Supplemental Disclosure of Cash Flow Information
Cash paid for income taxes	310.9	332.0
Cash paid for interest	24.1	23.4
Cash paid for interest by consolidated investment products	$ 1.5	$ 7.4

Basis of Presentation	6 Months Ended
Basis of Presentation	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The unaudited interim financial statements of Franklin Resources, Inc. and its consolidated subsidiaries (collectively, the “Company”) included herein have been prepared by the Company in accordance with the instructions to Form 10-Q and the rules and regulations of the U.S. Securities and Exchange Commission. Under these rules and regulations, some information and footnote disclosures normally included in financial statements prepared under accounting principles generally accepted in the United States of America have been shortened or omitted. Management believes that all adjustments necessary for a fair statement of the financial position and the results of operations for the periods shown have been made. All adjustments are normal and recurring. These financial statements should be read together with the Company’s audited financial statements included in its Form 10-K for the fiscal year ended September 30, 2017 (“fiscal year 2017”). Certain comparative amounts for the prior fiscal year period have been reclassified to conform to the financial statement presentation as of and for the period ended March 31, 2018.

New Accounting Guidance	6 Months Ended
New Accounting Guidance	Mar. 31, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Guidance	New Accounting Guidance Recently Adopted Accounting Guidance On October 1, 2017, the Company adopted an amendment to the existing stock-based compensation guidance issued by the Financial Accounting Standards Board (“FASB”). The amendment requires all income tax effects of stock-based awards to be recognized as income tax expense when the awards vest or settle and clarifies the classification of these transactions within the statement of cash flows. The amendment also provides an election to account for forfeitures as they occur, which the Company made using the modified retrospective approach which did not require the restatement of prior-year periods and did not result in a material impact on retained earnings. The income tax effect and statement of cash flow changes were adopted on a prospective basis. The adoption of the amendment will increase the volatility of income tax expense as a result of fluctuations in the Company’s stock price. Accounting Guidance Not Yet Adopted The FASB issued new guidance in May 2014 that requires use of a single principles-based model for recognition of revenue from contracts with customers. The core principle of the model is that revenue is recognized upon the transfer of promised goods or services to customers in an amount that reflects the expected consideration to be received for the goods or services. The guidance also changes the accounting for certain contract costs and revises the criteria for determining if an entity is acting as a principal or agent in certain arrangements. The guidance is effective for the Company on October 1, 2018 and allows for either a full retrospective or modified approach at adoption. While the Company’s implementation efforts are ongoing, it does not expect adoption of the guidance to have a significant impact on the timing of recognition for substantially all of its operating revenue or the accounting for its contract costs. The Company continues to assess certain arrangements to determine whether it continues to act as a principal and present the related revenue gross of associated expenses. The overall impact upon adoption may differ based on further evaluation of the Company’s arrangements and other facts and circumstances identified during implementation. The Company has not yet determined its transition approach. There were no other significant updates to the new accounting guidance not yet adopted by the Company as disclosed in its Form 10-K for fiscal year 2017.

Stockholders' Equity

6 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

Stockholders’ Equity

Changes in total stockholders’ equity were as follows:



(in millions)	Franklin Resources, Inc. Stockholders’ Equity			Nonredeemable Noncontrolling Interests			Total Stockholders’ Equity
for the six months ended March 31, 2018	Franklin Resources, Inc. Stockholders’ Equity			Nonredeemable Noncontrolling Interests			Total Stockholders’ Equity
Balance at October 1, 2017	$	12,620.0		$	315.8		$	12,935.8
Adoption of new accounting guidance	0.4			—			0.4
Net income (loss)	(140.1		)	24.4			(115.7		)
Other comprehensive income	25.2						25.2
Cash dividends declared on common stock	(1,889.4		)				(1,889.4		)
Repurchase of common stock	(632.6		)				(632.6		)
Stock-based compensation	74.9						74.9
Net subscriptions and other				5.7			5.7
Deconsolidation of investment products				(2.1		)	(2.1		)
Balance at March 31, 2018	$	10,058.4		$	343.8		$	10,402.2



(in millions)	Franklin Resources, Inc. Stockholders’ Equity			Nonredeemable Noncontrolling Interests			Total Stockholders’ Equity
for the six months ended March 31, 2017	Franklin Resources, Inc. Stockholders’ Equity			Nonredeemable Noncontrolling Interests			Total Stockholders’ Equity
Balance at October 1, 2016	$	11,935.8		$	592.4		$	12,528.2
Adoption of new accounting guidance	(1.3		)	(324.6		)	(325.9		)
Net income (loss)	860.9			(3.9		)	857.0
Other comprehensive loss	(18.7		)				(18.7		)
Cash dividends declared on common stock	(226.3		)				(226.3		)
Repurchase of common stock	(428.5		)				(428.5		)
Stock-based compensation	71.7						71.7
Net subscriptions and other				15.7			15.7
Balance at March 31, 2017	$	12,193.6		$	279.6		$	12,473.2

During the three and six months ended March 31, 2018, the Company repurchased 11.1 million and 15.7 million shares of its common stock at a cost of $432.6 million and $632.6 million under its stock repurchase program. At March 31, 2018, 15.9 million shares remained available for repurchase under the program, which is not subject to an expiration date. On April 11, 2018, the Company’s Board of Directors authorized the Company to repurchase, from time to time, up to an additional 80.0 million shares of its common stock in either open market or private transactions. Shares repurchased under the stock repurchase program are retired. During the three and six months ended March 31, 2017, the Company repurchased 4.0 million and 11.1 million shares of its common stock at a cost of $166.8 million and $428.5 million.

Earnings (Loss) per Share

6 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings (Loss) per Share

The components of basic and diluted earnings (loss) per share were as follows:



(in millions, except per share data)	Three Months Ended March 31,				Six Months Ended March 31,
(in millions, except per share data)	2018		2017		2018			2017
Net income (loss) attributable to Franklin Resources, Inc.	$	443.2	$	420.7	$	(140.1	)	$	860.9
Less: allocation of earnings to participating nonvested stock and stock unit awards	15.2		3.5		16.3			6.4
Net Income (Loss) Available to Common Stockholders	$	428.0	$	417.2	$	(156.4	)	$	854.5

Weighted-average shares outstanding – basic	545.0		560.3		547.9			562.7
Dilutive effect of nonparticipating nonvested stock unit awards	0.5		0.3		—			0.2
Weighted-Average Shares Outstanding – Diluted	545.5		560.6		547.9			562.9

Earnings (Loss) per Share
Basic	$	0.79	$	0.74	$	(0.29	)	$	1.52
Diluted	0.78		0.74		(0.29		)	1.52

Nonparticipating nonvested stock unit awards excluded from the calculation of diluted earnings (loss) per share because their effect would have been antidilutive were insignificant and 1.9 million for the three and six months ended March 31, 2018, and 0.2 million and 0.7 million for the three and six months ended March 31, 2017.

Investments

6 Months Ended

Mar. 31, 2018

Investments [Abstract]

Investments

The disclosures below include details of the Company’s investments, excluding those of consolidated investment products. See Note 7 – Consolidated Investment Products for information related to the investments held by these entities.

Investments consisted of the following:



(in millions)	March 31, 2018		September 30, 2017
Investment securities, trading
Sponsored funds	$	78.6	$	31.1
Debt and other equity securities	271.0		283.4
Total investment securities, trading	349.6		314.5
Investment securities, available-for-sale
Sponsored funds	86.0		110.8
Debt and other equity securities	1.7		1.9
Total investment securities, available-for-sale	87.7		112.7
Investments in equity method investees	1,043.0		893.5
Other investments	98.7		72.9
Total	$	1,579.0	$	1,393.6

Debt and other equity trading securities consist primarily of corporate debt.

Investment securities with aggregate carrying amounts of $1.2 million and $0.8 million were pledged as collateral at March 31, 2018 and September 30, 2017.

Gross unrealized gains and losses relating to investment securities, available-for-sale were as follows:



(in millions)	Cost Basis		Gross Unrealized					Fair Value
(in millions)	Cost Basis		Gains		Losses			Fair Value
as of March 31, 2018
Sponsored funds	$	80.4	$	11.1	$	(5.5	)	$	86.0
Debt and other equity securities	1.6		0.1		—			1.7
Total	$	82.0	$	11.2	$	(5.5	)	$	87.7

as of September 30, 2017
Sponsored funds	$	107.9	$	9.4	$	(6.5	)	$	110.8
Debt and other equity securities	1.9		—		—			1.9
Total	$	109.8	$	9.4	$	(6.5	)	$	112.7

Gross unrealized losses relating to investment securities, available-for-sale aggregated by length of time that individual securities have been in a continuous unrealized loss position were as follows:



(in millions)	Less Than 12 Months					12 Months or Greater					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
as of March 31, 2018
Sponsored funds	$	27.3	$	(5.5	)	$	—	$	—		$	27.3	$	(5.5	)

as of September 30, 2017
Sponsored funds	$	28.4	$	(6.3	)	$	2.4	$	(0.2	)	$	30.8	$	(6.5	)

The Company recognized $0.1 million and $0.6 million of other-than-temporary impairment during the three and six months ended March 31, 2018. During the six months ended March 31, 2017, the Company recognized $0.3 million of other-than-temporary impairment, none of which was recognized during the three months ended March 31, 2017.

Fair Value Measurements

6 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements

The disclosures below include details of the Company’s fair value measurements, excluding those of consolidated investment products. See Note 7 – Consolidated Investment Products for information related to fair value measurements of the assets and liabilities of these entities.

The assets and liability measured at fair value on a recurring basis were as follows:



(in millions)	Level 1		Level 2		Level 3		Total
as of March 31, 2018	Level 1		Level 2		Level 3		Total
Assets
Investment securities, trading
Sponsored funds	$	78.6	$	—	$	—	$	78.6
Debt and other equity securities	20.0		55.4		195.6		271.0
Investment securities, available-for-sale
Sponsored funds	86.0		—		—		86.0
Debt and other equity securities	0.9		0.5		0.3		1.7
Life settlement contracts	—		—		12.2		12.2
Total Assets Measured at Fair Value	$	185.5	$	55.9	$	208.1	$	449.5

Liability
Contingent consideration liability	$	—	$	—	$	31.2	$	31.2



(in millions)	Level 1		Level 2		Level 3		Total
as of September 30, 2017	Level 1		Level 2		Level 3		Total
Assets
Investment securities, trading
Sponsored funds	$	31.1	$	—	$	—	$	31.1
Debt and other equity securities	18.2		78.4		186.8		283.4
Investment securities, available-for-sale
Sponsored funds	110.8		—		—		110.8
Debt and other equity securities	1.0		0.6		0.3		1.9
Life settlement contracts	—		—		12.8		12.8
Total Assets Measured at Fair Value	$	161.1	$	79.0	$	199.9	$	440.0

Liability
Contingent consideration liability	$	—	$	—	$	51.0	$	51.0

Level 1 assets consist primarily of sponsored funds and other equity securities for which the fair values are based on published net asset values or quoted market prices. Level 2 assets consist of debt and equity securities for which the fair values are determined using independent third-party broker or dealer price quotes. Level 3 assets consist of corporate debt securities for which the fair value is determined using market pricing, and other debt securities and life settlement contracts for which the fair values are based on discounted cash flows using significant unobservable inputs.

The fair value of the contingent consideration liability is determined using an income-based method which considers the net present value of anticipated future cash flows.

Transfers into Level 2 from Level 1 were $0.5 million for the three and six months ended March 31, 2018, and related to securities for which the quoted market prices were adjusted as of March 31, 2018 due to significant price changes in U.S.-traded market proxies resulting from global market volatility. The adjustments were made after the close of foreign markets and were based on third-party factors derived from model-based valuation techniques for which the significant assumptions were observable in the market. There were no transfers into Level 1 from Level 2, or into or out of Level 3, during the six months ended March 31, 2018. There were no transfers between Level 1 and Level 2, or into Level 3, during the six months ended March 31, 2017.

Changes in the Level 3 assets and liabilities were as follows:



	2018						2017
(in millions)	Investments			Contingent Consideration Liability			Investments			Contingent Consideration Liabilities
for the three months ended March 31,	Investments			Contingent Consideration Liability			Investments			Contingent Consideration Liabilities
Balance at beginning of period	$	210.1		$	(62.0	)	$	198.7		$	(83.7	)
Acquisition	—			—			—			(5.7		)
Total realized and unrealized gains (losses)
Included in investment and other income, net	1.8			—			5.0			—
Included in general, administrative and other expense	—			(1.6		)	—			(4.2		)
Purchases	1.4			—			0.3			—
Settlements	(1.9		)	32.4			(0.8		)	33.2
Transfers out of Level 3	—			—			(0.4		)	—
Foreign exchange revaluation and other	(3.3		)	—			8.2			—
Balance at End of Period	$	208.1		$	(31.2	)	$	211.0		$	(60.4	)
Change in unrealized gains (losses) included in net income relating to assets and liabilities held at end of period	$	0.8		$	(1.6	)	$	4.4		$	(4.2	)



	2018						2017
(in millions)	Investments			Contingent Consideration Liability			Investments			Contingent Consideration Liabilities
for the six months ended March 31,	Investments			Contingent Consideration Liability			Investments			Contingent Consideration Liabilities
Balance at beginning of period	$	199.9		$	(51.0	)	$	205.1		$	(98.1	)
Acquisition	—			—			—			(5.7		)
Total realized and unrealized gains (losses)
Included in investment and other income, net	3.0			—			5.6			—
Included in general, administrative and other expense	—			(5.6		)	—			8.0
Purchases	6.7			—			0.8			—
Sales	—			—			(2.4		)	—
Settlements	(1.9		)	32.4			(2.5		)	35.4
Transfers out of Level 3	—			—			(0.4		)	—
Foreign exchange revaluation and other	0.4			(7.0		)	4.8			—
Balance at End of Period	$	208.1		$	(31.2	)	$	211.0		$	(60.4	)
Change in unrealized gains (losses) included in net income relating to assets and liabilities held at end of period	$	2.0		$	(5.6	)	$	4.2		$	8.0

Valuation techniques and significant unobservable inputs used in the Level 3 fair value measurements were as follows:



(in millions)
as of March 31, 2018	Fair Value		Valuation Technique	Significant Unobservable Inputs	Range (Weighted Average)
Investment securities, trading – debt and other equity securities	$	178.7	Market pricing	Redemption price	$73 per $100 of par
				Discount rate	18.1%
	16.9		Discounted cash flow	Discount rate	3.0%–6.7% (5.3%)
				Risk premium	2.0%–4.7% (3.2%)

Life settlement contracts	12.2		Discounted cash flow	Life expectancy	21–119 months (62)
				Discount rate	8.0%–20.0% (13.0%)

Contingent consideration liability	31.2		Discounted cash flow	AUM growth rate	(4.0%)
				Discount rate	14.9%



(in millions)
as of September 30, 2017	Fair Value		Valuation Technique	Significant Unobservable Inputs	Range (Weighted Average)
Investment securities, trading – debt and other equity securities	$	175.7	Market pricing	Redemption price	$73 per $100 of par
				Discount rate	18.6%
	11.1		Discounted cash flow	Discount rate	4.1%–6.7% (5.7%)
				Risk premium	2.0%–4.1% (2.9%)

Life settlement contracts	12.8		Discounted cash flow	Life expectancy	20–123 months (62)
				Discount rate	8.0%–20.0% (13.2%)

Contingent consideration liability	51.0		Discounted cash flow	AUM growth rate	1.3%–9.4% (5.3%)
				Discount rate	14.6%

For investment securities, trading – debt and other equity securities using the market pricing technique, a significant increase (decrease) in the redemption price in isolation would result in a significantly higher (lower) fair value measurement, while a significant increase (decrease) in the discount rate in isolation would result in a significantly lower (higher) fair value measurement.

For investment securities, trading – debt and other equity securities using the discounted cash flow technique, a significant increase (decrease) in the discount rate or risk premium in isolation would result in a significantly lower (higher) fair value measurement.

For life settlement contracts, a significant increase (decrease) in the life expectancy or the discount rate in isolation would result in a significantly lower (higher) fair value measurement.

For the contingent consideration liability, a significant increase (decrease) in the assets under management (“AUM”) growth rate, or decrease (increase) in the discount rate, in isolation would result in a significantly higher (lower) fair value measurement.

Financial instruments that were not measured at fair value were as follows:



(in millions)	Fair Value Level	March 31, 2018				September 30, 2017
(in millions)	Fair Value Level	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Financial Assets
Cash and cash equivalents	1	$	8,545.4	$	8,545.4	$	8,523.3	$	8,523.3
Other investments
Time deposits	2	30.9		30.9		13.4		13.4
Cost method investments	3	55.6		78.6		46.7		67.7

Financial Liability
Debt	2	$	1,044.8	$	1,044.0	$	1,044.2	$	1,073.5

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Consolidated Investment Products

6 Months Ended

Mar. 31, 2018

Consolidated Investment Products [Abstract]

Consolidated Investment Products

Consolidated investment products (“CIPs”) consist of mutual and other investment funds, limited partnerships and similar structures, substantially all of which are sponsored by the Company, and include both voting interest entities and variable interest entities. The Company had 54 and 58 CIPs as of March 31, 2018 and September 30, 2017.

The balances related to CIPs included in the Company’s consolidated balance sheets were as follows:



(in millions)	March 31, 2018		September 30, 2017
Assets
Cash and cash equivalents	$	181.1	$	226.4
Receivables	133.6		234.1
Investments, at fair value	3,529.3		3,467.4
Other assets	1.0		0.9
Total Assets	$	3,845.0	$	3,928.8

Liabilities
Accounts payable and accrued expenses	$	67.9	$	124.1
Debt	34.0		53.4
Other liabilities	11.9		8.7
Total liabilities	113.8		186.2
Redeemable Noncontrolling Interests	2,084.4		1,941.9
Stockholders’ Equity
Franklin Resources, Inc.’s interests	1,330.0		1,511.8
Nonredeemable noncontrolling interests	316.8		288.9
Total stockholders’ equity	1,646.8		1,800.7
Total Liabilities, Redeemable Noncontrolling Interests and Stockholders’ Equity	$	3,845.0	$	3,928.8

The CIPs did not have a significant impact on net income (loss) attributable to the Company during the three and six months ended March 31, 2018 and 2017.

The Company has no right to the CIPs’ assets, other than its direct equity investments in them and investment management fees earned from them. The debt holders of the CIPs have no recourse to the Company’s assets beyond the level of its direct investment, therefore the Company bears no other risks associated with the CIPs’ liabilities.

Investment products are typically consolidated when the Company makes an initial investment in a newly launched investment entity. They are typically deconsolidated when the Company no longer has a controlling financial interest due to redemptions of its investment or increases in third-party investments. The Company’s investments in these products subsequent to deconsolidation are accounted for as trading or available-for-sale investment securities, or equity method or cost method investments depending on the structure of the product and the Company’s role and level of ownership.

Investments

Investments of CIPs consisted of the following:



(in millions)	March 31, 2018		September 30, 2017
Investment securities, trading	$	3,063.7	$	3,017.2
Other equity securities	353.9		306.9
Other debt securities	111.7		143.3
Total	$	3,529.3	$	3,467.4

Investment securities, trading consist of debt and equity securities that are traded in active markets. Other equity securities consist of equity securities of entities in emerging markets and fund products. Other debt securities consist of debt securities of entities in emerging markets.

Fair Value Measurements

Assets and liabilities of CIPs measured at fair value on a recurring basis were as follows:



(in millions)	Level 1		Level 2		Level 3		NAV as a Practical Expedient		Total
as of March 31, 2018	Level 1		Level 2		Level 3		NAV as a Practical Expedient		Total
Assets
Investments
Equity securities	$	312.7	$	266.6	$	188.4	$	167.1	$	934.8
Debt securities	1.3		2,481.0		112.2		—		2,594.5
Total Assets Measured at Fair Value	$	314.0	$	2,747.6	$	300.6	$	167.1	$	3,529.3

Liabilities
Other liabilities	$	0.6	$	11.3	$	—	$	—	$	11.9



(in millions)	Level 1		Level 2		Level 3		NAV as a Practical Expedient		Total
as of September 30, 2017	Level 1		Level 2		Level 3		NAV as a Practical Expedient		Total
Assets
Investments
Equity securities	$	331.4	$	128.1	$	160.7	$	155.2	$	775.4
Debt securities	1.4		2,555.2		135.4		—		2,692.0
Total Assets Measured at Fair Value	$	332.8	$	2,683.3	$	296.1	$	155.2	$	3,467.4

Liabilities
Other liabilities	$	0.4	$	8.3	$	—	$	—	$	8.7

Level 1 assets consist of equity and debt securities for which the fair values are based on quoted market prices. Level 2 assets consist of debt and equity securities for which the fair values are determined using independent third-party broker or dealer price quotes. Level 3 assets consist of equity and debt securities of entities in emerging markets for which the fair values are determined using significant unobservable inputs in either a market-based or income-based approach.

The fair value of other liabilities, which consist of short positions in debt and equity securities, is determined based on the fair value of the underlying securities using quoted market prices, or independent third-party broker or dealer price quotes if quoted market prices are not available.

Transfers into Level 2 from Level 1 were $3.5 million for the three and six months ended March 31, 2018, and related to securities for which the quoted market prices were adjusted as of March 31, 2018 due to significant price changes in U.S.-traded market proxies resulting from global market volatility. The impacted securities trade in 11 different countries in Asia-Pacific, Europe and Latin America. The adjustments were made after the close of the foreign markets and were based on third-party factors derived from model-based valuation techniques for which the significant assumptions were observable in the market. There were no transfers into Level 1 from Level 2 during the six months ended March 31, 2018, and there were no transfers between Level 1 and Level 2 during the six months ended March 31, 2017. There were no transfers into or out of Level 3 during the six months ended March 31, 2018 and 2017.

Investments for which fair value was estimated using reported net asset value (“NAV”) as a practical expedient consisted of nonredeemable real estate and private equity funds. These investments are expected to be returned through distributions as a result of liquidations of the funds’ underlying assets over a weighted-average period of 4.0 years and 4.4 years at March 31, 2018 and September 30, 2017. The CIPs’ unfunded commitments to these funds totaled $1.9 million, of which the Company was contractually obligated to fund $0.4 million based on its ownership percentage in the CIPs, at both March 31, 2018 and September 30, 2017.

Changes in Level 3 assets were as follows:



	2018								2017
(in millions)	Equity Securities		Debt Securities			Total Level 3 Assets			Equity Securities		Debt Securities			Total Level 3 Assets
for the three months ended March 31,	Equity Securities		Debt Securities			Total Level 3 Assets			Equity Securities		Debt Securities			Total Level 3 Assets
Balance at beginning of period	$	159.6	$	136.2		$	295.8		$	131.6	$	124.4		$	256.0
Realized and unrealized gains (losses) included in investment and other income, net	15.6		2.0			17.6			4.2		(14.2		)	(10.0		)
Purchases	11.5		10.5			22.0			4.5		5.6			10.1
Sales	—		(37.7		)	(37.7		)	—		(1.9		)	(1.9		)
Foreign exchange revaluation	1.7		1.2			2.9			0.4		0.5			0.9
Balance at End of Period	$	188.4	$	112.2		$	300.6		$	140.7	$	114.4		$	255.1
Change in unrealized gains (losses) included in net income relating to assets held at end of period	$	15.4	$	—		$	15.4		$	4.2	$	(14.3	)	$	(10.1	)



	2018									2017
(in millions)	Equity Securities			Debt Securities			Total Level 3 Assets			Equity Securities			Debt Securities			Total Level 3 Assets
for the six months ended March 31,	Equity Securities			Debt Securities			Total Level 3 Assets			Equity Securities			Debt Securities			Total Level 3 Assets
Balance at beginning of period	$	160.7		$	135.4		$	296.1		$	160.3		$	132.3		$	292.6
Adoption of new accounting guidance	—			—			—			(45.4		)	(0.5		)	(45.9		)
Realized and unrealized gains (losses) included in investment and other income, net	17.5			2.1			19.6			0.9			(14.5		)	(13.6		)
Purchases	22.6			10.5			33.1			25.5			7.8			33.3
Sales	(14.9		)	(37.7		)	(52.6		)	(0.1		)	(8.3		)	(8.4		)
Foreign exchange revaluation	2.5			1.9			4.4			(0.5		)	(2.4		)	(2.9		)
Balance at End of Period	$	188.4		$	112.2		$	300.6		$	140.7		$	114.4		$	255.1
Change in unrealized gains (losses) included in net income relating to assets held at end of period	$	16.3		$	0.1		$	16.4		$	0.8		$	(15.0	)	$	(14.2	)

Valuation techniques and significant unobservable inputs used in Level 3 fair value measurements were as follows:



(in millions)
as of March 31, 2018	Fair Value		Valuation Technique	Significant Unobservable Inputs	Range (Weighted Average)
Equity securities	$	160.9	Market comparable companies	EBITDA multiple	5.0–13.6 (9.1)
Equity securities	27.5		Discounted cash flow	Discount rate	5.7%–16.5% (13.5%)

Debt securities	77.8		Discounted cash flow	Discount rate	5.7%–14.6% (10.0%)
	31.1		Comparable trading multiple	Price to earnings ratio	10.0
	31.1		Comparable trading multiple	Enterprise value/ EBITDA multiple	20.9
	3.3		Market pricing	Private sale pricing	$33 per $100 of par



(in millions)
as of September 30, 2017	Fair Value		Valuation Technique	Significant Unobservable Inputs	Range (Weighted Average)
Equity securities	$	101.9	Market comparable companies	EBITDA multiple	5.5–12.3 (9.0)
	44.4		Discounted cash flow	Discount rate	5.7%–17.9% (14.3%)
	14.4		Market pricing	Price to earnings ratio	10.0

Debt securities	112.7		Discounted cash flow	Discount rate	5.0%–33.0% (9.5%)
	112.7		Discounted cash flow	Risk premium	0.0%–25.0% (8.4%)
	22.7		Market pricing	Private sale pricing	$33–$57 ($52) per $100 of par

For securities using the market comparable companies valuation technique, a significant increase (decrease) in the EBITDA multiple in isolation would result in a significantly higher (lower) fair value measurement.

For securities using the discounted cash flow valuation technique, a significant increase (decrease) in the discount rate or risk premium in isolation would result in a significantly lower (higher) fair value measurement.

For securities using the comparable trading multiple valuation technique, a significant increase (decrease) in the price to earnings ratio or enterprise value/EBITDA multiple in isolation would result in a significantly higher (lower) fair value measurement.

For securities using the market pricing valuation technique, a significant increase (decrease) in the private sale pricing or price to earnings ratio in isolation would result in a significantly higher (lower) fair value measurement.

Financial instruments of CIPs that were not measured at fair value were as follows:



(in millions)	Fair Value Level	March 31, 2018				September 30, 2017
(in millions)	Fair Value Level	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Financial Asset
Cash and cash equivalents	1	$	181.1	$	181.1	$	226.4	$	226.4
Financial Liability
Debt	3	$	34.0	$	33.7	$	53.4	$	53.1

Debt

Debt of CIPs totaled $34.0 million and $53.4 million at March 31, 2018 and September 30, 2017. The debt had fixed and floating interest rates ranging from 3.07% to 7.13% with a weighted-average effective interest rate of 6.25% at March 31, 2018, and from 2.84% to 6.75% with a weighted-average effective interest rate of 5.15% at September 30, 2017. The debt carried at March 31, 2018 matures in fiscal year 2019.

Redeemable Noncontrolling Interests

Changes in redeemable noncontrolling interests of CIPs were as follows:



(in millions)
for the six months ended March 31,	2018		2017
Balance at beginning of period	$	1,941.9	$	61.1
Adoption of new accounting guidance	—		824.7
Net income (loss)	26.7		(3.2		)
Net subscriptions and other	115.8		349.2
Net consolidations	—		428.0
Balance at End of Period	$	2,084.4	$	1,659.8

Nonconsolidated Variable Interest Entities

6 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nonconsolidated Variable Interest Entities

Variable interest entities (“VIEs”) for which the Company is not the primary beneficiary consist of sponsored funds and other investment products in which the Company has an equity ownership interest. The Company’s maximum exposure to loss from these VIEs consists of investment management fee receivables and equity investments as follows:



(in millions)	March 31, 2018		September 30, 2017
Receivables	$	156.7	$	155.6
Investments	72.4		129.3
Total	$	229.1	$	284.9

While the Company has no contractual obligation to do so, it routinely makes cash investments in the course of launching sponsored funds. The Company also may voluntarily elect to provide its sponsored funds with additional direct or indirect financial support based on its business objectives. The Company did not provide financial or other support to its sponsored funds during the six months ended March 31, 2018 or fiscal year 2017.

Taxes on Income

6 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Taxes on Income

The Tax Cuts and Jobs Act (the “Tax Act”) was enacted into law in the U.S. on December 22, 2017. The Tax Act includes various changes to the tax law, including a permanent reduction in the corporate income tax rate.

The Tax Act imposes a one-time transition tax on the deemed repatriation of post-1986 undistributed foreign subsidiaries’ earnings. During the quarter ended December 31, 2017, the Company recognized an estimated transition tax expense of $1,120.7 million based on information then available. During the three months ended March 31, 2018, the Company decreased this estimate by $0.5 million as a result of additional technical guidance from the Department of Treasury and information that became available during the quarter. The expense may be further adjusted in future quarters upon issuance of additional technical guidance, legislative updates from states on tax reform, and the completion of the Company’s tax return filings. The federal portion of the transition tax liability, estimated to be $1,101.0 million, will be paid over eight years beginning in January 2019, with 8% of the liability payable in each of the first five years, 15% in year six, 20% in year seven and 25% in year eight.

The Tax Act reduced the federal corporate income tax rate from 35% to 21% effective January 1, 2018. The Company’s federal statutory rate for the fiscal year ending September 30, 2018 is a blended rate of 24.5%, based on the pre- and post-Tax Act rates, and will be 21% for future fiscal years. During the quarter ended December 31, 2017, the Company recognized the estimated related changes in its deferred tax assets and deferred tax liabilities, which resulted in a $35.7 million decrease in deferred tax assets, an $88.8 million decrease in deferred tax liabilities and a $53.1 million net tax benefit. During the three months ended March 31, 2018, the estimated net tax benefit increased by $0.5 million, and may be further revised in future quarters as the related temporary differences are realized or settled. Also during the three months ended March 31, 2018, the Company reclassified $0.1 million from accumulated other comprehensive loss to retained earnings related to stranded tax effects resulting from the change in tax rate.

Deferred tax assets and deferred tax liabilities were as follows:



(in millions)	March 31, 2018		September 30, 2017
Deferred tax assets, net of valuation allowance	$	95.2	$	141.3
Deferred tax liabilities	204.2		296.1
Net Deferred Tax Liability	$	109.0	$	154.8

Deferred income tax assets and liabilities that relate to the same tax jurisdiction are presented net on the consolidated balance sheets. The components of the net deferred tax liability were classified in the consolidated balance sheets as follows:



(in millions)	March 31, 2018		September 30, 2017
Other assets	$	20.9	$	15.8
Deferred tax liabilities	129.9		170.6
Net Deferred Tax Liability	$	109.0	$	154.8

Prior to the Tax Act, the Company indefinitely reinvested the undistributed earnings of all its foreign subsidiaries, except for income previously taxed in the U.S. or subject to regulatory or legal repatriation restrictions or requirements. The Company is currently reconsidering its repatriation policy in light of the changes contained in the Tax Act.

The Company’s effective income tax rate was 23.7% and 106.9% for the three and six months ended March 31, 2018, and is expected to be approximately 70% for the full fiscal year 2018.

Taxes on income and the related impacts on the effective income tax rate were as follows:



(in millions)	Three Months Ended March 31, 2018					Six Months Ended March 31, 2018
(in millions)	Amount			Percentage of Income Before Taxes		Amount			Percentage of Income Before Taxes
Tax expense before one-time charges	$	151.0		23.9	%	$	305.6		23.8	%
Transition tax on deemed repatriation of undistributed foreign earnings	(0.5		)	(0.1	%)	1,120.2			87.2	%
Revaluation of net deferred tax liabilities	(0.5		)	(0.1	%)	(53.6		)	(4.2	%)
Other Tax Act impacts	0.2			0.0	%	1.5			0.1	%
Total	$	150.2		23.7	%	$	1,373.7		106.9	%

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings On July 28, 2016, a former employee filed a class action lawsuit captioned Cryer v. Franklin Resources, Inc., et al. in the United States District Court for the Northern District of California against Franklin, the Franklin Templeton 401(k) Retirement Plan (“Plan”) Investment Committee (“Investment Committee”), and unnamed Investment Committee members. The plaintiff asserts a claim for breach of fiduciary duty under the Employee Retirement Income Security Act (“ERISA”), alleging that the defendants selected mutual funds sponsored and managed by the Company (the “Funds”) as investment options for the Plan when allegedly lower-cost and better performing non-proprietary investment vehicles were available. The plaintiff also claims that the total Plan costs, inclusive of investment management and administrative fees, are excessive. The plaintiff alleges that Plan losses exceed $79.0 million and seeks, among other things, damages, disgorgement, rescission of the Plan’s investments in the Funds, attorneys’ fees and costs, and pre- and post-judgment interest. On November 2, 2017, a second former employee, represented by the same law firm, filed another putative class action lawsuit relating to the Plan in the same court, captioned Fernandez v. Franklin Resources Inc., et al. The plaintiff filed an amended complaint on February 6, 2018 naming the same defendants as those named in the Cryer action, as well as the Franklin Board of Directors, the Plan Administrative Committee, individual current and former Franklin directors, and individual current and former Investment Committee members. The plaintiff in this second lawsuit asserts the same ERISA breach of fiduciary duty claim asserted in the Cryer action, as well as claims for alleged prohibited transactions by virtue of the Plan’s investments in the Funds and for an alleged failure to monitor the performance of the Investment Committee. The plaintiff alleges that Plan losses exceed $60.0 million and seeks the same relief sought in the Cryer action, on behalf of the same class. On April 6, 2018, the court consolidated the Fernandez action with the existing Cryer action. Management strongly believes that the claims asserted in the litigation are without merit. The fact discovery phase in the consolidated action is closed and the parties are currently in the expert discovery phase. Franklin is defending against the consolidated action vigorously. Franklin cannot at this time predict the eventual outcome of the litigation or whether it will have a material negative impact on the Company, or reasonably estimate the possible loss or range of loss that may arise from any negative outcome. The Company is from time to time involved in other litigation relating to claims arising in the normal course of business. Management is of the opinion that the ultimate resolution of such claims will not materially affect the Company’s business, financial position, results of operations or liquidity. In management’s opinion, an adequate accrual has been made as of March 31, 2018 to provide for any probable losses that may arise from such matters for which the Company could reasonably estimate an amount. Other Commitments and Contingencies At March 31, 2018, there were no material changes in the other commitments and contingencies as reported in the Company’s Form 10-K for fiscal year 2017.

Stock-Based Compensation

6 Months Ended

Mar. 31, 2018

Share-based Compensation [Abstract]

Stock-Based Compensation

Stock and stock unit award activity was as follows:



(shares in thousands)	Time-Based Shares		Performance- Based Shares		Total Shares		Weighted-Average Grant-Date Fair Value
for the six months ended March 31, 2018	Time-Based Shares		Performance- Based Shares		Total Shares		Weighted-Average Grant-Date Fair Value
Nonvested balance at October 1, 2017	2,783		1,761		4,544		$	37.23
Granted	2,243		714		2,957		42.76
Vested	(140	)	(512	)	(652	)	39.22
Forfeited/canceled	(146	)	(138	)	(284	)	45.99
Nonvested Balance at March 31, 2018	4,740		1,825		6,565		$	39.14

Total unrecognized compensation expense related to nonvested stock and stock unit awards was $180.6 million at March 31, 2018. This expense is expected to be recognized over a remaining weighted-average vesting period of 1.9 years.

Other Income (Expenses)

6 Months Ended

Mar. 31, 2018

Other Income and Expenses [Abstract]

Other Income (Expenses)

Other income (expenses) consisted of the following:



	Three Months Ended March 31,						Six Months Ended March 31,
(in millions)	2018			2017			2018			2017
Investment and Other Income, Net
Interest income	$	25.7		$	16.0		$	49.5		$	29.6
Dividend income	8.7			2.7			13.4			5.1
Gains on trading investment securities, net	1.8			8.4			2.5			10.4
Realized gains on sale of investment securities, available-for-sale	2.1			2.3			2.1			2.9
Realized losses on sale of investment securities, available-for-sale	(0.4		)	(0.5		)	(0.4		)	(1.2		)
Income from investments in equity method investees	10.7			36.3			45.9			70.5
Other-than-temporary impairment of investments	(0.1		)	—			(0.6		)	(0.3		)
Gains (losses) on investments of CIPs, net	38.6			22.7			54.6			(7.2		)
Foreign currency exchange gains (losses), net	(7.8		)	(6.2		)	(10.7		)	13.6
Other, net	8.1			2.9			12.4			7.3
Total	87.4			84.6			168.7			130.7
Interest Expense	(10.0		)	(12.6		)	(20.8		)	(25.9		)
Other Income, Net	$	77.4		$	72.0		$	147.9		$	104.8

Interest income was primarily generated by cash equivalents and trading investment securities. Substantially all of the dividend income and realized gains and losses on sale of available-for-sale securities were generated by investments in nonconsolidated funds. Proceeds from the sale of available-for-sale securities were $25.4 million and $41.4 million for the three and six months ended March 31, 2018, and $17.2 million and $25.8 million for the three and six months ended March 31, 2017.

Net gains recognized on the Company’s trading investment securities that were held at March 31, 2018 and 2017 were $2.1 million and $3.3 million for the three and six months ended March 31, 2018, and $1.2 million and $1.4 million for the three and six months ended March 31, 2017. Net gains (losses) recognized on trading investment securities of CIPs that were held at March 31, 2018 and 2017 were $(30.1) million and $(10.0) million for the three and six months ended March 31, 2018, and $27.0 million and $8.4 million for the three and six months ended March 31, 2017.

Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Income (Loss)

Changes in accumulated other comprehensive income (loss) by component were as follows:



(in millions)	Unrealized Gains on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
for the three months ended March 31, 2018	Unrealized Gains on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
Balance at January 1, 2018	$	5.7		$	(265.2	)	$	(7.1	)	$	(266.6	)
Adoption of new accounting guidance	—			—			(0.1		)	(0.1		)
Other comprehensive income (loss)
Other comprehensive income before reclassifications, net of tax	1.5			8.3			0.4			10.2
Reclassifications to net investment and other income, net of tax	(1.7		)	(1.5		)	—			(3.2		)
Total other comprehensive income (loss)	(0.2		)	6.8			0.4			7.0
Balance at March 31, 2018	$	5.5		$	(258.4	)	$	(6.8	)	$	(259.7	)



(in millions)	Unrealized Gains on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
for the six months ended March 31, 2018	Unrealized Gains on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
Balance at October 1, 2017	$	2.2		$	(281.0	)	$	(6.0	)	$	(284.8	)
Adoption of new accounting guidance	—			—			(0.1		)	(0.1		)
Other comprehensive income (loss)
Other comprehensive income (loss) before reclassifications, net of tax	5.0			24.1			(0.7		)	28.4
Reclassifications to net investment and other income, net of tax	(1.7		)	(1.5		)	—			(3.2		)
Total other comprehensive income (loss)	3.3			22.6			(0.7		)	25.2
Balance at March 31, 2018	$	5.5		$	(258.4	)	$	(6.8	)	$	(259.7	)



(in millions)	Unrealized Gains (Losses) on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
for the three months ended March 31, 2017	Unrealized Gains (Losses) on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
Balance at January 1, 2017	$	(2.4	)	$	(407.3	)	$	(8.1	)	$	(417.8	)
Other comprehensive income
Other comprehensive income before reclassifications, net of tax	6.6			39.2			—			45.8
Reclassifications to net investment and other income, net of tax	(1.2		)	—			—			(1.2		)
Total other comprehensive income	5.4			39.2			—			44.6
Balance at March 31, 2017	$	3.0		$	(368.1	)	$	(8.1	)	$	(373.2	)



(in millions)	Unrealized Gains on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
for the six months ended March 31, 2017	Unrealized Gains on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
Balance at October 1, 2016	$	6.8		$	(346.1	)	$	(8.1	)	$	(347.4	)
Adoption of new accounting guidance	(6.8		)	(0.3		)	—			(7.1		)
Other comprehensive income (loss)
Other comprehensive income (loss) before reclassifications, net of tax	4.0			(21.7		)	—			(17.7		)
Reclassifications to net investment and other income, net of tax	(1.0		)	—			—			(1.0		)
Total other comprehensive income (loss)	3.0			(21.7		)	—			(18.7		)
Balance at March 31, 2017	$	3.0		$	(368.1	)	$	(8.1	)	$	(373.2	)

Subsequent Event	6 Months Ended
Subsequent Event	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event On April 20, 2018, the Company gave notice that on May 21, 2018 it will redeem all of its outstanding $350.0 million 4.625% senior notes due in May 2020. The make-whole redemption price is expected to approximate $363 million.

Fair Value Measurements Accounting Policies (Policies)	6 Months Ended
Fair Value Measurements Accounting Policies (Policies)	Mar. 31, 2018
Accounting Policies [Abstract]
Fair Value Measurements	Level 1 assets consist primarily of sponsored funds and other equity securities for which the fair values are based on published net asset values or quoted market prices. Level 2 assets consist of debt and equity securities for which the fair values are determined using independent third-party broker or dealer price quotes. Level 3 assets consist of corporate debt securities for which the fair value is determined using market pricing, and other debt securities and life settlement contracts for which the fair values are based on discounted cash flows using significant unobservable inputs. The fair value of the contingent consideration liability is determined using an income-based method which considers the net present value of anticipated future cash flows.

Stockholders' Equity (Tables)

6 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

Changes in total stockholders' equity

Changes in total stockholders’ equity were as follows:



(in millions)	Franklin Resources, Inc. Stockholders’ Equity			Nonredeemable Noncontrolling Interests			Total Stockholders’ Equity
for the six months ended March 31, 2018	Franklin Resources, Inc. Stockholders’ Equity			Nonredeemable Noncontrolling Interests			Total Stockholders’ Equity
Balance at October 1, 2017	$	12,620.0		$	315.8		$	12,935.8
Adoption of new accounting guidance	0.4			—			0.4
Net income (loss)	(140.1		)	24.4			(115.7		)
Other comprehensive income	25.2						25.2
Cash dividends declared on common stock	(1,889.4		)				(1,889.4		)
Repurchase of common stock	(632.6		)				(632.6		)
Stock-based compensation	74.9						74.9
Net subscriptions and other				5.7			5.7
Deconsolidation of investment products				(2.1		)	(2.1		)
Balance at March 31, 2018	$	10,058.4		$	343.8		$	10,402.2



(in millions)	Franklin Resources, Inc. Stockholders’ Equity			Nonredeemable Noncontrolling Interests			Total Stockholders’ Equity
for the six months ended March 31, 2017	Franklin Resources, Inc. Stockholders’ Equity			Nonredeemable Noncontrolling Interests			Total Stockholders’ Equity
Balance at October 1, 2016	$	11,935.8		$	592.4		$	12,528.2
Adoption of new accounting guidance	(1.3		)	(324.6		)	(325.9		)
Net income (loss)	860.9			(3.9		)	857.0
Other comprehensive loss	(18.7		)				(18.7		)
Cash dividends declared on common stock	(226.3		)				(226.3		)
Repurchase of common stock	(428.5		)				(428.5		)
Stock-based compensation	71.7						71.7
Net subscriptions and other				15.7			15.7
Balance at March 31, 2017	$	12,193.6		$	279.6		$	12,473.2

Earnings (Loss) per Share (Tables)

6 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Components of basic and diluted earnings (loss) per share

The components of basic and diluted earnings (loss) per share were as follows:



(in millions, except per share data)	Three Months Ended March 31,				Six Months Ended March 31,
(in millions, except per share data)	2018		2017		2018			2017
Net income (loss) attributable to Franklin Resources, Inc.	$	443.2	$	420.7	$	(140.1	)	$	860.9
Less: allocation of earnings to participating nonvested stock and stock unit awards	15.2		3.5		16.3			6.4
Net Income (Loss) Available to Common Stockholders	$	428.0	$	417.2	$	(156.4	)	$	854.5

Weighted-average shares outstanding – basic	545.0		560.3		547.9			562.7
Dilutive effect of nonparticipating nonvested stock unit awards	0.5		0.3		—			0.2
Weighted-Average Shares Outstanding – Diluted	545.5		560.6		547.9			562.9

Earnings (Loss) per Share
Basic	$	0.79	$	0.74	$	(0.29	)	$	1.52
Diluted	0.78		0.74		(0.29		)	1.52

Investments (Tables)

6 Months Ended

Mar. 31, 2018

Investments [Abstract]

Summary of investments

Investments consisted of the following:



(in millions)	March 31, 2018		September 30, 2017
Investment securities, trading
Sponsored funds	$	78.6	$	31.1
Debt and other equity securities	271.0		283.4
Total investment securities, trading	349.6		314.5
Investment securities, available-for-sale
Sponsored funds	86.0		110.8
Debt and other equity securities	1.7		1.9
Total investment securities, available-for-sale	87.7		112.7
Investments in equity method investees	1,043.0		893.5
Other investments	98.7		72.9
Total	$	1,579.0	$	1,393.6

Summary of the gross unrealized gains and losses relating to investment securities, available-for-sale

Gross unrealized gains and losses relating to investment securities, available-for-sale were as follows:



(in millions)	Cost Basis		Gross Unrealized					Fair Value
(in millions)	Cost Basis		Gains		Losses			Fair Value
as of March 31, 2018
Sponsored funds	$	80.4	$	11.1	$	(5.5	)	$	86.0
Debt and other equity securities	1.6		0.1		—			1.7
Total	$	82.0	$	11.2	$	(5.5	)	$	87.7

as of September 30, 2017
Sponsored funds	$	107.9	$	9.4	$	(6.5	)	$	110.8
Debt and other equity securities	1.9		—		—			1.9
Total	$	109.8	$	9.4	$	(6.5	)	$	112.7

Summary of gross unrealized losses and fair values of investment securities in a continuous unrealized loss position

Gross unrealized losses relating to investment securities, available-for-sale aggregated by length of time that individual securities have been in a continuous unrealized loss position were as follows:



(in millions)	Less Than 12 Months					12 Months or Greater					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
as of March 31, 2018
Sponsored funds	$	27.3	$	(5.5	)	$	—	$	—		$	27.3	$	(5.5	)

as of September 30, 2017
Sponsored funds	$	28.4	$	(6.3	)	$	2.4	$	(0.2	)	$	30.8	$	(6.5	)

Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of assets and liability measured at fair value on a recurring basis

The assets and liability measured at fair value on a recurring basis were as follows:



(in millions)	Level 1		Level 2		Level 3		Total
as of March 31, 2018	Level 1		Level 2		Level 3		Total
Assets
Investment securities, trading
Sponsored funds	$	78.6	$	—	$	—	$	78.6
Debt and other equity securities	20.0		55.4		195.6		271.0
Investment securities, available-for-sale
Sponsored funds	86.0		—		—		86.0
Debt and other equity securities	0.9		0.5		0.3		1.7
Life settlement contracts	—		—		12.2		12.2
Total Assets Measured at Fair Value	$	185.5	$	55.9	$	208.1	$	449.5

Liability
Contingent consideration liability	$	—	$	—	$	31.2	$	31.2



(in millions)	Level 1		Level 2		Level 3		Total
as of September 30, 2017	Level 1		Level 2		Level 3		Total
Assets
Investment securities, trading
Sponsored funds	$	31.1	$	—	$	—	$	31.1
Debt and other equity securities	18.2		78.4		186.8		283.4
Investment securities, available-for-sale
Sponsored funds	110.8		—		—		110.8
Debt and other equity securities	1.0		0.6		0.3		1.9
Life settlement contracts	—		—		12.8		12.8
Total Assets Measured at Fair Value	$	161.1	$	79.0	$	199.9	$	440.0

Liability
Contingent consideration liability	$	—	$	—	$	51.0	$	51.0

Schedule of changes in Level 3 assets and liabilities

Changes in the Level 3 assets and liabilities were as follows:



	2018						2017
(in millions)	Investments			Contingent Consideration Liability			Investments			Contingent Consideration Liabilities
for the three months ended March 31,	Investments			Contingent Consideration Liability			Investments			Contingent Consideration Liabilities
Balance at beginning of period	$	210.1		$	(62.0	)	$	198.7		$	(83.7	)
Acquisition	—			—			—			(5.7		)
Total realized and unrealized gains (losses)
Included in investment and other income, net	1.8			—			5.0			—
Included in general, administrative and other expense	—			(1.6		)	—			(4.2		)
Purchases	1.4			—			0.3			—
Settlements	(1.9		)	32.4			(0.8		)	33.2
Transfers out of Level 3	—			—			(0.4		)	—
Foreign exchange revaluation and other	(3.3		)	—			8.2			—
Balance at End of Period	$	208.1		$	(31.2	)	$	211.0		$	(60.4	)
Change in unrealized gains (losses) included in net income relating to assets and liabilities held at end of period	$	0.8		$	(1.6	)	$	4.4		$	(4.2	)



	2018						2017
(in millions)	Investments			Contingent Consideration Liability			Investments			Contingent Consideration Liabilities
for the six months ended March 31,	Investments			Contingent Consideration Liability			Investments			Contingent Consideration Liabilities
Balance at beginning of period	$	199.9		$	(51.0	)	$	205.1		$	(98.1	)
Acquisition	—			—			—			(5.7		)
Total realized and unrealized gains (losses)
Included in investment and other income, net	3.0			—			5.6			—
Included in general, administrative and other expense	—			(5.6		)	—			8.0
Purchases	6.7			—			0.8			—
Sales	—			—			(2.4		)	—
Settlements	(1.9		)	32.4			(2.5		)	35.4
Transfers out of Level 3	—			—			(0.4		)	—
Foreign exchange revaluation and other	0.4			(7.0		)	4.8			—
Balance at End of Period	$	208.1		$	(31.2	)	$	211.0		$	(60.4	)
Change in unrealized gains (losses) included in net income relating to assets and liabilities held at end of period	$	2.0		$	(5.6	)	$	4.2		$	8.0

Schedule of valuation techniques and significant unobservable inputs used in level 3 fair value measurements

Valuation techniques and significant unobservable inputs used in the Level 3 fair value measurements were as follows:



(in millions)
as of March 31, 2018	Fair Value		Valuation Technique	Significant Unobservable Inputs	Range (Weighted Average)
Investment securities, trading – debt and other equity securities	$	178.7	Market pricing	Redemption price	$73 per $100 of par
				Discount rate	18.1%
	16.9		Discounted cash flow	Discount rate	3.0%–6.7% (5.3%)
				Risk premium	2.0%–4.7% (3.2%)

Life settlement contracts	12.2		Discounted cash flow	Life expectancy	21–119 months (62)
				Discount rate	8.0%–20.0% (13.0%)

Contingent consideration liability	31.2		Discounted cash flow	AUM growth rate	(4.0%)
				Discount rate	14.9%



(in millions)
as of September 30, 2017	Fair Value		Valuation Technique	Significant Unobservable Inputs	Range (Weighted Average)
Investment securities, trading – debt and other equity securities	$	175.7	Market pricing	Redemption price	$73 per $100 of par
				Discount rate	18.6%
	11.1		Discounted cash flow	Discount rate	4.1%–6.7% (5.7%)
				Risk premium	2.0%–4.1% (2.9%)

Life settlement contracts	12.8		Discounted cash flow	Life expectancy	20–123 months (62)
				Discount rate	8.0%–20.0% (13.2%)

Contingent consideration liability	51.0		Discounted cash flow	AUM growth rate	1.3%–9.4% (5.3%)
				Discount rate	14.6%

Schedule of financial instruments not measured at fair value

Financial instruments that were not measured at fair value were as follows:



(in millions)	Fair Value Level	March 31, 2018				September 30, 2017
(in millions)	Fair Value Level	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Financial Assets
Cash and cash equivalents	1	$	8,545.4	$	8,545.4	$	8,523.3	$	8,523.3
Other investments
Time deposits	2	30.9		30.9		13.4		13.4
Cost method investments	3	55.6		78.6		46.7		67.7

Financial Liability
Debt	2	$	1,044.8	$	1,044.0	$	1,044.2	$	1,073.5

Consolidated Investment Products (Tables)

6 Months Ended

Mar. 31, 2018

Consolidated Investment Products [Abstract]

Schedule of balances of CIPs

The balances related to CIPs included in the Company’s consolidated balance sheets were as follows:



(in millions)	March 31, 2018		September 30, 2017
Assets
Cash and cash equivalents	$	181.1	$	226.4
Receivables	133.6		234.1
Investments, at fair value	3,529.3		3,467.4
Other assets	1.0		0.9
Total Assets	$	3,845.0	$	3,928.8

Liabilities
Accounts payable and accrued expenses	$	67.9	$	124.1
Debt	34.0		53.4
Other liabilities	11.9		8.7
Total liabilities	113.8		186.2
Redeemable Noncontrolling Interests	2,084.4		1,941.9
Stockholders’ Equity
Franklin Resources, Inc.’s interests	1,330.0		1,511.8
Nonredeemable noncontrolling interests	316.8		288.9
Total stockholders’ equity	1,646.8		1,800.7
Total Liabilities, Redeemable Noncontrolling Interests and Stockholders’ Equity	$	3,845.0	$	3,928.8

Schedule of investments of CIPs

Investments of CIPs consisted of the following:



(in millions)	March 31, 2018		September 30, 2017
Investment securities, trading	$	3,063.7	$	3,017.2
Other equity securities	353.9		306.9
Other debt securities	111.7		143.3
Total	$	3,529.3	$	3,467.4

Schedule of assets and liabilities measured at fair value on a recurring basis

Assets and liabilities of CIPs measured at fair value on a recurring basis were as follows:



(in millions)	Level 1		Level 2		Level 3		NAV as a Practical Expedient		Total
as of March 31, 2018	Level 1		Level 2		Level 3		NAV as a Practical Expedient		Total
Assets
Investments
Equity securities	$	312.7	$	266.6	$	188.4	$	167.1	$	934.8
Debt securities	1.3		2,481.0		112.2		—		2,594.5
Total Assets Measured at Fair Value	$	314.0	$	2,747.6	$	300.6	$	167.1	$	3,529.3

Liabilities
Other liabilities	$	0.6	$	11.3	$	—	$	—	$	11.9



(in millions)	Level 1		Level 2		Level 3		NAV as a Practical Expedient		Total
as of September 30, 2017	Level 1		Level 2		Level 3		NAV as a Practical Expedient		Total
Assets
Investments
Equity securities	$	331.4	$	128.1	$	160.7	$	155.2	$	775.4
Debt securities	1.4		2,555.2		135.4		—		2,692.0
Total Assets Measured at Fair Value	$	332.8	$	2,683.3	$	296.1	$	155.2	$	3,467.4

Liabilities
Other liabilities	$	0.4	$	8.3	$	—	$	—	$	8.7

Schedule of changes in Level 3 assets of CIPs

Changes in Level 3 assets were as follows:



	2018								2017
(in millions)	Equity Securities		Debt Securities			Total Level 3 Assets			Equity Securities		Debt Securities			Total Level 3 Assets
for the three months ended March 31,	Equity Securities		Debt Securities			Total Level 3 Assets			Equity Securities		Debt Securities			Total Level 3 Assets
Balance at beginning of period	$	159.6	$	136.2		$	295.8		$	131.6	$	124.4		$	256.0
Realized and unrealized gains (losses) included in investment and other income, net	15.6		2.0			17.6			4.2		(14.2		)	(10.0		)
Purchases	11.5		10.5			22.0			4.5		5.6			10.1
Sales	—		(37.7		)	(37.7		)	—		(1.9		)	(1.9		)
Foreign exchange revaluation	1.7		1.2			2.9			0.4		0.5			0.9
Balance at End of Period	$	188.4	$	112.2		$	300.6		$	140.7	$	114.4		$	255.1
Change in unrealized gains (losses) included in net income relating to assets held at end of period	$	15.4	$	—		$	15.4		$	4.2	$	(14.3	)	$	(10.1	)



	2018									2017
(in millions)	Equity Securities			Debt Securities			Total Level 3 Assets			Equity Securities			Debt Securities			Total Level 3 Assets
for the six months ended March 31,	Equity Securities			Debt Securities			Total Level 3 Assets			Equity Securities			Debt Securities			Total Level 3 Assets
Balance at beginning of period	$	160.7		$	135.4		$	296.1		$	160.3		$	132.3		$	292.6
Adoption of new accounting guidance	—			—			—			(45.4		)	(0.5		)	(45.9		)
Realized and unrealized gains (losses) included in investment and other income, net	17.5			2.1			19.6			0.9			(14.5		)	(13.6		)
Purchases	22.6			10.5			33.1			25.5			7.8			33.3
Sales	(14.9		)	(37.7		)	(52.6		)	(0.1		)	(8.3		)	(8.4		)
Foreign exchange revaluation	2.5			1.9			4.4			(0.5		)	(2.4		)	(2.9		)
Balance at End of Period	$	188.4		$	112.2		$	300.6		$	140.7		$	114.4		$	255.1
Change in unrealized gains (losses) included in net income relating to assets held at end of period	$	16.3		$	0.1		$	16.4		$	0.8		$	(15.0	)	$	(14.2	)

Schedule of valuation techniques and significant unobservable inputs used in Level 3 fair value measurements

Valuation techniques and significant unobservable inputs used in Level 3 fair value measurements were as follows:



(in millions)
as of March 31, 2018	Fair Value		Valuation Technique	Significant Unobservable Inputs	Range (Weighted Average)
Equity securities	$	160.9	Market comparable companies	EBITDA multiple	5.0–13.6 (9.1)
Equity securities	27.5		Discounted cash flow	Discount rate	5.7%–16.5% (13.5%)

Debt securities	77.8		Discounted cash flow	Discount rate	5.7%–14.6% (10.0%)
	31.1		Comparable trading multiple	Price to earnings ratio	10.0
	31.1		Comparable trading multiple	Enterprise value/ EBITDA multiple	20.9
	3.3		Market pricing	Private sale pricing	$33 per $100 of par



(in millions)
as of September 30, 2017	Fair Value		Valuation Technique	Significant Unobservable Inputs	Range (Weighted Average)
Equity securities	$	101.9	Market comparable companies	EBITDA multiple	5.5–12.3 (9.0)
	44.4		Discounted cash flow	Discount rate	5.7%–17.9% (14.3%)
	14.4		Market pricing	Price to earnings ratio	10.0

Debt securities	112.7		Discounted cash flow	Discount rate	5.0%–33.0% (9.5%)
	112.7		Discounted cash flow	Risk premium	0.0%–25.0% (8.4%)
	22.7		Market pricing	Private sale pricing	$33–$57 ($52) per $100 of par

Schedule of financial instruments of CIPs not measured at fair value

Financial instruments of CIPs that were not measured at fair value were as follows:



(in millions)	Fair Value Level	March 31, 2018				September 30, 2017
(in millions)	Fair Value Level	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Financial Asset
Cash and cash equivalents	1	$	181.1	$	181.1	$	226.4	$	226.4
Financial Liability
Debt	3	$	34.0	$	33.7	$	53.4	$	53.1

Schedule of changes in redeemable noncontrolling interests of CIPs

Changes in redeemable noncontrolling interests of CIPs were as follows:



(in millions)
for the six months ended March 31,	2018		2017
Balance at beginning of period	$	1,941.9	$	61.1
Adoption of new accounting guidance	—		824.7
Net income (loss)	26.7		(3.2		)
Net subscriptions and other	115.8		349.2
Net consolidations	—		428.0
Balance at End of Period	$	2,084.4	$	1,659.8

Nonconsolidated Variable Interest Entities (Tables)

6 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of maximum exposure loss from nonconsolidated VIEs

The Company’s maximum exposure to loss from these VIEs consists of investment management fee receivables and equity investments as follows:



(in millions)	March 31, 2018		September 30, 2017
Receivables	$	156.7	$	155.6
Investments	72.4		129.3
Total	$	229.1	$	284.9

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

Taxes on Income (Tables)

6 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Components of deferred tax assets and liabilities

Deferred tax assets and deferred tax liabilities were as follows:



(in millions)	March 31, 2018		September 30, 2017
Deferred tax assets, net of valuation allowance	$	95.2	$	141.3
Deferred tax liabilities	204.2		296.1
Net Deferred Tax Liability	$	109.0	$	154.8

Components of net deferred tax assets or liabilities as classified in the consolidated balance sheets

The components of the net deferred tax liability were classified in the consolidated balance sheets as follows:



(in millions)	March 31, 2018		September 30, 2017
Other assets	$	20.9	$	15.8
Deferred tax liabilities	129.9		170.6
Net Deferred Tax Liability	$	109.0	$	154.8

Taxes on income and the related impact on the effective income tax rate

Taxes on income and the related impacts on the effective income tax rate were as follows:



(in millions)	Three Months Ended March 31, 2018					Six Months Ended March 31, 2018
(in millions)	Amount			Percentage of Income Before Taxes		Amount			Percentage of Income Before Taxes
Tax expense before one-time charges	$	151.0		23.9	%	$	305.6		23.8	%
Transition tax on deemed repatriation of undistributed foreign earnings	(0.5		)	(0.1	%)	1,120.2			87.2	%
Revaluation of net deferred tax liabilities	(0.5		)	(0.1	%)	(53.6		)	(4.2	%)
Other Tax Act impacts	0.2			0.0	%	1.5			0.1	%
Total	$	150.2		23.7	%	$	1,373.7		106.9	%

Stock-Based Compensation (Tables)

6 Months Ended

Mar. 31, 2018

Share-based Compensation [Abstract]

Summary of nonvested stock and stock unit award activity

Stock and stock unit award activity was as follows:



(shares in thousands)	Time-Based Shares		Performance- Based Shares		Total Shares		Weighted-Average Grant-Date Fair Value
for the six months ended March 31, 2018	Time-Based Shares		Performance- Based Shares		Total Shares		Weighted-Average Grant-Date Fair Value
Nonvested balance at October 1, 2017	2,783		1,761		4,544		$	37.23
Granted	2,243		714		2,957		42.76
Vested	(140	)	(512	)	(652	)	39.22
Forfeited/canceled	(146	)	(138	)	(284	)	45.99
Nonvested Balance at March 31, 2018	4,740		1,825		6,565		$	39.14

Other Income (Expenses) (Tables)

6 Months Ended

Mar. 31, 2018

Other Income and Expenses [Abstract]

Schedule of other income (expenses)

Other income (expenses) consisted of the following:



	Three Months Ended March 31,						Six Months Ended March 31,
(in millions)	2018			2017			2018			2017
Investment and Other Income, Net
Interest income	$	25.7		$	16.0		$	49.5		$	29.6
Dividend income	8.7			2.7			13.4			5.1
Gains on trading investment securities, net	1.8			8.4			2.5			10.4
Realized gains on sale of investment securities, available-for-sale	2.1			2.3			2.1			2.9
Realized losses on sale of investment securities, available-for-sale	(0.4		)	(0.5		)	(0.4		)	(1.2		)
Income from investments in equity method investees	10.7			36.3			45.9			70.5
Other-than-temporary impairment of investments	(0.1		)	—			(0.6		)	(0.3		)
Gains (losses) on investments of CIPs, net	38.6			22.7			54.6			(7.2		)
Foreign currency exchange gains (losses), net	(7.8		)	(6.2		)	(10.7		)	13.6
Other, net	8.1			2.9			12.4			7.3
Total	87.4			84.6			168.7			130.7
Interest Expense	(10.0		)	(12.6		)	(20.8		)	(25.9		)
Other Income, Net	$	77.4		$	72.0		$	147.9		$	104.8

Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Changes in accumulated other comprehensive income (loss) by component

Changes in accumulated other comprehensive income (loss) by component were as follows:



(in millions)	Unrealized Gains on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
for the three months ended March 31, 2018	Unrealized Gains on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
Balance at January 1, 2018	$	5.7		$	(265.2	)	$	(7.1	)	$	(266.6	)
Adoption of new accounting guidance	—			—			(0.1		)	(0.1		)
Other comprehensive income (loss)
Other comprehensive income before reclassifications, net of tax	1.5			8.3			0.4			10.2
Reclassifications to net investment and other income, net of tax	(1.7		)	(1.5		)	—			(3.2		)
Total other comprehensive income (loss)	(0.2		)	6.8			0.4			7.0
Balance at March 31, 2018	$	5.5		$	(258.4	)	$	(6.8	)	$	(259.7	)



(in millions)	Unrealized Gains on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
for the six months ended March 31, 2018	Unrealized Gains on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
Balance at October 1, 2017	$	2.2		$	(281.0	)	$	(6.0	)	$	(284.8	)
Adoption of new accounting guidance	—			—			(0.1		)	(0.1		)
Other comprehensive income (loss)
Other comprehensive income (loss) before reclassifications, net of tax	5.0			24.1			(0.7		)	28.4
Reclassifications to net investment and other income, net of tax	(1.7		)	(1.5		)	—			(3.2		)
Total other comprehensive income (loss)	3.3			22.6			(0.7		)	25.2
Balance at March 31, 2018	$	5.5		$	(258.4	)	$	(6.8	)	$	(259.7	)



(in millions)	Unrealized Gains (Losses) on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
for the three months ended March 31, 2017	Unrealized Gains (Losses) on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
Balance at January 1, 2017	$	(2.4	)	$	(407.3	)	$	(8.1	)	$	(417.8	)
Other comprehensive income
Other comprehensive income before reclassifications, net of tax	6.6			39.2			—			45.8
Reclassifications to net investment and other income, net of tax	(1.2		)	—			—			(1.2		)
Total other comprehensive income	5.4			39.2			—			44.6
Balance at March 31, 2017	$	3.0		$	(368.1	)	$	(8.1	)	$	(373.2	)



(in millions)	Unrealized Gains on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
for the six months ended March 31, 2017	Unrealized Gains on Investments			Currency Translation Adjustments			Unrealized Losses on Defined Benefit Plans			Total
Balance at October 1, 2016	$	6.8		$	(346.1	)	$	(8.1	)	$	(347.4	)
Adoption of new accounting guidance	(6.8		)	(0.3		)	—			(7.1		)
Other comprehensive income (loss)
Other comprehensive income (loss) before reclassifications, net of tax	4.0			(21.7		)	—			(17.7		)
Reclassifications to net investment and other income, net of tax	(1.0		)	—			—			(1.0		)
Total other comprehensive income (loss)	3.0			(21.7		)	—			(18.7		)
Balance at March 31, 2017	$	3.0		$	(368.1	)	$	(8.1	)	$	(373.2	)

Stockholders' Equity - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Apr. 11, 2018
Stockholders' Equity Note [Abstract]
Number of shares repurchased during period	11.1	4.0	15.7	11.1
Cost of shares repurchased during period	$ 432.6	$ 166.8	$ 632.6	$ 428.5
Remaining number of shares authorized to be repurchased	15.9		15.9
Subsequent Event [Member]
Subsequent Event [Line Items]
Additional number of shares authorized to be repurchased					80.0

Stockholders' Equity - Changes in Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Oct. 01, 2017	Oct. 01, 2016
Stockholders' Equity Rollforward
Beginning balance - Franklin Resources, Inc. Stockholders' Equity			$ 12,620.0
Beginning balance - Nonredeemable Noncontrolling Interests			315.8
Beginning balance - Total Stockholders' Equity			12,935.8	$ 12,528.2
Net income (loss) attributable to Franklin Resources, Inc.	$ 443.2	$ 420.7	(140.1)	860.9
Nonredeemable noncontrolling interests	24.5	(6.0)	24.4	(3.9)
Net income (loss)			(115.7)	857.0
Other comprehensive income (loss)	7.0	44.6	25.2	(18.7)
Cash dividends declared on common stock			(1,889.4)	(226.3)
Repurchase of common stock	(432.6)	(166.8)	(632.6)	(428.5)
Stock-based compensation			74.9	71.7
Net subscriptions and other			5.7	15.7
Deconsolidation of investment products			(2.1)
Ending balance - Franklin Resources, Inc. Stockholders' Equity	10,058.4		10,058.4
Ending balance - Nonredeemable Noncontrolling Interests	343.8		343.8
Ending balance - Total Stockholders' Equity	10,402.2	12,473.2	10,402.2	12,473.2
Franklin Resources, Inc. Stockholders' Equity [Member]
Stockholders' Equity Rollforward
Beginning balance - Franklin Resources, Inc. Stockholders' Equity			12,620.0	11,935.8
Net income (loss) attributable to Franklin Resources, Inc.			(140.1)	860.9
Other comprehensive income (loss)			25.2	(18.7)
Cash dividends declared on common stock			(1,889.4)	(226.3)
Repurchase of common stock			(632.6)	(428.5)
Stock-based compensation			74.9	71.7
Ending balance - Franklin Resources, Inc. Stockholders' Equity	10,058.4	12,193.6	10,058.4	12,193.6
Nonredeemable Noncontrolling Interests [Member]
Stockholders' Equity Rollforward
Beginning balance - Nonredeemable Noncontrolling Interests			315.8	592.4
Nonredeemable noncontrolling interests			24.4	(3.9)
Net subscriptions and other			5.7	15.7
Deconsolidation of investment products			(2.1)
Ending balance - Nonredeemable Noncontrolling Interests	$ 343.8	$ 279.6	$ 343.8	$ 279.6
ASU 2016-09 [Member]
Stockholders' Equity Rollforward
Adoption of new accounting guidance					$ 0.4
ASU 2016-09 [Member] \| Franklin Resources, Inc. Stockholders' Equity [Member]
Stockholders' Equity Rollforward
Adoption of new accounting guidance					0.4
ASU 2016-09 [Member] \| Nonredeemable Noncontrolling Interests [Member]
Stockholders' Equity Rollforward
Adoption of new accounting guidance					$ 0.0
ASU 2015-02 [Member]
Stockholders' Equity Rollforward
Adoption of new accounting guidance						$ (325.9)
ASU 2015-02 [Member] \| Franklin Resources, Inc. Stockholders' Equity [Member]
Stockholders' Equity Rollforward
Adoption of new accounting guidance						(1.3)
ASU 2015-02 [Member] \| Nonredeemable Noncontrolling Interests [Member]
Stockholders' Equity Rollforward
Adoption of new accounting guidance						$ (324.6)

Earnings (Loss) per Share - Narrative (Details) - shares shares in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Shares of nonparticipating nonvested stock unit awards excluded from the calculation of diluted EPS	0.2	1.9	0.7

Earnings (Loss) per Share - Components of Basic and Diluted Earnings (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share Reconciliation [Abstract]
Net income (loss) attributable to Franklin Resources, Inc.	$ 443.2	$ 420.7	$ (140.1)	$ 860.9
Less: allocation of earnings to participating nonvested stock and stock unit awards - basic	15.2	3.5	16.3	6.4
Less: allocation of earnings to participating nonvested stock and stock unit awards - diluted	15.2	3.5	16.3	6.4
Net Income (Loss) Available to Common Stockholders - basic	428.0	417.2	(156.4)	854.5
Net Income (Loss) Available to Common Stockholders - diluted	$ 428.0	$ 417.2	$ (156.4)	$ 854.5
Weighted-average shares outstanding – basic	545.0	560.3	547.9	562.7
Dilutive effect of nonparticipating nonvested stock unit awards	0.5	0.3	0.0	0.2
Weighted-Average Shares Outstanding – Diluted	545.5	560.6	547.9	562.9
Earnings (Loss) per Share [Abstract]
Basic	$ 0.79	$ 0.74	$ (0.29)	$ 1.52
Diluted	$ 0.78	$ 0.74	$ (0.29)	$ 1.52

Investments - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Investments - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2017
Investments [Abstract]
Aggregate carrying amounts of investment securities pledged as collateral	$ 1.2		$ 1.2		$ 0.8
Other-than-temporary impairment of investments	$ 0.1	$ 0.0	$ 0.6	$ 0.3

Investments - Summary of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Investment Holdings [Line Items]
Investment securities, trading	$ 349.6	$ 314.5
Investment securities, available-for-sale	87.7	112.7
Investments in equity method investees	1,043.0	893.5
Other investments	98.7	72.9
Total	1,579.0	1,393.6
Sponsored Funds [Member]
Investment Holdings [Line Items]
Investment securities, trading	78.6	31.1
Investment securities, available-for-sale	86.0	110.8
Debt and Other Equity Securities [Member]
Investment Holdings [Line Items]
Investment securities, trading	271.0	283.4
Investment securities, available-for-sale	$ 1.7	$ 1.9

Investments - Summary of Gross Unrealized Gains and Losses Relating to Investment Securities, Available-for-Sale (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Investment Holdings [Line Items]
Cost Basis	$ 82.0	$ 109.8
Gross Unrealized Gains	11.2	9.4
Gross Unrealized Losses	(5.5)	(6.5)
Fair Value	87.7	112.7
Sponsored Funds [Member]
Investment Holdings [Line Items]
Cost Basis	80.4	107.9
Gross Unrealized Gains	11.1	9.4
Gross Unrealized Losses	(5.5)	(6.5)
Fair Value	86.0	110.8
Debt and Other Equity Securities [Member]
Investment Holdings [Line Items]
Cost Basis	1.6	1.9
Gross Unrealized Gains	0.1	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	$ 1.7	$ 1.9

Investments - Summary of Gross Unrealized Losses, AFS, Continuous Loss Position (Details) - Sponsored Funds [Member] - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 27.3	$ 28.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Gross Unrealized Losses	(5.5)	(6.3)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Greater, Fair Value	0.0	2.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Greater, Gross Unrealized Losses	0.0	(0.2)
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Fair Value	27.3	30.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Total Gross Unrealized Losses	$ (5.5)	$ (6.5)

Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Transfers into Level 1 from Level 2 - assets	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Transfers into Level 2 from Level 1 - assets	0.5	0.0	0.5	0.0
Transfers into Level 1 from Level 2 - liabilities	0.0	0.0	0.0	0.0
Transfers into Level 2 from Level 1 - liabilities	0.0	0.0	0.0	0.0
Transfers into Level 3 - assets	0.0	0.0	0.0	0.0
Transfers into Level 3 - liabilities	0.0	0.0	0.0	0.0
Transfers out of Level 3 - assets	0.0	0.0	0.0	0.0
Transfers out of Level 3 - liabilities	$ 0.0	$ 0.0	$ 0.0	$ 0.0

Fair Value Measurements - Schedule of Assets and Liability Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Assets [Abstract]
Investment securities, trading	$ 349.6	$ 314.5
Investment securities, available-for-sale	87.7	112.7
Life settlement contracts	12.2	12.8
Total Assets Measured at Fair Value	449.5	440.0
Liability [Abstract]
Contingent consideration liability	31.2	51.0
Level 1 [Member]
Assets [Abstract]
Life settlement contracts	0.0	0.0
Total Assets Measured at Fair Value	185.5	161.1
Liability [Abstract]
Contingent consideration liability	0.0	0.0
Level 2 [Member]
Assets [Abstract]
Life settlement contracts	0.0	0.0
Total Assets Measured at Fair Value	55.9	79.0
Liability [Abstract]
Contingent consideration liability	0.0	0.0
Level 3 [Member]
Assets [Abstract]
Life settlement contracts	12.2	12.8
Total Assets Measured at Fair Value	208.1	199.9
Liability [Abstract]
Contingent consideration liability	31.2	51.0
Sponsored Funds [Member]
Assets [Abstract]
Investment securities, trading	78.6	31.1
Investment securities, available-for-sale	86.0	110.8
Sponsored Funds [Member] \| Level 1 [Member]
Assets [Abstract]
Investment securities, trading	78.6	31.1
Investment securities, available-for-sale	86.0	110.8
Sponsored Funds [Member] \| Level 2 [Member]
Assets [Abstract]
Investment securities, trading	0.0	0.0
Investment securities, available-for-sale	0.0	0.0
Sponsored Funds [Member] \| Level 3 [Member]
Assets [Abstract]
Investment securities, trading	0.0	0.0
Investment securities, available-for-sale	0.0	0.0
Debt and Other Equity Securities [Member]
Assets [Abstract]
Investment securities, trading	271.0	283.4
Investment securities, available-for-sale	1.7	1.9
Debt and Other Equity Securities [Member] \| Level 1 [Member]
Assets [Abstract]
Investment securities, trading	20.0	18.2
Investment securities, available-for-sale	0.9	1.0
Debt and Other Equity Securities [Member] \| Level 2 [Member]
Assets [Abstract]
Investment securities, trading	55.4	78.4
Investment securities, available-for-sale	0.5	0.6
Debt and Other Equity Securities [Member] \| Level 3 [Member]
Assets [Abstract]
Investment securities, trading	195.6	186.8
Investment securities, available-for-sale	$ 0.3	$ 0.3

Fair Value Measurements - Schedule of Changes in Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Transfers out of Level 3 - assets	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Transfers out of Level 3 - liabilities	0.0	0.0	0.0	0.0
Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period - assets	295.8	256.0	296.1	292.6
Total realized and unrealized gains (losses) - assets	17.6	(10.0)	19.6	(13.6)
Purchases - assets	22.0	10.1	33.1	33.3
Sales - assets	(37.7)	(1.9)	(52.6)	(8.4)
Balance at End of Period - assets	300.6	255.1	300.6	255.1
Change in unrealized gains (losses) included in net income relating to assets and liability held at end of period	15.4	(10.1)	16.4	(14.2)
Level 3 [Member] \| Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period - assets	210.1	198.7	199.9	205.1
Acquisition - assets	0.0	0.0	0.0	0.0
Purchases - assets	1.4	0.3	6.7	0.8
Sales - assets			0.0	(2.4)
Settlements - assets	(1.9)	(0.8)	(1.9)	(2.5)
Transfers out of Level 3 - assets	0.0	(0.4)	0.0	0.4
Foreign exchange revaluation and other	(3.3)	8.2	0.4	4.8
Balance at End of Period - assets	208.1	211.0	208.1	211.0
Change in unrealized gains (losses) included in net income relating to assets and liability held at end of period	0.8	4.4	2.0	4.2
Level 3 [Member] \| Contingent Consideration Liability [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period - liabilities	(62.0)	(83.7)	(51.0)	(98.1)
Acquisition - liabilities	0.0	5.7	0.0	5.7
Purchases - liability	0.0	0.0	0.0	0.0
Sales - liability			0.0	0.0
Settlements - liability	32.4	33.2	32.4	35.4
Transfers out of Level 3 - liabilities	0.0	0.0	0.0	0.0
Foreign exchange revaluation and other	0.0	0.0	(7.0)	0.0
Balance at End of Period - liabilities	(31.2)	(60.4)	(31.2)	(60.4)
Change in unrealized gains (losses) included in net income relating to assets and liability held at end of period	(1.6)	(4.2)	(5.6)	8.0
Level 3 [Member] \| Investment and other income [Member] \| Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses) - assets	1.8	5.0	3.0	5.6
Level 3 [Member] \| Investment and other income [Member] \| Contingent Consideration Liability [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses) - liability	0.0	0.0	0.0	0.0
Level 3 [Member] \| General, administrative and other expense [Member] \| Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses) - assets	0.0	0.0	0.0	0.0
Level 3 [Member] \| General, administrative and other expense [Member] \| Contingent Consideration Liability [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total realized and unrealized gains (losses) - liability	$ (1.6)	$ (4.2)	$ (5.6)	$ 8.0

Fair Value Measurements - Schedule of Valuation Techniques and Significant Unobservable Inputs used in Level 3 Fair Value Measurements (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Investment securities, trading	$ 349.6	$ 314.5
Life settlement contracts	12.2	12.8
Contingent consideration liability	31.2	51.0
Level 3 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Life settlement contracts	12.2	12.8
Contingent consideration liability	31.2	51.0
Discounted cash flow [Member] \| Level 3 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Life settlement contracts	12.2	12.8
Contingent consideration liability	$ 31.2	$ 51.0
Contingent Consideration Liability [Member] \| Minimum [Member] \| Discounted cash flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
AUM growth rate		1.30%
Contingent Consideration Liability [Member] \| Maximum [Member] \| Discounted cash flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
AUM growth rate		9.40%
Contingent Consideration Liability [Member] \| Weighted Average [Member] \| Discounted cash flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	14.90%	14.60%
AUM growth rate	(4.00%)	5.30%
Life Settlement Contracts [Member] \| Minimum [Member] \| Discounted cash flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	8.00%	8.00%
Life expectancy	21 months	20 months
Life Settlement Contracts [Member] \| Maximum [Member] \| Discounted cash flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	20.00%	20.00%
Life expectancy	119 months	123 months
Life Settlement Contracts [Member] \| Weighted Average [Member] \| Discounted cash flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	13.00%	13.20%
Life expectancy	62 months	62 months
Debt and Other Equity Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Investment securities, trading	$ 271.0	$ 283.4
Debt and Other Equity Securities [Member] \| Level 3 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Investment securities, trading	195.6	186.8
Debt and Other Equity Securities [Member] \| Discounted cash flow [Member] \| Level 3 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Investment securities, trading	16.9	11.1
Debt and Other Equity Securities [Member] \| Market Pricing [Member] \| Level 3 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Investment securities, trading	$ 178.7	$ 175.7
Debt and Other Equity Securities [Member] \| Minimum [Member] \| Discounted cash flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	3.00%	4.10%
Risk premium	2.00%	2.00%
Debt and Other Equity Securities [Member] \| Maximum [Member] \| Discounted cash flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	6.70%	6.70%
Risk premium	4.70%	4.10%
Debt and Other Equity Securities [Member] \| Weighted Average [Member] \| Discounted cash flow [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	5.30%	5.70%
Risk premium	3.20%	2.90%
Debt and Other Equity Securities [Member] \| Weighted Average [Member] \| Market Pricing [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Redemption price	$ 0.73	$ 0.73
Discount rate	18.10%	18.60%

Fair Value Measurements - Schedule of Financial Instruments not Measured at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016
Assets [Abstract]
Cash and cash equivalents	$ 8,726.5	$ 8,749.7	$ 8,776.1	$ 8,483.3
Carrying Value [Member]
Assets [Abstract]
Cash and cash equivalents	8,545.4	8,523.3
Time deposits	30.9	13.4
Cost method investments	55.6	46.7
Financial Liabilities [Abstract]
Debt	1,044.8	1,044.2
Estimated Fair Value [Member] \| Level 1 [Member]
Assets [Abstract]
Cash and cash equivalents	8,545.4	8,523.3
Estimated Fair Value [Member] \| Level 2 [Member]
Assets [Abstract]
Time deposits	30.9	13.4
Financial Liabilities [Abstract]
Debt	1,044.0	1,073.5
Estimated Fair Value [Member] \| Level 3 [Member]
Assets [Abstract]
Cost method investments	$ 78.6	$ 67.7

Consolidated Investment Products - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)
Consolidated Investment Products [Abstract]
Number of consolidated investment products	54		54		58
Schedule Of Consolidated Investment Products [Line Items]
Transfers into Level 2 from Level 1 - assets	$ 0.5	$ 0.0	$ 0.5	$ 0.0
Transfers into Level 2 from Level 1 - liabilities	0.0	0.0	0.0	0.0
Transfers into Level 1 from Level 2 - assets	0.0	0.0	0.0	0.0
Transfers into Level 1 from Level 2 - liabilities	0.0	0.0	0.0	0.0
Transfers into Level 3 - assets	0.0	0.0	0.0	0.0
Transfers out of Level 3 - assets	0.0	0.0	0.0	0.0
Transfers into Level 3 - liabilities	0.0	0.0	0.0	0.0
Transfers out of Level 3 - liabilities	0.0	0.0	0.0	0.0
Debt	1,044.8		1,044.8		$ 1,044.2
CIPs [Member]
Schedule Of Consolidated Investment Products [Line Items]
Transfers into Level 2 from Level 1 - assets	3.5	0.0	3.5	0.0
Transfers into Level 2 from Level 1 - liabilities	0.0	0.0	0.0	0.0
Transfers into Level 1 from Level 2 - assets	0.0	0.0	0.0	0.0
Transfers into Level 1 from Level 2 - liabilities	0.0	0.0	0.0	0.0
Transfers into Level 3 - assets	0.0	0.0	0.0	0.0
Transfers out of Level 3 - assets	0.0	0.0	0.0	0.0
Transfers into Level 3 - liabilities	0.0	0.0	0.0	0.0
Transfers out of Level 3 - liabilities	0.0	$ 0.0	$ 0.0	$ 0.0
Number of countries impacted by price changes			11
CIPs' unfunded commitments	1.9		$ 1.9		1.9
Unfunded commitments Company contractually obligated to fund	0.4		0.4		0.4
Debt	$ 34.0		$ 34.0		$ 53.4
Effective Interest Rate	6.25%		6.25%		5.15%
CIPs [Member] \| Real Estate and Private Equity Funds [Member]
Schedule Of Consolidated Investment Products [Line Items]
Liquidation weighted average period			4 years		4 years 5 months
CIPs [Member] \| Minimum [Member]
Schedule Of Consolidated Investment Products [Line Items]
Stated interest rate	3.07%		3.07%		2.84%
CIPs [Member] \| Maximum [Member]
Schedule Of Consolidated Investment Products [Line Items]
Stated interest rate	7.13%		7.13%		6.75%

Consolidated Investment Products - Schedule of Balances of CIPs (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016
Assets [Abstract]
Cash and cash equivalents	$ 8,726.5	$ 8,749.7	$ 8,776.1	$ 8,483.3
Receivables	765.4	767.8
Investments, at fair value	449.5	440.0
Other assets	196.2	176.5
Total Assets	17,690.0	17,534.0
Liabilities [Abstract]
Accounts payable and accrued expenses	194.6	167.4
Debt	1,044.8	1,044.2
Other liabilities	187.8	198.7
Total liabilities	5,203.4	2,656.3
Redeemable Noncontrolling Interests	2,084.4	1,941.9	1,659.8	61.1
Stockholders' Equity [Abstract]
Franklin Resources, Inc.’s interests	10,058.4	12,620.0
Nonredeemable noncontrolling interests	343.8	315.8
Total stockholders’ equity	10,402.2	12,935.8	$ 12,473.2	$ 12,528.2
Total Liabilities, Redeemable Noncontrolling Interests and Stockholders’ Equity	17,690.0	17,534.0
CIPs [Member]
Assets [Abstract]
Cash and cash equivalents	181.1	226.4
Receivables	133.6	234.1
Investments, at fair value	3,529.3	3,467.4
Other assets	1.0	0.9
Total Assets	3,845.0	3,928.8
Liabilities [Abstract]
Accounts payable and accrued expenses	67.9	124.1
Debt	34.0	53.4
Other liabilities	11.9	8.7
Total liabilities	113.8	186.2
Redeemable Noncontrolling Interests	2,084.4	1,941.9
Stockholders' Equity [Abstract]
Franklin Resources, Inc.’s interests	1,330.0	1,511.8
Nonredeemable noncontrolling interests	316.8	288.9
Total stockholders’ equity	1,646.8	1,800.7
Total Liabilities, Redeemable Noncontrolling Interests and Stockholders’ Equity	$ 3,845.0	$ 3,928.8

Consolidated Investment Products - Schedule of Investments of CIPs (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Schedule Of Consolidated Investment Products [Line Items]
Investment securities, trading	$ 349.6	$ 314.5
Fair value	449.5	440.0
CIPs [Member]
Schedule Of Consolidated Investment Products [Line Items]
Investment securities, trading	3,063.7	3,017.2
Other equity securities	353.9	306.9
Other debt securities	111.7	143.3
Fair value	$ 3,529.3	$ 3,467.4

- Definition

[Line Items] for Tabular disclosure of qualitative and quantitative information related to investment products holds, whether or not such investment products (CIP) is included in the reporting entity's consolidated financial statements. Includes, but is not limited to, description of the significant judgments and assumptions made in determining whether a CIP (as defined) held by the entity requires the CIP (as defined) to be consolidated and (or) disclose information about its involvement with the CIP, individually or in aggregate (as applicable); the nature of restrictions, if any, on the CIP's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the CIP; how involvement with the CIP affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the CIP have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the SIP, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the consolidated investment products; the significant factors considered and judgments made in determining that the power to direct the activities of a CIP that most significantly impact the CIP's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the CIP included in the statement of financial position.

+ References + Details

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References + Details

Consolidated Investment Products - Schedule of Balances of Assets and Liabilities of CIPs Measured at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Assets [Abstract]
Total Assets Measured at Fair Value	$ 449.5	$ 440.0
Level 1 [Member]
Assets [Abstract]
Total Assets Measured at Fair Value	185.5	161.1
Level 2 [Member]
Assets [Abstract]
Total Assets Measured at Fair Value	55.9	79.0
Level 3 [Member]
Assets [Abstract]
Total Assets Measured at Fair Value	208.1	199.9
CIPs [Member]
Assets [Abstract]
Equity securities	353.9	306.9
Debt securities	111.7	143.3
Fair Value, Measurements, Recurring [Member] \| CIPs [Member]
Assets [Abstract]
Equity securities	934.8	775.4
Debt securities	2,594.5	2,692.0
Total Assets Measured at Fair Value	3,529.3	3,467.4
Liability [Abstract]
Other liabilities	11.9	8.7
NAV as a Practical Expedient	167.1	155.2
Fair Value, Measurements, Recurring [Member] \| CIPs [Member] \| Level 1 [Member]
Assets [Abstract]
Equity securities	312.7	331.4
Debt securities	1.3	1.4
Total Assets Measured at Fair Value	314.0	332.8
Liability [Abstract]
Other liabilities	0.6	0.4
Fair Value, Measurements, Recurring [Member] \| CIPs [Member] \| Level 2 [Member]
Assets [Abstract]
Equity securities	266.6	128.1
Debt securities	2,481.0	2,555.2
Total Assets Measured at Fair Value	2,747.6	2,683.3
Liability [Abstract]
Other liabilities	11.3	8.3
Fair Value, Measurements, Recurring [Member] \| CIPs [Member] \| Level 3 [Member]
Assets [Abstract]
Equity securities	188.4	160.7
Debt securities	112.2	135.4
Total Assets Measured at Fair Value	300.6	296.1
Liability [Abstract]
Other liabilities	0.0	0.0
Equity Securities [Member] \| Fair Value, Measurements, Recurring [Member] \| CIPs [Member]
Liability [Abstract]
NAV as a Practical Expedient	$ 167.1	$ 155.2

Consolidated Investment Products - Schedule of Changes in Level 3 Assets of CIPs (Details) - Level 3 [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Oct. 01, 2016
Schedule Of Consolidated Investment Products [Line Items]
Balance at beginning of period - assets	$ 295.8	$ 256.0	$ 296.1	$ 292.6
Realized and unrealized gains (losses) included in investment and other income, net - assets	17.6	(10.0)	19.6	(13.6)
Purchases - assets	22.0	10.1	33.1	33.3
Sales - assets	(37.7)	(1.9)	(52.6)	(8.4)
Foreign exchange revaluation	2.9	0.9	4.4	(2.9)
Balance at End of Period - assets	300.6	255.1	300.6	255.1
Change in unrealized gains (losses) included in net income relating to assets held at end of period	15.4	(10.1)	16.4	(14.2)
Equity Securities [Member]
Schedule Of Consolidated Investment Products [Line Items]
Balance at beginning of period - assets	159.6	131.6	160.7	160.3
Realized and unrealized gains (losses) included in investment and other income, net - assets	15.6	4.2	17.5	0.9
Purchases - assets	11.5	4.5	22.6	25.5
Sales - assets	0.0	0.0	(14.9)	(0.1)
Foreign exchange revaluation	1.7	0.4	2.5	(0.5)
Balance at End of Period - assets	188.4	140.7	188.4	140.7
Change in unrealized gains (losses) included in net income relating to assets held at end of period	15.4	4.2	16.3	0.8
Debt Securities [Member]
Schedule Of Consolidated Investment Products [Line Items]
Balance at beginning of period - assets	136.2	124.4	135.4	132.3
Realized and unrealized gains (losses) included in investment and other income, net - assets	2.0	(14.2)	2.1	(14.5)
Purchases - assets	10.5	5.6	10.5	7.8
Sales - assets	(37.7)	(1.9)	(37.7)	(8.3)
Foreign exchange revaluation	1.2	0.5	1.9	(2.4)
Balance at End of Period - assets	112.2	114.4	112.2	114.4
Change in unrealized gains (losses) included in net income relating to assets held at end of period	$ 0.0	$ (14.3)	$ 0.1	$ (15.0)
ASU 2015-02 [Member]
Schedule Of Consolidated Investment Products [Line Items]
Adoption of new accounting guidance					$ (45.9)
ASU 2015-02 [Member] \| Equity Securities [Member]
Schedule Of Consolidated Investment Products [Line Items]
Adoption of new accounting guidance					(45.4)
ASU 2015-02 [Member] \| Debt Securities [Member]
Schedule Of Consolidated Investment Products [Line Items]
Adoption of new accounting guidance					$ (0.5)

Consolidated Investment Products - Schedule of Valuation Techniques and Significant Unobservable Inputs used in Level 3 Fair Value Measurements (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
	Mar. 31, 2018	Sep. 30, 2017
Equity Securities [Member] \| Minimum [Member] \| Market comparable [Member]
Schedule Of Consolidated Investment Products [Line Items]
EBITDA multiple	5	5.5
Equity Securities [Member] \| Minimum [Member] \| Discounted cash flow [Member]
Schedule Of Consolidated Investment Products [Line Items]
Discount rate	5.70%	5.70%
Equity Securities [Member] \| Maximum [Member] \| Market comparable [Member]
Schedule Of Consolidated Investment Products [Line Items]
EBITDA multiple	13.6	12.3
Equity Securities [Member] \| Maximum [Member] \| Discounted cash flow [Member]
Schedule Of Consolidated Investment Products [Line Items]
Discount rate	16.50%	17.90%
Equity Securities [Member] \| Weighted Average [Member] \| Market comparable [Member]
Schedule Of Consolidated Investment Products [Line Items]
EBITDA multiple	9.1	9.0
Equity Securities [Member] \| Weighted Average [Member] \| Discounted cash flow [Member]
Schedule Of Consolidated Investment Products [Line Items]
Discount rate	13.50%	14.30%
Equity Securities [Member] \| Weighted Average [Member] \| Market Pricing [Member]
Schedule Of Consolidated Investment Products [Line Items]
Price to earnings ratio		$ 10.0
Debt Securities [Member] \| Minimum [Member] \| Discounted cash flow [Member]
Schedule Of Consolidated Investment Products [Line Items]
Discount rate	5.70%	5.00%
Risk premium		0.00%
Debt Securities [Member] \| Minimum [Member] \| Market Pricing [Member]
Schedule Of Consolidated Investment Products [Line Items]
Private sale pricing		$ 0.33
Debt Securities [Member] \| Maximum [Member] \| Discounted cash flow [Member]
Schedule Of Consolidated Investment Products [Line Items]
Discount rate	14.60%	33.00%
Risk premium		25.00%
Debt Securities [Member] \| Maximum [Member] \| Market Pricing [Member]
Schedule Of Consolidated Investment Products [Line Items]
Private sale pricing		$ 0.57
Debt Securities [Member] \| Weighted Average [Member] \| Market comparable [Member]
Schedule Of Consolidated Investment Products [Line Items]
EBITDA multiple	20.9
Price to earnings ratio	$ 10.0
Debt Securities [Member] \| Weighted Average [Member] \| Discounted cash flow [Member]
Schedule Of Consolidated Investment Products [Line Items]
Discount rate	10.00%	9.50%
Risk premium		8.40%
Debt Securities [Member] \| Weighted Average [Member] \| Market Pricing [Member]
Schedule Of Consolidated Investment Products [Line Items]
Private sale pricing	$ 0.33	$ 0.52
CIPs [Member]
Schedule Of Consolidated Investment Products [Line Items]
Equity securities	$ 353.9	$ 306.9
Debt securities	111.7	143.3
CIPs [Member] \| Level 3 [Member] \| Market comparable [Member]
Schedule Of Consolidated Investment Products [Line Items]
Equity securities	160.9	101.9
Debt securities	31.1
CIPs [Member] \| Level 3 [Member] \| Discounted cash flow [Member]
Schedule Of Consolidated Investment Products [Line Items]
Equity securities	27.5	44.4
Debt securities	77.8	112.7
CIPs [Member] \| Level 3 [Member] \| Market Pricing [Member]
Schedule Of Consolidated Investment Products [Line Items]
Equity securities		14.4
Debt securities	$ 3.3	$ 22.7

Consolidated Investment Products - Schedule of Financial Instruments of CIPs not Measured at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016
Financial Assets [Abstract]
Cash and cash equivalents	$ 8,726.5	$ 8,749.7	$ 8,776.1	$ 8,483.3
Financial Liabilities [Abstract]
Debt	1,044.8	1,044.2
CIPs [Member]
Financial Assets [Abstract]
Cash and cash equivalents	181.1	226.4
Financial Liabilities [Abstract]
Debt	34.0	53.4
Carrying Value [Member]
Financial Assets [Abstract]
Cash and cash equivalents	8,545.4	8,523.3
Carrying Value [Member] \| CIPs [Member]
Financial Assets [Abstract]
Cash and cash equivalents	181.1	226.4
Financial Liabilities [Abstract]
Debt	34.0	53.4
Estimated Fair Value [Member] \| Level 1 [Member]
Financial Assets [Abstract]
Cash and cash equivalents	8,545.4	8,523.3
Estimated Fair Value [Member] \| CIPs [Member] \| Level 1 [Member]
Financial Assets [Abstract]
Cash and cash equivalents	181.1	226.4
Estimated Fair Value [Member] \| CIPs [Member] \| Level 3 [Member]
Financial Liabilities [Abstract]
Debt	$ 33.7	$ 53.1

Consolidated Investment Products - Schedule of Redeemable Noncontrolling Interest of CIPs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Oct. 01, 2016
Temporary Equity [Line Items]
Balance at beginning of period			$ 1,941.9	$ 61.1
Net income (loss)	$ 15.2	$ 20.3	26.7	(3.2)
Net subscriptions and other			5.7	15.7
Net consolidations			(2.1)
Balance at End of Period	$ 2,084.4	$ 1,659.8	2,084.4	1,659.8
Redeemable noncontrolling interests [Member]
Temporary Equity [Line Items]
Net subscriptions and other			115.8	349.2
Net consolidations			$ 0.0	$ 428.0
ASU 2015-02 [Member]
Temporary Equity [Line Items]
Adoption of new accounting guidance					$ (325.9)
ASU 2015-02 [Member] \| Redeemable noncontrolling interests [Member]
Temporary Equity [Line Items]
Adoption of new accounting guidance					$ 824.7

Nonconsolidated Variable Interest Entities (Details) - Nonconsolidated VIEs [Member] - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Variable Interest Entity [Line Items]
Maximum exposure to loss	$ 229.1	$ 284.9
Receivables [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	156.7	155.6
Investments [Member]
Variable Interest Entity [Line Items]
Maximum exposure to loss	$ 72.4	$ 129.3

Taxes on Income - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Examination [Line Items]
Effective income tax rate	23.70%		106.90%
Scenario, Forecast [Member]
Income Tax Examination [Line Items]
Federal portion of the transition tax liability, payment percentage				21.00%	24.50%
Effective income tax rate					70.00%
Tax Cuts and Jobs Act [Member]
Income Tax Examination [Line Items]
Estimated transition tax expense	$ (0.5)	$ 1,120.7	$ 1,120.2
Decrease in deferred tax assets		(35.7)
Increase Decrease Deferred Tax Liabilities		88.8
Decrease in deferred tax liabilities	0.5	$ 53.1	(53.6)
Tax Cuts and Jobs Act [Member] \| Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Estimated transition tax expense			$ 1,101.0
First Five Years [Member]
Income Tax Examination [Line Items]
Federal Portion Transition Tax Liability, Payment Percentage			8.00%
Year Six [Member]
Income Tax Examination [Line Items]
Federal Portion Transition Tax Liability, Payment Percentage			15.00%
Year Seven [Member]
Income Tax Examination [Line Items]
Federal Portion Transition Tax Liability, Payment Percentage			20.00%
Year Eight [Member]
Income Tax Examination [Line Items]
Federal Portion Transition Tax Liability, Payment Percentage			25.00%
ASU 2018-02 [Member]
Income Tax Examination [Line Items]
Adoption of new accounting guidance	(0.1)		$ (0.1)
ASU 2018-02 [Member] \| Unrealized Losses on Defined Benefit Plans [Member]
Income Tax Examination [Line Items]
Adoption of new accounting guidance	$ (0.1)		$ (0.1)

Taxes on Income - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Deferred tax assets, net of valuation allowance	$ 95.2	$ 141.3
Deferred tax liabilities	204.2	296.1
Net Deferred Tax Liability	$ 109.0	$ 154.8

Taxes on Income - Components of Net Deferred Tax Assets or Liabilities as Classified in the Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Mar. 31, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Other assets	$ 20.9	$ 15.8
Deferred tax liabilities	129.9	170.6
Net Deferred Tax Liability	$ 109.0	$ 154.8

Taxes on Income - Taxes on income and the related impact on the effective income tax rate (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Tax expense before one-time charges	$ 151.0			$ 305.6
Tax expense before one-time charges, percentage	23.90%			23.80%
Total	$ 150.2		$ 192.5	$ 1,373.7	$ 393.4
Total, percentage	23.70%			106.90%
Tax Cuts and Jobs Act [Member]
Income Tax Examination [Line Items]
Transition tax on deemed repatriation of undistributed foreign earnings	$ (0.5)	$ 1,120.7		$ 1,120.2
Transition tax on deemed repatriation of undistributed foreign earnings, percentage	(0.10%)			87.20%
Revaluation of net deferred tax liabilities	$ 0.5	$ 53.1		$ (53.6)
Revaluation of net deferred tax liabilities, percentage	(0.10%)			(4.20%)
Other Tax Act impacts	$ 0.2			$ 1.5
Other Tax Act impacts, percentage	0.00%			0.10%

Commitments and Contingencies - Narrative (Details) $ in Millions	6 Months Ended
	Mar. 31, 2018 USD ($)
Plaintiff Cryer 401K Plan [Member]
Loss Contingencies [Line Items]
The plaintiff alleges that plan losses exceed	$ 79.0
Plaintiff Fernandez 401K Plan [Member]
Loss Contingencies [Line Items]
The plaintiff alleges that plan losses exceed	$ 60.0

Stock-Based Compensation - Narrative (Details) $ in Millions	6 Months Ended
	Mar. 31, 2018 USD ($)
Share-based Compensation [Abstract]
Unrecognized compensation expense related to nonvested stock and stock unit awards, net of estimated forfeitures	$ 180.6
Remaining weighted-average vesting period	1 year 11 months

Stock-Based Compensation (Details) shares in Thousands	6 Months Ended
Stock-Based Compensation (Details) shares in Thousands	Mar. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested balance at October 1, 2017	4,544
Granted	2,957
Vested	(652)
Forfeited/canceled	(284)
Nonvested Balance at March 31, 2018	6,565
Nonvested beginning balance, Weighted Average Grant Date Fair Value \| $ / shares	$ 37.23
Weighted Average Grant Date Fair Value of shares granted \| $ / shares	42.76
Weighted Average Grant Date Fair Value of shares vested \| $ / shares	39.22
Weighted Average Grant Date Fair Value of shares forfeited/canceled \| $ / shares	45.99
Nonvested ending balance, Weighted Average Grant Date Fair Value \| $ / shares	$ 39.14
Time-Based Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested balance at October 1, 2017	2,783
Granted	2,243
Vested	(140)
Forfeited/canceled	(146)
Nonvested Balance at March 31, 2018	4,740
Performance-Based Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested balance at October 1, 2017	1,761
Granted	714
Vested	(512)
Forfeited/canceled	(138)
Nonvested Balance at March 31, 2018	1,825

Other Income (Expenses) - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Proceeds from the sale of available-for-sale securities	$ 25.4	$ 17.2	$ 41.4	$ 25.8
Net gains recognized on trading investment securities	2.1	1.2	3.3	1.4
Net gains (losses) recognized on trading investment securities of CIPs	$ (30.1)	$ 27.0	$ (10.0)	$ 8.4

Other Income (Expenses) - Schedule of Other Income (Expense) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Interest income	$ 25.7	$ 16.0	$ 49.5	$ 29.6
Dividend income	8.7	2.7	13.4	5.1
Gains on trading investment securities, net	1.8	8.4	2.5	10.4
Realized gains on sale of investment securities, available-for-sale	2.1	2.3	2.1	2.9
Realized losses on sale of investment securities, available-for-sale	(0.4)	(0.5)	(0.4)	(1.2)
Income from investments in equity method investees	10.7	36.3	45.9	70.5
Other-than-temporary impairment of investments	(0.1)	0.0	(0.6)	(0.3)
Gains (losses) on investments of CIPs, net	38.6	22.7	54.6	(7.2)
Foreign currency exchange gains (losses), net	(7.8)	(6.2)	(10.7)	13.6
Other, net	8.1	2.9	12.4	7.3
Total	87.4	84.6	168.7	130.7
Interest Expense	(10.0)	(12.6)	(20.8)	(25.9)
Other Income, Net	$ 77.4	$ 72.0	$ 147.9	$ 104.8

Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Oct. 01, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (266.6)	$ (417.8)	$ (284.8)	$ (347.4)
Other comprehensive income (loss) before reclassifications, net of tax	10.2	45.8	28.4	(17.7)
Reclassifications to net investment and other income, net of tax	(3.2)	(1.2)	(3.2)	(1.0)
Total other comprehensive income (loss)	7.0	44.6	25.2	(18.7)
Balance at end of period	(259.7)	(373.2)	(259.7)	(373.2)
Unrealized Gains (Losses) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	5.7	(2.4)	2.2	6.8
Other comprehensive income (loss) before reclassifications, net of tax	1.5	6.6	5.0	4.0
Reclassifications to net investment and other income, net of tax	(1.7)	(1.2)	(1.7)	(1.0)
Total other comprehensive income (loss)	(0.2)	5.4	3.3	3.0
Balance at end of period	5.5	3.0	5.5	3.0
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(265.2)	(407.3)	(281.0)	(346.1)
Other comprehensive income (loss) before reclassifications, net of tax	8.3	39.2	24.1	(21.7)
Reclassifications to net investment and other income, net of tax	(1.5)	0.0	(1.5)	0.0
Total other comprehensive income (loss)	6.8	39.2	22.6	(21.7)
Balance at end of period	(258.4)	(368.1)	(258.4)	(368.1)
Unrealized Losses on Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(7.1)	(8.1)	(6.0)	(8.1)
Other comprehensive income (loss) before reclassifications, net of tax	0.4	0.0	(0.7)	0.0
Reclassifications to net investment and other income, net of tax	0.0	0.0	0.0	0.0
Total other comprehensive income (loss)	0.4	0.0	(0.7)	0.0
Balance at end of period	(6.8)	$ (8.1)	(6.8)	$ (8.1)
ASU 2018-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of new accounting guidance	(0.1)		(0.1)
ASU 2018-02 [Member] \| Unrealized Losses on Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of new accounting guidance	$ (0.1)		$ (0.1)
ASU 2015-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of new accounting guidance					$ (325.9)
ASU 2015-02 [Member] \| Unrealized Gains (Losses) on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of new accounting guidance					(6.8)
ASU 2015-02 [Member] \| Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of new accounting guidance					(0.3)
ASU 2015-02 [Member] \| Unrealized Losses on Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of new accounting guidance					0.0
ASU 2015-02 [Member] \| AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of new accounting guidance					$ (7.1)

Subsequent Event - Narrative (Details) - NotesDueMay2020 [Member] - Subsequent Event [Member] $ in Millions	Apr. 20, 2018 USD ($)
Subsequent Event [Line Items]
Senior notes	$ 350.0
Stated interest rate	4.625%
Redemption price, approximate	$ 363.0