ENLINK MIDSTREAM PARTNERS, LP, 10-Q filed on 8/1/2018
Quarterly Report
v3.10.0.1
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2018
Jul. 26, 2018
Document And Entity Information [Abstract]    
Document Type 10-Q  
Document Fiscal Period Focus Q2  
Document Period End Date Jun. 30, 2018  
Document Fiscal Year Focus 2018  
Amendment Flag false  
Entity Registrant Name ENLINK MIDSTREAM PARTNERS, LP  
Entity Central Index Key 0001179060  
Entity Current Reporting Status Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   350,346,037
v3.10.0.1
Consolidated Balance Sheets - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 36.5 $ 30.8
Accounts receivable:    
Trade, net of allowance for bad debt of $0.3 and $0.3, respectively 73.2 50.1
Accrued revenue and other 579.4 576.6
Related party 122.7 102.7
Fair value of derivative assets 4.0 6.8
Natural gas and NGLs inventory, prepaid expenses, and other 97.6 39.7
Total current assets 913.4 806.7
Property and equipment, net of accumulated depreciation of $2,745.8 and $2,533.0, respectively 6,763.2 6,587.0
Intangible assets, net of accumulated amortization of $360.4 and $298.7, respectively 1,435.4 1,497.1
Goodwill 422.3 422.3
Investment in unconsolidated affiliates 85.5 89.4
Other assets, net 40.3 11.5
Total assets 9,660.1 9,414.0
Current liabilities:    
Accounts payable and drafts payable 115.2 66.9
Accounts payable to related party 30.5 18.4
Accrued gas, NGLs, condensate, and crude oil purchases 509.2 476.1
Fair value of derivative liabilities 10.7 8.4
Installment payable, net of discount of $0.5 at December 31, 2017 0.0 249.5
Current maturities of long-term debt 399.4 0.0
Other current liabilities 205.3 222.4
Total current liabilities 1,270.3 1,041.7
Long-term debt 3,590.2 3,467.8
Asset retirement obligations 14.5 14.2
Other long-term liabilities 21.2 33.9
Deferred tax liability 44.5 46.3
Fair value of derivative liabilities 8.9 0.0
Redeemable non-controlling interest 4.6 4.6
Partners’ equity:    
Common unitholders (350,257,779 and 349,702,372 units issued and outstanding, respectively) 2,603.0 2,791.6
General partner interest (1,594,974 equivalent units outstanding) 206.6 207.3
Accumulated other comprehensive loss (2.1) (2.1)
Non-controlling interest 626.7 549.5
Total partners’ equity 4,705.9 4,805.5
Total liabilities and partners’ equity 9,660.1 9,414.0
Series B Preferred Unitholders    
Partners’ equity:    
Preferred unitholders 876.6 864.1
Series C Preferred Unitholders    
Partners’ equity:    
Preferred unitholders $ 395.1 $ 395.1
v3.10.0.1
Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Assets [Abstract]    
Allowance for bad debt $ 0.3 $ 0.3
Accumulated depreciation 2,745.8 2,533.0
Accumulated amortization 360.4 298.7
Liabilities [Abstract]    
Discount of installment payable, current $ 0.0 $ 0.5
Partners’ equity:    
Common units issued (in shares) 350,257,779 349,702,372
Common units outstanding (in shares) 350,257,779 349,702,372
General partner interest, equivalent units outstanding (in shares) 1,594,974 1,594,974
Series B Preferred Unitholders    
Partners’ equity:    
Preferred units issued (in shares) 57,886,596 57,056,281
Preferred unit outstanding (in shares) 57,886,596 57,056,281
Series C Preferred Unitholders    
Partners’ equity:    
Preferred unit outstanding (in shares) 400,000 400,000
v3.10.0.1
Consolidated Statements of Operations - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues:        
Product sales $ 1,435.1 $ 927.2 $ 2,934.3 $ 1,917.2
Product sales—related parties 27.2 29.3 30.8 72.0
Midstream services 142.4 131.9 234.6 259.3
Midstream services—related parties 175.2 173.6 341.4 332.6
Gain (loss) on derivative activity (15.2) 1.6 (14.7) 4.4
Total revenues 1,764.7 1,263.6 3,526.4 2,585.5
Operating costs and expenses:        
Cost of sales [1] 1,325.6 932.4 2,707.1 1,934.7
Operating expenses 113.4 102.6 222.6 206.7
General and administrative 29.1 29.6 55.3 64.6
(Gain) loss on disposition of assets 1.2 (5.4) 1.3 (0.3)
Depreciation and amortization 145.3 142.5 283.4 270.8
Impairments 0.0 0.0 0.0 7.0
Gain on litigation settlement 0.0 (8.5) 0.0 (26.0)
Total operating costs and expenses 1,614.6 1,193.2 3,269.7 2,457.5
Operating income 150.1 70.4 256.7 128.0
Other income (expense):        
Interest expense, net of interest income (43.7) (47.1) (87.4) (91.6)
Gain on extinguishment of debt 0.0 9.0 0.0 9.0
Income (loss) from unconsolidated affiliates 4.4 (0.1) 7.4 0.6
Other income 0.0 0.2 0.2 0.2
Total other expense (39.3) (38.0) (79.8) (81.8)
Income before non-controlling interest and income taxes 110.8 32.4 176.9 46.2
Income tax benefit (provision) 2.1 0.3 1.1 (0.2)
Net income 112.9 32.7 178.0 46.0
Net income (loss) attributable to non-controlling interest 14.0 3.1 19.0 (1.7)
Net income attributable to ENLK 98.9 29.6 159.0 47.7
General partner interest in net income 11.2 10.8 21.8 16.7
Limited partners’ interest in net income (loss) attributable to ENLK $ 58.9 $ (0.5) $ 80.5 $ (9.8)
Net income (loss) attributable to ENLK per limited partners’ unit:        
Basic common unit (in dollars per share) $ 0.17 $ 0.00 $ 0.23 $ (0.03)
Diluted common unit (in dollars per share) $ 0.17 $ 0.00 $ 0.23 $ (0.03)
Series B Preferred Unitholders        
Other income (expense):        
Preferred interest in net income attributable to ENLK $ 22.8 $ 19.3 $ 44.7 $ 40.8
Series C Preferred Unitholders        
Other income (expense):        
Preferred interest in net income attributable to ENLK $ 6.0 $ 0.0 $ 12.0 $ 0.0
[1] Includes related party cost of sales of $46.7 million and $50.9 million for the three months ended June 30, 2018 and 2017, respectively, and $80.8 million and $79.6 million for the six months ended June 30, 2018 and 2017, respectively.
v3.10.0.1
Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]        
Related party cost of sales $ 46.7 $ 50.9 $ 80.8 $ 79.6
v3.10.0.1
Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net income $ 112.9 $ 32.7 $ 178.0 $ 46.0
Loss on designated cash flow hedge 0.0 (2.2) 0.0 (2.2)
Comprehensive income 112.9 30.5 178.0 43.8
Comprehensive income (loss) attributable to non-controlling interest 14.0 3.1 19.0 (1.7)
Comprehensive income attributable to EnLink Midstream Partners, LP $ 98.9 $ 27.4 $ 159.0 $ 45.5
v3.10.0.1
Consolidated Statement of Changes in Partners' Equity - 6 months ended Jun. 30, 2018 - USD ($)
shares in Millions, $ in Millions
Total
Non-Controlling Interest
Redeemable Noncontrolling Interest
Accumulated Other Comprehensive Loss
General Partner Interest
Common Units
Limited Partner
Series B Preferred Unitholders
Limited Partner
Series C Preferred Unitholders
Limited Partner
Beginning balance at Dec. 31, 2017 $ 4,805.5 $ 549.5   $ (2.1) $ 207.3 $ 2,791.6 $ 864.1 $ 395.1
Beginning balance (in shares) at Dec. 31, 2017         1.6 349.7 57.1 0.4
Increase (Decrease) in Partners' Capital                
Issuance of common units 0.9         $ 0.9    
Issuance of common units (in shares)           0.1    
Conversion of restricted units for common units, net of units withheld for taxes (3.4)         $ (3.4)    
Conversion of restricted units for common units, net of units withheld for taxes (in shares)           0.5    
Unit-based compensation 16.8       $ 8.4 $ 8.4    
Distributions (373.5) (23.4)     (30.9) (275.0) $ (32.2) $ (12.0)
Distributions (in shares)             0.8  
Contributions from non-controlling interests 81.6 81.6            
Net income 178.0 19.0     21.8 80.5 $ 44.7 12.0
Ending balance at Jun. 30, 2018 $ 4,705.9 $ 626.7   $ (2.1) $ 206.6 $ 2,603.0 $ 876.6 $ 395.1
Ending balance (in shares) at Jun. 30, 2018         1.6 350.3 57.9 0.4
Beginning balance at Dec. 31, 2017     $ 4.6          
Ending balance at Jun. 30, 2018     $ 4.6          
v3.10.0.1
Consolidated Statements of Cash Flows - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 178.0 $ 46.0
Adjustments to reconcile net income to net cash provided by operating activities:    
Impairments 0.0 7.0
Depreciation and amortization 283.4 270.8
Non-cash unit-based compensation 14.6 28.6
(Gain) loss on derivatives recognized in net income 14.7 (4.4)
Gain on extinguishment of debt 0.0 (9.0)
Cash settlements on derivatives (0.4) (6.0)
Amortization of debt issue costs, net discount (premium) of notes and installment payable 2.4 14.2
Distribution of earnings from unconsolidated affiliates 9.5 0.0
Income from unconsolidated affiliates (7.4) (0.6)
Non-cash revenue from contract restructuring (45.5) 0.0
Other operating activities (0.9) 0.0
Changes in assets and liabilities, net of assets acquired and liabilities assumed:    
Accounts receivable, accrued revenue, and other (46.6) 56.1
Natural gas and NGLs inventory, prepaid expenses, and other (40.2) (34.1)
Accounts payable, accrued gas and crude oil purchases, and other accrued liabilities 69.1 (36.4)
Net cash provided by operating activities 430.7 332.2
Cash flows from investing activities:    
Additions to property and equipment (404.4) (471.7)
Proceeds from sale of unconsolidated affiliate investment 0.0 189.7
Investment in unconsolidated affiliates (0.1) (10.3)
Distribution from unconsolidated affiliates in excess of earnings 1.9 7.4
Other investing activities 0.8 1.3
Net cash used in investing activities (401.8) (283.6)
Cash flows from financing activities:    
Proceeds from borrowings 1,346.0 1,750.9
Payments on borrowings (826.0) (1,373.3)
Payment of installment payable for EOGP acquisition (250.0) (250.0)
Debt financing costs 0.0 (5.7)
Proceeds from issuance of common units 0.9 72.2
Distributions to non-controlling interests (23.4) (8.3)
Contributions by non-controlling interests, including contributions from affiliates of $27.3 and $43.0, respectively 81.6 71.5
Distributions to common unitholders and to general partner (305.9) (300.8)
Other financing activities (2.2) (5.5)
Net cash used in financing activities (23.2) (49.0)
Net increase (decrease) in cash and cash equivalents 5.7 (0.4)
Cash and cash equivalents, beginning of period 30.8 11.6
Cash and cash equivalents, end of period 36.5 11.2
Supplemental disclosures of cash flow information:    
Cash paid for interest 87.6 78.2
Cash paid for income taxes 0.4 3.2
Non-cash investing activities:    
Non-cash accrual of property and equipment (5.0) (5.2)
Discounted secured term loan receivable from contract restructuring 47.7 0.0
Series B Preferred Unitholders    
Cash flows from financing activities:    
Distributions to Series B Preferred Units (32.2) 0.0
Series C Preferred Unitholders    
Cash flows from financing activities:    
Distributions to Series B Preferred Units $ (12.0) $ 0.0
v3.10.0.1
Consolidated Statements of Cash Flows (Parenthetical) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Proceeds from affiliates $ 81.6 $ 71.5
Affiliates    
Proceeds from affiliates $ 27.3 $ 43.0
v3.10.0.1
General
6 Months Ended
Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
General
(1) General
 
In this report, the term “Partnership,” as well as the terms “ENLK,” “our,” “we,” “us,” and “its” are sometimes used as abbreviated references to EnLink Midstream Partners, LP itself or EnLink Midstream Partners, LP together with its consolidated subsidiaries, including the Operating Partnership and EOGP.
 
Please read the notes to the consolidated financial statements in conjunction with the Definitions page set forth in this report prior to Part I—Financial Information.

(a)
Organization of Business
 
EnLink Midstream Partners, LP is a publicly traded Delaware limited partnership formed in 2002. Our common units are traded on the New York Stock Exchange under the symbol “ENLK.” Our business activities are conducted through our subsidiary, the Operating Partnership, and the subsidiaries of the Operating Partnership.
 
EnLink Midstream GP, LLC, a Delaware limited liability company, is our general partner. Our general partner manages our operations and activities. Our general partner is an indirect, wholly-owned subsidiary of ENLC. ENLC’s units are traded on the New York Stock Exchange under the symbol “ENLC.”

Prior to July 18, 2018, subsidiaries of Devon collectively owned a 100% equity interest in ENLC’s managing member, common units of ENLC representing approximately 63.8% of the outstanding limited liability company interests in ENLC, and approximately 23.1% of the outstanding limited partner interests in ENLK. On July 18, 2018, the Devon subsidiaries sold all of these interests to GIP. See Note 13—Subsequent Event for more information regarding this transaction.
(b)
Nature of Business
 
We primarily focus on providing midstream energy services, including:

gathering, compressing, treating, processing, transporting, storing, and selling natural gas;
fractionating, transporting, storing, and selling NGLs; and
gathering, transporting, stabilizing, storing, trans-loading, and selling crude oil and condensate, in addition to brine disposal services.

Our natural gas business includes connecting the wells of producers in our market areas to our gathering systems. Our gathering systems consist of networks of pipelines that collect natural gas from points at or near producing wells and transport it to our processing plants or to larger pipelines for further transmission. We operate processing plants that remove NGLs from the natural gas stream that is transported to the processing plants by our own gathering systems or by third-party pipelines. In conjunction with our gathering and processing business, we may purchase natural gas and NGLs from producers and other supply sources and sell that natural gas or NGLs to utilities, industrial consumers, marketers, and pipelines. Our transmission pipelines receive natural gas from our gathering systems and from third-party gathering and transmission systems and deliver natural gas to industrial end-users, utilities, and other pipelines.

Our fractionators separate NGLs into separate purity products, including ethane, propane, iso-butane, normal butane, and natural gasoline. Our fractionators receive NGLs primarily through our transmission lines that transport NGLs from East Texas and from our South Louisiana processing plants. Our fractionators also have the capability to receive NGLs by truck or rail terminals. We also have agreements pursuant to which third parties transport NGLs from our West Texas and Central Oklahoma operations to our NGL transmission lines that then transport the NGLs to our fractionators. In addition, we have NGL storage capacity to provide storage for customers.

Our crude oil and condensate business includes the gathering and transmission of crude oil and condensate via pipelines, barges, rail, and trucks, in addition to condensate stabilization and brine disposal. We also purchase crude oil and condensate from producers and other supply sources and sell that crude oil and condensate through our terminal facilities to various markets.

Across our businesses, we primarily earn our fees through various fee-based contractual arrangements, which include stated fee-only contract arrangements or arrangements with fee-based components where we purchase and resell commodities in connection with providing the related service and earn a net margin as our fee. We earn our net margin under our purchase and resell contract arrangements primarily as a result of stated service-related fees that are deducted from the price of the commodities purchased. While our transactions vary in form, the essential element of most of our transactions is the use of our assets to transport a product or provide a processed product to an end-user or marketer at the tailgate of the plant, pipeline, or barge, truck, or rail terminal.
v3.10.0.1
Significant Accounting Policies
6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Significant Accounting Policies
(2) Significant Accounting Policies

(a)
Basis of Presentation

The accompanying consolidated financial statements are prepared in accordance with the instructions to Form 10-Q, are unaudited, and do not include all the information and disclosures required by GAAP for complete financial statements. All adjustments that, in the opinion of management, are necessary for a fair presentation of the results of operations for the interim periods have been made and are of a recurring nature unless otherwise disclosed herein. The results of operations for such interim periods are not necessarily indicative of results of operations for a full year. All significant intercompany balances and transactions have been eliminated in consolidation.

(b)
Revenue Recognition

We generate the majority of our revenues from midstream energy services, including gathering, transmission, processing, fractionation, storage, condensate stabilization, brine services, and marketing, through various contractual arrangements, which include fee-based contract arrangements or arrangements where we purchase and resell commodities in connection with providing the related service and earn a net margin for our fee. While our transactions vary in form, the essential element of most of our transactions is the use of our assets to transport a product or provide a processed product to an end-user or marketer at the tailgate of the plant, pipeline, or barge, truck, or rail terminal. Revenues from both “Product sales” and “Midstream services” represent revenues from contracts with customers and are reflected on the consolidated statements of operations as follows:

Product sales—Product sales represent the sale of natural gas, NGLs, crude oil, and condensate where the product is purchased and resold in connection with providing our midstream services as outlined above.

Midstream services—Midstream services represent all other revenue generated as a result of performing our midstream services as outlined above.

Adoption of ASC 606

Effective January 1, 2018, we adopted ASC 606 using the modified retrospective method. ASC 606 replaces previous revenue recognition requirements in GAAP and requires entities to recognize revenue at an amount that reflects the consideration to which they expect to be entitled in exchange for transferring goods or services to a customer. ASC 606 also requires significantly expanded disclosures containing qualitative and quantitative information regarding the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers.

Evaluation of Our Contractual Performance Obligations

In adopting ASC 606, we evaluated our contracts with customers that are within the scope of ASC 606. In accordance with the new revenue recognition framework introduced by ASC 606, we identified our performance obligations under our contracts with customers. These performance obligations include:

promises to perform midstream services for our customers over a specified contractual term and/or for a specified volume of commodities; and

promises to sell a specified volume of commodities to our customers.

The identification of performance obligations under our contracts requires a contract-by-contract evaluation of when control, including the economic benefit, of commodities transfers to and from us (if at all). This evaluation of control changed the way we account for certain transactions effective January 1, 2018, specifically those contracts in which there is both a commodity purchase and a midstream service. For contracts where control of commodities transfers to us before we perform our services, we generally have no performance obligation for our services, and accordingly, we do not consider these revenue-generating contracts for purposes of ASC 606. Based on the control determination, all contractually-stated fees that are deducted from our payments to producers or other suppliers for commodities purchased are reflected as a reduction in the cost of such commodity purchases. Alternatively, for contracts where control of commodities transfers to us after we perform our services, we consider these contracts to contain performance obligations for our services. Accordingly, we consider the satisfaction of these performance obligations as revenue-generating and recognize the fees received for satisfying them as midstream service revenues over time as we satisfy our performance obligations. For contracts where control of commodities never transfers to us and we simply earn a fee for our services, we recognize these fees as midstream services revenues over time as we satisfy our performance obligations.

We also evaluate our contractual arrangements that contain a purchase and sale of commodities under the principal/agent provisions in ASC 606. For contracts where we possess control of the commodity and act as principal in the purchase and sale, we record product sales revenue at the price at which the commodities are sold, with a corresponding cost of sales equal to the cost of the commodities when purchased. For contracts in which we do not possess control of the commodity and are acting as an agent, our consolidated statements of operations only reflect midstream services revenues that we earn based on the fees contained in the applicable contract.

Based on our review of our performance obligations in our contracts with customers, we changed the consolidated statement of operations classification for certain transactions from revenue to cost of sales or from cost of sales to revenue. For the three and six months ended June 30, 2018, the reclassification of revenues and cost of sales resulted in a net decrease in revenue of approximately $163 million and $301 million, respectively, or 9% and 8%, respectively, compared to total revenues based on accounting prior to the adoption of ASC 606, with an equivalent net decrease in cost of sales. The change in total revenues as a result of the adoption of ASC 606 is made up of the following revenue line item changes (in millions):

 
 
Increase (Decrease) in Revenue Due to
ASC 606 Adoption
 
 
Three Months Ended June 30, 2018
 
Six Months Ended June 30, 2018
Product sales
 
$
(46
)
 
$
(78
)
Product sales—related parties
 
(24
)
 
(46
)
Midstream services
 
(76
)
 
(153
)
Midstream services—related parties
 
(17
)
 
(24
)
Total
 
$
(163
)
 
$
(301
)


This change in accounting treatment had no impact on our operating income, net income, results of operations, financial condition, or cash flows.

Changes in Accounting Methodology for Certain Contracts

For NGL contracts in which we purchase raw mix NGLs and subsequently transport, fractionate, and market the NGLs, we accounted for these contracts prior to the adoption of ASC 606 as revenue-generating contracts in which the fees we earned for our services were recorded as midstream services revenue on the consolidated statements of operations. As a result of the adoption of ASC 606, we determined that the control, including the economic benefit, of commodities has passed to us once the raw mix NGLs have been purchased from the customer. Therefore, we now consider the contractually-stated fees to serve as pricing mechanisms that reduce the cost of such commodity purchased upon receipt of the raw mix NGLs, rather than being recorded as midstream services revenue. Upon sale of the NGLs to a third-party customer, we record product sales revenue at the price at which the commodities are sold, with a corresponding cost of sales equal to the cost of the commodities purchased.

For our crude oil and condensate service contracts in which we purchase the commodity, we utilize a similar approach under ASC 606 as outlined above for NGL contracts. This treatment is consistent with our accounting for crude oil and condensate service contracts prior to the adoption of ASC 606.

For our natural gas gathering and processing contracts in which we perform midstream services and also purchase the natural gas, we accounted for these contracts prior to the adoption of ASC 606 as revenue-generating contracts in which all contractually-stated fees earned for our gathering and processing services were recorded as midstream services revenue on the statements of operations. As a result of the adoption of ASC 606, we must determine if economic control of the commodities has passed from the producer to us before or after we perform our services (if at all). Control is assessed on a contract-by-contract basis by analyzing each contract’s provisions, which can include provisions for: the customer to take its residue gas and/or NGLs in-kind; fixed or actual NGL or keep-whole recovery; commodity purchase prices at weighted average sales price or market index-based pricing; and various other contract-specific considerations. Based on this control assessment, our gathering and processing contracts fall into two primary categories:

For gathering and processing contracts in which there is a commodity purchase and analysis of the contract provisions indicates that control, including the economic benefit, of the natural gas passes to us when the natural gas is brought into our system, we do not consider these contracts to contain performance obligations for our services. As control of the natural gas passes to us prior to performing our gathering and processing services, we are, in effect, performing our services for our own benefit. Based on this control determination, we consider the contractually-stated fees to serve as pricing mechanisms that reduce the cost of such commodity purchased upon receipt of the natural gas, rather than being recorded as midstream services revenue. Upon sale of the residue gas and/or NGLs to a third-party customer, we record product sales revenue at the price at which the commodities are sold, with a corresponding cost of sales equal to the cost of the commodities purchased.

For gathering and processing contracts in which there is a commodity purchase and analysis of the contract provisions indicates that control, including the economic benefit, of the natural gas does not pass to us until after the natural gas has been gathered and processed, we consider these contracts to contain performance obligations for our services. Accordingly, we consider the satisfaction of these performance obligations as revenue-generating, and we recognize the fees received for satisfying these performance obligations as midstream service revenues over time as we satisfy our performance obligations.

For midstream service contracts related to NGL, crude oil, or natural gas gathering and processing in which there is no commodity purchase or control of the commodity never passes to us and we simply earn a fee for our services, we consider these contracts to contain performance obligations for our services. Accordingly, we consider the satisfaction of these performance obligations as revenue-generating, and we recognize the fees received for satisfying these performance obligations as midstream service revenues over time as we satisfy our performance obligations. This treatment is consistent with our accounting for these contracts prior to the adoption of ASC 606.

For our natural gas transmission contracts, we determined that control of the natural gas never transfers to us and we simply earn a fee for our services. Therefore, we recognize these fees as midstream services revenues over time as we satisfy our performance obligations. This treatment is consistent with our accounting for natural gas transmission contracts prior to the adoption of ASC 606.

We also evaluate our commodity marketing contracts, under which we purchase and sell commodities in connection with our gas, NGL, crude, and condensate midstream services, pursuant to ASC 606, including the principal/agent provisions. For contracts in which we possess control of the commodity and act as principal in the purchase and sale of commodities, we record product sales revenue at the price at which the commodities are sold, with a corresponding cost of sales equal to the cost of the commodities when purchased. For contracts in which we do not possess control of the commodity and are acting as agent, our consolidated statements of operations only reflect midstream services revenues that we earn based on the fees contained in the applicable contract. This treatment is consistent with our accounting for our commodity marketing contracts prior to the adoption of ASC 606.

Satisfaction of Performance Obligations and Recognition of Revenue

While ASC 606 alters the line item on which certain amounts are recorded on the consolidated statements of operations, ASC 606 did not significantly affect the timing of income and expense recognition on the consolidated statements of operations. Specifically, for our commodity sales contracts, we satisfy our performance obligations at the point in time at which the commodity transfers from us to the customer. This transfer pattern aligns with our billing methodology. Therefore, we recognize product sales revenue at the time the commodity is delivered and in the amount to which we have the right to invoice the customer, which is consistent with our accounting prior to the adoption of ASC 606. For our midstream service contracts that contain revenue-generating performance obligations, we satisfy our performance obligations over time as we perform the midstream service and as the customer receives the benefit of these services over the term of the contract. As permitted by ASC 606, we are utilizing the practical expedient that allows an entity to recognize revenue in the amount to which the entity has a right to invoice, since we have a right to consideration from our customer in an amount that corresponds directly with the value to the customer of our performance completed to date. Accordingly, we continue to recognize revenue over time as our midstream services are performed. Therefore, ASC 606 does not significantly affect the timing of revenue and expense recognition on our consolidated statements of operations, and no cumulative effect adjustment was made to the balance of equity upon our adoption of ASC 606.

We generally accrue one month of sales and the related natural gas, NGL, condensate, and crude oil purchases and reverse these accruals when the sales and purchases are invoiced and recorded in the subsequent month. Actual results could differ from the accrual estimates. We typically receive payment for invoiced amounts within one month, depending on the terms of the contract. We account for taxes collected from customers attributable to revenue transactions and remitted to government authorities on a net basis (excluded from revenues).

Minimum Volume Commitments and Firm Transportation Contracts

Certain gathering and processing agreements in our Texas, Oklahoma, and Crude and Condensate segments provide for quarterly or annual MVCs, including MVCs from Devon from certain of our Barnett Shale assets in North Texas and our Cana gathering and processing assets in Oklahoma. Under these agreements, our customers or suppliers (as “customers” and “suppliers” are determined per application of ASC 606) agree to ship and/or process a minimum volume of product on our systems over an agreed time period. If a customer or supplier under such an agreement fails to meet its MVC for a specified period, the customer is obligated to pay a contractually-determined fee based upon the shortfall between actual product volumes and the MVC for that period. Some of these agreements also contain make-up right provisions that allow a customer or supplier to utilize gathering or processing fees in excess of the MVC in subsequent periods to offset shortfall amounts in previous periods. We record revenue under MVC contracts during periods of shortfall when it is known that the customer cannot, or will not, make up the deficiency in subsequent periods. Deficiency fee revenue is included in midstream services revenues.

For our firm transportation contracts, we transport commodities owned by others for a stated monthly fee for a specified monthly quantity with an additional fee based on actual volumes. We include transportation fees from firm transportation contracts in our midstream services revenues.

The following table summarizes the expected impact to our consolidated statements of operations, resulting from either revenue or reductions to cost of sales, from MVC and firm transportation contractual provisions. All amounts in the table below reflect the contractually-stated MVC or firm transportation volumes specified for each period multiplied by the relevant deficiency or reservation fee. Actual amounts could differ due to the timing of revenue recognition or reductions to cost of sales resulting from make-up right provisions included in our agreements, as well as due to nonpayment or nonperformance by our customers. In addition, amounts in the table below do not represent the shortfall amounts we expect to collect under our MVC contracts as we generally do not expect volume shortfalls to equal the full amount of the contractual MVCs during these periods.
2018 (remaining)
$
388.4

2019
235.8

2020
224.8

2021
82.2

2022
71.9

Thereafter
231.2

Total
$
1,234.3



In May 2018, we restructured one of our natural gas gathering and processing contracts that included MVCs that were in effect through 2023. Prior to the contract restructuring, we expected $135.1 million in guaranteed future gross operating margin under the contract, generated from either revenue or reductions to cost of sales resulting from both gathering and processing fees as well as shortfall revenue under the MVCs. As a result of the contract restructuring, all MVC provisions were removed from the contract, and we and the counterparty entered into additional agreements pursuant to which: (i) the counterparty made a $19.7 million payment to us on the date of the contract restructuring to satisfy MVC revenue earned up to the date of the contract restructuring; (ii) the counterparty entered into a second lien secured term loan under which the counterparty will pay us $58.0 million in principal payments in various installments ending in May 2023, with interest accruing on the loan balance at 8.0% per annum beginning in 2020; and (iii) the counterparty granted to us a 1.0% term overriding royalty interest through June 2034 in each well located on leasehold interests of the counterparty and connected to the gas gathering system that we operate. As a result of the contract restructuring and in accordance with ASC 606, we recognized $45.5 million of midstream services revenue, which primarily represents the discounted present value of the second lien secured term loan receivable, in the Oklahoma segment in the second quarter of 2018. Pursuant to the contract restructuring, the terms of the restructured contract, other than the MVCs, are the same as the original contract, and we expect to continue recognizing gathering and processing fees on volumes delivered by the customer.
Contributions in Aid of Construction

The adoption of ASC 606 also alters how we account for contributions in aid of construction (“CIAC”). CIAC payments are lump sum payments from third parties to reimburse us for capital expenditures related to the construction of our operating assets and, in most cases, the connection of these operating assets to the third party’s assets. CIAC payments can be paid to us prior to the commencement of construction activities, during construction, or after construction has been completed. Prior to adoption of ASC 606 and in accordance with ASC 980, Regulated Operations (“ASC 980”), and the FERC Uniform System of Accounts, we reduced the balance of the related property and equipment by the amount of CIAC payments received. In doing so, CIAC payments previously affected the consolidated statements of operations through reduced depreciation expense over the useful lives of the related property and equipment. Upon adoption of ASC 606, we initially recognize CIAC payments received from customers as deferred revenue, which will be subsequently amortized into revenue over the term of the underlying operational contract. For CIAC payments from noncustomers and for payments related to the construction of regulated operating assets, we continue to reduce the balance of the related property and equipment in accordance with ASC 980 and the FERC Uniform System of Accounts. This change in our CIAC accounting policy was not material to our financial statements for the three and six months ended June 30, 2018.

Disaggregation of Revenue and Presentation of Prior Periods

Based on the disclosure requirements of ASC 606, we are presenting revenues disaggregated based on the type of good or service in order to more fully depict the nature of our revenues. See Note 11—Segment Information for the revenue disaggregation information included in the segment information table for the three and six months ended June 30, 2018. As we adopted ASC 606 using the modified retrospective method, only the consolidated statement of operations and revenue disaggregation information for the three and six months ended June 30, 2018 are presented to conform to ASC 606 accounting and disclosure requirements. Prior periods presented in the consolidated financial statements and accompanying notes were not restated in accordance with ASC 606.

(c)    Accounting Standards to be Adopted in Future Periods

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842)Amendments to the FASB Accounting Standards Codification (“ASU 2016-02”), which establishes ASC Topic 842, Leases (“ASC 842”). Under ASC 842, lessees will need to recognize virtually all of their leases on the balance sheet by recording a right-of-use asset and lease liability. Lessor accounting is similar to the current model, but updated to align with certain changes to the lessee model and the new revenue recognition standard. Existing sale-leaseback guidance is replaced with a new model applicable to both lessees and lessors. Additional revisions have been made to embedded leases, reassessment requirements, and lease term assessments including variable lease payment, discount rate, and lease incentives. ASC 842 is effective for annual reporting periods beginning after December 15, 2018, including interim periods within those annual periods. Entities are required to adopt ASC 842 using a modified retrospective transition. We will adopt ASC 842 effective January 1, 2019. We are currently assessing the impact of adopting ASC 842 and are in the process of implementing a lease accounting software tool. This assessment includes the evaluation of our current lease contracts and the analysis of contracts that may contain lease components. While we cannot currently estimate the quantitative effect that ASC 842 will have on our consolidated financial statements, the adoption of ASC 842 will increase our asset and liability balances on the consolidated balance sheets due to the required recognition of right-of-use assets and corresponding lease liabilities for all lease obligations that are currently classified as operating leases. In addition, there are industry-specific concerns with the implementation of ASC 842 that will require further evaluation before we are able to fully assess the impact of ASC 842 on our consolidated financial statements.  

In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842)—Land Easement Practical Expedient for Transition to Topic 842 (“ASU 2018-01”). ASU 2018-01 amends ASC 842 and provides an optional practical expedient to not evaluate under ASC 842 existing or expired land easements that were not previously accounted for as leases under the current leases guidance in ASC 840, Leases. Under ASU 2018-01, an entity that elects this practical expedient should evaluate new or modified land easements under ASC 842 beginning at the date that the entity adopts ASC 842. We plan to utilize the practical expedient provided in ASU 2018-01 in conjunction with our adoption of ASC 842.

(d)    Property & Equipment

Impairment Review. In accordance with ASC 360, Property, Plant and Equipment, we evaluate long-lived assets of identifiable business activities for potential impairment whenever events or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. The carrying amount of a long-lived asset is not recoverable when it exceeds the undiscounted sum of the future cash flows expected to result from the use and eventual disposition of the asset. Estimates of expected future cash flows represent management’s best estimate based on reasonable and supportable assumptions. When the carrying amount of a long-lived asset is not recoverable, an impairment loss is recognized equal to the excess of the asset’s carrying value over its fair value. For the six months ended June 30, 2017, we recognized impairments of property and equipment of $7.0 million, which related to the carrying values of rights-of-way that we are no longer using and an abandoned brine disposal well. We did not recognize impairments for any other period presented in the consolidated statements of operations.
v3.10.0.1
Intangible Assets
6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
(3) Intangible Assets

Intangible assets associated with customer relationships are amortized on a straight-line basis over the expected period of benefits of the customer relationships, which range from 10 to 20 years.

The following table represents our change in carrying value of intangible assets (in millions):
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Six Months Ended June 30, 2018
 
 
 
 
 
Customer relationships, beginning of period
$
1,795.8

 
$
(298.7
)
 
$
1,497.1

Amortization expense

 
(61.7
)
 
(61.7
)
Customer relationships, end of period
$
1,795.8

 
$
(360.4
)
 
$
1,435.4


 
The weighted average amortization period is 15.0 years. Amortization expense was $30.9 million and $35.5 million for the three months ended June 30, 2018 and 2017, respectively, and $61.7 million and $65.0 million for the six months ended June 30, 2018 and 2017, respectively.

The following table summarizes our estimated aggregate amortization expense for the next five years and thereafter (in millions):
2018 (remaining)
$
61.8

2019
123.4

2020
123.4

2021
123.4

2022
123.4

Thereafter
880.0

Total
$
1,435.4

v3.10.0.1
Related Party Transactions
6 Months Ended
Jun. 30, 2018
Related Party Transactions [Abstract]  
Related Party Transactions
(4) Related Party Transactions
 
We engage in various transactions with Devon and other related parties. For the three and six months ended June 30, 2018, Devon accounted for 11.5% and 10.6% of our revenues, respectively, and for the three and six months ended June 30, 2017, Devon accounted for 15.8% and 15.3% of our revenues, respectively. We had an accounts receivable balance related to transactions with Devon of $122.1 million at June 30, 2018 and $102.7 million at December 31, 2017. Additionally, we had an accounts payable balance related to transactions with Devon of $27.0 million at June 30, 2018 and $16.3 million at December 31, 2017.

On July 18, 2018, subsidiaries of Devon sold all of their equity interests in ENLK, ENLC, and the managing member of ENLC to GIP. Accordingly, Devon is no longer an affiliate of ENLK or ENLC. The sale did not affect our commercial arrangements with Devon, except that Devon agreed to extend through 2029 certain existing, fixed-fee gathering and processing contracts related to the Bridgeport plant in North Texas and the Cana plant in Oklahoma. See Note 13—Subsequent Event for additional information regarding Devon’s sale to GIP.

For the three and six months ended June 30, 2018, we recorded cost of sales of $9.5 million and $22.5 million, respectively, and for the three and six months ended June 30, 2017, we recorded cost of sales of $4.3 million and $5.5 million, respectively, related to our purchase of residue gas and NGLs from the Cedar Cove JV subsequent to processing at our Central Oklahoma processing facilities. We had an accounts receivable balance related to transactions with Cedar Cove of $0.6 million at June 30, 2018. Additionally, we had an accounts payable balance related to transactions with Cedar Cove of $3.5 million at June 30, 2018. The accounts receivable and payable balances related to transactions with Cedar Cover were immaterial at December 31, 2017.

Management believes these transactions are executed on terms that are fair and reasonable to us. The amounts related to related party transactions are specified in the accompanying consolidated financial statements.
v3.10.0.1
Long-Term Debt
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Long-Term Debt
(5) Long-Term Debt

As of June 30, 2018 and December 31, 2017, long-term debt consisted of the following (in millions):
 
June 30, 2018
 
December 31, 2017
 
Outstanding Principal
 
Premium (Discount)
 
Long-Term Debt
 
Outstanding Principal
 
Premium (Discount)
 
Long-Term Debt
Credit facility due 2020 (1)
$
520.0

 
$

 
$
520.0

 
$

 
$

 
$

2.70% Senior unsecured notes due 2019 (2)
400.0

 
(0.1
)
 
399.9

 
400.0

 
(0.1
)
 
399.9

4.40% Senior unsecured notes due 2024
550.0

 
2.0

 
552.0

 
550.0

 
2.2

 
552.2

4.15% Senior unsecured notes due 2025
750.0

 
(0.9
)
 
749.1

 
750.0

 
(1.0
)
 
749.0

4.85% Senior unsecured notes due 2026
500.0

 
(0.6
)
 
499.4

 
500.0

 
(0.6
)
 
499.4

5.60% Senior unsecured notes due 2044
350.0

 
(0.2
)
 
349.8

 
350.0

 
(0.2
)
 
349.8

5.05% Senior unsecured notes due 2045
450.0

 
(6.3
)
 
443.7

 
450.0

 
(6.5
)
 
443.5

5.45% Senior unsecured notes due 2047
500.0

 
(0.1
)
 
499.9

 
500.0

 
(0.1
)
 
499.9

Debt classified as long-term, including current maturities of long-term debt
$
4,020.0

 
$
(6.2
)
 
4,013.8

 
$
3,500.0

 
$
(6.3
)
 
3,493.7

Debt issuance cost (3)
 
 
 
 
(24.2
)
 
 
 
 
 
(25.9
)
Less: Current maturities of long-term debt (2)
 
 
 
 
(399.4
)
 
 
 
 
 

Long-term debt, net of unamortized issuance cost
 
 
 
 
$
3,590.2

 
 
 
 
 
$
3,467.8

                                                           
(1)
Bears interest based on Prime and/or LIBOR plus an applicable margin. The effective interest rate was 3.6% at June 30, 2018.
(2)
The 2.70% senior unsecured notes mature on April 1, 2019. Therefore, the outstanding principal balance, net of discount and debt issuance costs, is classified as “Current maturities of long-term debt” on the consolidated balance sheet as of June 30, 2018.
(3)
Net of amortization of $13.7 million and $12.0 million at June 30, 2018 and December 31, 2017, respectively.

Credit Facility

We have a $1.5 billion unsecured revolving credit facility that matures on March 6, 2020 and includes a $500.0 million letter of credit subfacility. Under our credit facility, we are permitted to (1) subject to certain conditions and the receipt of additional commitments by one or more lenders, increase the aggregate commitments under our credit facility by an additional amount not to exceed $500.0 million and (2) subject to certain conditions and the consent of the requisite lenders, on two separate occasions, extend the maturity date of our credit facility by one year on each occasion. Our credit facility contains certain financial, operational, and legal covenants. Among other things, these covenants include maintaining a ratio of consolidated indebtedness to consolidated EBITDA (which is defined in our credit facility and includes projected EBITDA from certain capital expansion projects) of no more than 5.0 to 1.0. If we consummate one or more acquisitions in which the aggregate purchase price is $50.0 million or more, we can elect to increase the maximum allowed ratio of consolidated indebtedness to consolidated EBITDA to 5.5 to 1.0 for the quarter of the acquisition and the three following quarters.

Borrowings under our credit facility bear interest at our option at the Eurodollar Rate (the LIBOR Rate) plus an applicable margin (ranging from 1.00% to 1.75%) or the Base Rate (the highest of the Federal Funds Rate plus 0.50%, the 30-day Eurodollar Rate plus 1.0% or the administrative agent’s prime rate) plus an applicable margin (ranging from 0.0% to 0.75%). The applicable margins vary depending on our credit rating. If we breach certain covenants governing our credit facility, amounts outstanding under our credit facility, if any, may become due and payable immediately.

On June 20, 2018, we amended the change of control provisions of our credit facility to, among other things, designate GIP as Qualifying Owners (as defined in the credit facility). At June 30, 2018, we were in compliance and expect to be in compliance with the covenants in our credit facility for at least the next twelve months.

As of June 30, 2018, there were $9.3 million in outstanding letters of credit and $520.0 million outstanding borrowings under our credit facility, leaving approximately $970.7 million available for future borrowing.

All other material terms and conditions of our credit facility and outstanding senior unsecured notes are described in Part II, “Item 8. Financial Statements and Supplementary Data—Note 6” in our Annual Report on Form 10-K for the year ended December 31, 2017.
v3.10.0.1
Partners' Capital
6 Months Ended
Jun. 30, 2018
Partners' Capital Notes [Abstract]  
Partners' Capital
(6) Partners' Capital
 
(a)
Issuance of Common Units
 
In August 2017, we entered into the 2017 EDA with UBS Securities LLC, Barclays Capital Inc., BMO Capital Markets Corp., Merrill Lynch, Pierce, Fenner & Smith Incorporated, Citigroup Global Markets Inc., Jefferies LLC, Mizuho Securities USA LLC, RBC Capital Markets, LLC, SunTrust Robinson Humphrey, Inc. and Wells Fargo Securities, LLC (collectively, the “Sales Agents”) to sell up to $600.0 million in aggregate gross sales of our common units from time to time through an “at the market” equity offering program. We may also sell common units to any Sales Agent as principal for the Sales Agent’s own account at a price agreed upon at the time of sale. We have no obligation to sell any of the common units under the 2017 EDA and may at any time suspend solicitation and offers under the 2017 EDA.
    
For the six months ended June 30, 2018, we sold an aggregate of approximately 0.1 million common units under the 2017 EDA, generating proceeds of approximately $0.9 million (net of less than $0.1 million of commissions paid to the Sales Agents). We used the net proceeds for general partnership purposes. As of June 30, 2018, approximately $564.5 million in aggregate gross proceeds remains available to be issued under the 2017 EDA.

(b) Series B Preferred Units

Beginning with the quarter ended September 30, 2017, Series B Preferred Unit distributions are payable quarterly in cash at an amount equal to $0.28125 per Series B Preferred Unit (the “Cash Distribution Component”) plus an in-kind distribution equal to the greater of (A) 0.0025 Series B Preferred Units per Series B Preferred Unit and (B) an amount equal to (i) the excess, if any, of the distribution that would have been payable had the Series B Preferred Units converted into common units over the Cash Distribution Component, divided by (ii) the issue price of $15.00. Income is allocated to the Series B Preferred Units in an amount equal to the quarterly distribution with respect to the period earned. For the three and six months ended June 30, 2018, $22.8 million and $44.7 million of income, respectively, was allocated to the Series B Preferred Units. For the three and six months ended June 30, 2017$19.3 million and $40.8 million of income, respectively, was allocated to the Series B Preferred Units.

A summary of the distribution activity relating to the Series B Preferred Units during the six months ended June 30, 2018 and 2017 is provided below:
Declaration period
 
Distribution paid as additional Series B Preferred Units
 
Cash Distribution (in millions)
 
Date paid/payable
2018
 
 
 
 
 
 
Fourth Quarter of 2017
 
413,658

 
$
16.0

 
February 13, 2018
First Quarter of 2018
 
416,657

 
$
16.2

 
May 14, 2018
Second Quarter of 2018
 
419,678

 
$
16.3

 
August 13, 2018
 
 
 
 
 
 
 
2017
 
 
 
 
 
 
Fourth Quarter of 2016
 
1,130,131

 
$

 
February 13, 2017
First Quarter of 2017
 
1,154,147

 
$

 
May 12, 2017
Second Quarter of 2017
 
1,178,672

 
$

 
August 11, 2017

(c)
Series C Preferred Units

Distributions on the Series C Preferred Units accrue and are cumulative from the date of original issue and payable semi-annually in arrears on the 15th day of June and December of each year through and including December 15, 2022 and, thereafter, quarterly in arrears on the 15th day of March, June, September, and December of each year, in each case, if and when declared by our general partner out of legally available funds for such purpose. The distribution rate for the Series C Preferred Units is 6.0% per annum, and we distributed $12.0 million to holders of Series C Preferred Units during the six months ended June 30, 2018. Income is allocated to the Series C Preferred Units in an amount equal to the earned distributions for the respective reporting period. For the three and six months ended June 30, 2018$6.0 million and $12.0 million of income was allocated to the Series C Preferred Units, respectively.

(d)
Common Unit Distributions
 
Unless restricted by the terms of our credit facility and/or the indentures governing our senior unsecured notes, we must make distributions of 100% of available cash, as defined in our partnership agreement, within 45 days following the end of each quarter. Distributions of available cash are made to our general partner in accordance with its current percentage interest with the remainder to the common unitholders, subject to the payment of incentive distributions as described below to the extent that certain target levels of cash distributions are achieved. The general partner is not entitled to incentive distributions with respect to (i) distributions on the Series B Preferred Units until such units convert into common units or (ii) the Series C Preferred Units.
 
Our general partner owns the general partner interest in us and all incentive distribution rights. Our general partner is entitled to receive incentive distributions if the amount we distribute with respect to any quarter exceeds levels specified in the partnership agreement. Under the quarterly incentive distribution provisions, our general partner is entitled to 13.0% of amounts we distribute in excess of $0.25 per unit, 23.0% of the amounts we distribute in excess of $0.3125 per unit, and 48.0% of amounts we distribute in excess of $0.375 per unit.

A summary of the distribution activity relating to the common units during the six months ended June 30, 2018 and 2017 is provided below:
Declaration period
 
Distribution/unit
 
Date paid/payable
2018
 
 
 
 
Fourth Quarter of 2017
 
$
0.39

 
February 13, 2018
First Quarter of 2018
 
$
0.39

 
May 14, 2018
Second Quarter of 2018
 
$
0.39

 
August 13, 2018
 
 
 
 
 
2017
 
 
 
 
Fourth Quarter of 2016
 
$
0.39

 
February 13, 2017
First Quarter of 2017
 
$
0.39

 
May 12, 2017
Second Quarter of 2017
 
$
0.39

 
August 11, 2017


(e)
Earnings Per Unit and Dilution Computations

As required under ASC 260, Earnings Per Share, unvested share-based payments that entitle employees to receive non-forfeitable distributions are considered participating securities for earnings per unit calculations. The following table reflects the computation of basic and diluted earnings per limited partner unit for the periods presented (in millions, except per unit amounts):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Limited partners’ interest in net income (loss)
$
58.9

 
$
(0.5
)
 
$
80.5

 
$
(9.8
)
Distributed earnings allocated to:
 
 
 
 
 
 
 
Common units (1) (2)
$
136.6

 
$
135.3

 
$
273.1

 
$
269.3

Unvested restricted units (1) (2)
1.1

 
1.0

 
1.9

 
1.9

Total distributed earnings
$
137.7

 
$
136.3

 
$
275.0

 
$
271.2

Undistributed loss allocated to:
 
 
 
 
 
 
 
Common units
$
(78.1
)
 
$
(135.8
)
 
$
(193.1
)
 
$
(279.0
)
Unvested restricted units
(0.7
)
 
(1.0
)
 
(1.4
)
 
(2.0
)
Total undistributed loss
$
(78.8
)
 
$
(136.8
)
 
$
(194.5
)
 
$
(281.0
)
Net income (loss) allocated to:
 
 
 
 
 
 
 
Common units
$
58.5

 
$
(0.5
)
 
$
80.0

 
$
(9.7
)
Unvested restricted units
0.4

 

 
0.5

 
(0.1
)
Total limited partners’ interest in net income (loss)
$
58.9

 
$
(0.5
)
 
$
80.5

 
$
(9.8
)
Basic and diluted net income (loss) per unit:
 
 
 
 
 
 
 
Basic
$
0.17

 
$

 
$
0.23

 
$
(0.03
)
Diluted
$
0.17

 
$

 
$
0.23

 
$
(0.03
)
                                                           
(1)
For the three months ended June 30, 2018 and 2017, distributed earnings represent a declared distribution of $0.39 per unit payable on August 13, 2018 and a distribution of $0.39 per unit paid on August 11, 2017, respectively.
(2)
For the six months ended June 30, 2018, distributed earnings included a distribution of $0.39 per unit paid on May 14, 2018 and a declared distribution of $0.39 per unit payable on August 13, 2018. For the six months ended June 30, 2017, distributed earnings included distributions of $0.39 per unit paid on May 12, 2017 and $0.39 per unit paid on August 11, 2017.

The following are the unit amounts used to compute the basic and diluted earnings per unit for the periods presented (in millions): 
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Basic weighted average units outstanding:
 
 
 
 
 
 
 
 
Weighted average limited partner basic common units outstanding
 
350.2

 
346.9

 
350.2

 
345.2

 
 
 
 
 
 
 
 
 
Diluted weighted average units outstanding:
 
 
 
 
 
 
 
 
Weighted average limited partner basic common units outstanding
 
350.2

 
346.9

 
350.2

 
345.2

Dilutive effect of non-vested restricted units (1)
 
1.4

 

 
1.3

 

Total weighted average limited partner diluted common units outstanding
 
351.6

 
346.9

 
351.5

 
345.2


                                                           
(1)
All common unit equivalents were antidilutive for the three and six months ended June 30, 2017 because the limited partners were allocated a net loss. The Series B Preferred Units were also antidilutive for the three and six months ended June 30, 2018.
 
All outstanding units were included in the computation of diluted earnings per unit and weighted based on the number of days such units were outstanding during the periods presented.

Net income is allocated to our general partner in an amount equal to its incentive distribution rights as described in section “(d) Common Unit Distributions” above. Our general partner’s share of net income consists of incentive distribution rights to the extent earned, a deduction for unit-based compensation attributable to ENLC’s restricted units, and the percentage interest of our net income adjusted for ENLC’s unit-based compensation specifically allocated to our general partner. The net income allocated to our general partner is as follows (in millions):
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2018
 
2017
 
2018
 
2017
Income allocation for incentive distributions
 
$
14.8

 
$
14.6

 
$
29.6

 
$
29.3

Unit-based compensation attributable to ENLC’s restricted units
 
(4.0
)
 
(3.9
)
 
(8.4
)
 
(12.7
)
General partner share of net income
 
0.4

 
0.1

 
0.6

 
0.1

General partner interest in net income
 
$
11.2

 
$
10.8

 
$
21.8

 
$
16.7

v3.10.0.1
Investment in Unconsolidated Affiliates
6 Months Ended
Jun. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]  
Investment in Unconsolidated Affiliates
(7) Investment in Unconsolidated Affiliates
 
As of June 30, 2018, our unconsolidated investments consisted of a contractual right to the economic benefits and burdens associated with Devon’s 38.75% ownership in GCF and an approximate 30% ownership in the Cedar Cove JV.

The following table shows the activity related to our investment in unconsolidated affiliates for the periods indicated (in millions):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
GCF
 
 
 
 
 
 
 
Distributions
$
5.4

 
$
4.4

 
$
11.1

 
$
7.1

Equity in income
$
4.8

 
$

 
$
9.4

 
$
4.0

 
 
 
 
 
 
 
 
HEP
 
 
 
 
 
 
 
Equity in loss (1)
$

 
$

 
$

 
$
(3.4
)
 
 
 
 
 
 
 
 
Cedar Cove JV
 
 
 
 
 
 
 
Contributions
$
0.1

 
$
4.3

 
$
0.1

 
$
10.3

Distributions
$

 
$
0.1

 
$
0.3

 
$
0.3

Equity in loss
$
(0.4
)
 
$
(0.1
)
 
$
(2.0
)
 
$

 
 
 
 
 
 
 
 
Total
 
 
 
 
 
 
 
Contributions
$
0.1

 
$
4.3

 
$
0.1

 
$
10.3

Distributions
$
5.4

 
$
4.5

 
$
11.4

 
$
7.4

Equity in income (loss) (1)
$
4.4

 
$
(0.1
)
 
$
7.4

 
$
0.6

(1)
We sold our ownership interest in HEP during the first quarter of 2017, resulting in a loss of $3.4 million for the six months ended June 30, 2017.

The following table shows the balances related to our investment in unconsolidated affiliates as of June 30, 2018 and December 31, 2017 (in millions): 
 
June 30, 2018
 
December 31, 2017
GCF
$
46.7

 
$
48.4

Cedar Cove JV
38.8

 
41.0

Total investment in unconsolidated affiliates
$
85.5

 
$
89.4

v3.10.0.1
Employee Incentive Plans
6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Employee Incentive Plans
(8) Employee Incentive Plans
 
(a)
Long-Term Incentive Plans
 
We and ENLC each have similar unit-based compensation payment plans for officers and employees. We grant unit-based awards under the amended and restated EnLink Midstream GP, LLC Long-Term Incentive Plan (the “GP Plan”), and ENLC grants unit-based awards under the EnLink Midstream, LLC 2014 Long-Term Incentive Plan (the “2014 Plan”).

We account for unit-based compensation in accordance with ASC 718, Stock Compensation (“ASC 718”), which requires that compensation related to all unit-based awards be recognized in the consolidated financial statements. Unit-based compensation cost is valued at fair value at the date of grant, and that grant date fair value is recognized as expense over each award’s requisite service period with a corresponding increase to equity or liability based on the terms of each award and the appropriate accounting treatment under ASC 718. Unit-based compensation associated with ENLC’s unit-based compensation plan awarded to ENLC’s officers and employees is recorded by us since ENLC has no substantial or managed operating activities other than its interests in us and EOGP. Amounts recognized on the consolidated financial statements with respect to these plans are as follows (in millions):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Cost of unit-based compensation charged to operating expense
 
$
2.3

 
$
2.6

 
$
4.3

 
$
7.6

Cost of unit-based compensation charged to general and administrative expense
 
7.2

 
6.7

 
10.3

 
21.0

Total unit-based compensation expense
 
$
9.5

 
$
9.3

 
$
14.6

 
$
28.6



(b)
EnLink Midstream Partners, LP Restricted Incentive Units
 
ENLK restricted incentive units are valued at their fair value at the date of grant, which is equal to the market value of ENLK common units on such date. A summary of the restricted incentive unit activity for the six months ended June 30, 2018 is provided below:
 
 
Six Months Ended
June 30, 2018
EnLink Midstream Partners, LP Restricted Incentive Units:
 
Number of Units
 
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period
 
1,980,224

 
$
15.81

Granted (1)
 
1,166,464

 
15.15

Vested (1)(2)
 
(601,581
)
 
22.04

Forfeited
 
(148,572
)
 
12.29

Non-vested, end of period
 
2,396,535

 
$
14.14

Aggregate intrinsic value, end of period (in millions)
 
$
37.2

 
 

                                                           
(1)
Restricted incentive units typically vest at the end of three years. In March 2018, we granted 200,753 restricted incentive units with a fair value of $3.0 million to officers and certain employees as bonus payments for 2017, and these restricted incentive units vested immediately and are included in the restricted incentive units granted and vested line items.
(2)
Vested units included 189,584 units withheld for payroll taxes paid on behalf of employees.
 
A summary of the restricted incentive units’ aggregate intrinsic value (market value at vesting date) and fair value of units vested (market value at date of grant) for the three and six months ended June 30, 2018 and 2017 is provided below (in millions):
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
EnLink Midstream Partners, LP Restricted Incentive Units:
 
2018
 
2017
 
2018
 
2017
Aggregate intrinsic value of units vested
 
$
0.4

 
$
0.4

 
$
9.1

 
$
15.7

Fair value of units vested
 
$
0.5

 
$
0.5

 
$
13.3

 
$
21.0


 
As of June 30, 2018, there was $20.2 million of unrecognized compensation cost related to non-vested ENLK restricted incentive units. That cost is expected to be recognized over a weighted-average period of 1.9 years.
 
(c)
EnLink Midstream Partners, LP Performance Units
 
Our general partner grants performance awards under the GP Plan. The performance award agreements provide that the vesting of performance units (i.e., performance-based restricted incentive units) granted thereunder is dependent on the achievement of certain total shareholder return (“TSR”) performance goals relative to the TSR achievement of a peer group of companies (the “Peer Companies”) over the applicable performance period. The performance award agreements contemplate that the Peer Companies for an individual performance award (the “Subject Award”) are the companies comprising the AMZ, excluding ENLK and ENLC, on the grant date for the Subject Award. The performance units will vest based on the percentile ranking of the average of ENLK’s and ENLC’s TSR achievement (“EnLink TSR”) for the applicable performance period relative to the TSR achievement of the Peer Companies.

 At the end of the vesting period, recipients receive distribution equivalents, if any, with respect to the number of performance units vested. The vesting of units ranges from zero to 200% of the units granted depending on the EnLink TSR as compared to the TSR of the Peer Companies on the vesting date. The fair value of each performance unit is estimated as of the date of grant using a Monte Carlo simulation with the following assumptions used for all performance unit grants made under the plan: (i) a risk-free interest rate based on United States Treasury rates as of the grant date; (ii) a volatility assumption based on the historical realized price volatility of our common units and the designated Peer Companies securities; (iii) an estimated ranking of us among the designated Peer Companies; and (iv) the distribution yield. The fair value of the performance unit on the date of grant is expensed over a vesting period of approximately three years.     

The following table presents a summary of the grant-date fair value of performance units granted and the related assumptions by performance unit grant date:  
EnLink Midstream Partners, LP Performance Units:
 
March 2018
Beginning TSR price
 
$
15.44

Risk-free interest rate
 
2.38
%
Volatility factor
 
43.85
%
Distribution yield
 
10.5
%


The following table presents a summary of the performance units: 
 
 
Six Months Ended
June 30, 2018
EnLink Midstream Partners, LP Performance Units:
 
Number of Units
 
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period
 
585,285

 
$
20.52

Granted
 
256,345

 
19.24

Vested (1)
 
(115,328
)
 
35.39

Forfeited
 
(76,351
)
 
16.62

Non-vested, end of period
 
649,951

 
$
17.83

Aggregate intrinsic value, end of period (in millions)
 
$
10.1

 
 


                                                           
(1)
Vested units included 34,069 units withheld for payroll taxes paid on behalf of employees.
 
A summary of the performance units’ aggregate intrinsic value (market value at vesting date) and fair value of units vested (market value at date of grant) for the six months ended June 30, 2018 is provided below (in millions). No performance units vested for the three months ended June 30, 2018 or for the three and six months ended June 30, 2017.
EnLink Midstream Partners, LP Performance Units:
 
Six Months Ended June 30, 2018
Aggregate intrinsic value of units vested
 
$
2.0

Fair value of units vested
 
$
4.1



As of June 30, 2018, there was $7.4 million of unrecognized compensation cost that related to non-vested ENLK performance units. That cost is expected to be recognized over a weighted-average period of 2.0 years.
 
(d)
EnLink Midstream, LLC Restricted Incentive Units
 
ENLC restricted incentive units are valued at their fair value at the date of grant, which is equal to the market value of ENLC common units on such date. A summary of the restricted incentive unit activity for the six months ended June 30, 2018 is provided below:
 
 
Six Months Ended
June 30, 2018
EnLink Midstream, LLC Restricted Incentive Units:
 
Number of Units
 
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period
 
1,889,310

 
$
16.33

Granted (1)
 
1,059,062

 
15.67

Vested (1)(2)
 
(556,262
)
 
24.24

Forfeited
 
(138,187
)
 
12.24

Non-vested, end of period
 
2,253,923

 
$
14.32

Aggregate intrinsic value, end of period (in millions)
 
$
37.1

 
 

                                                           
(1)
Restricted incentive units typically vest at the end of three years. In March 2018, ENLC granted 194,185 restricted incentive units with a fair value of $3.0 million to officers and certain employees as bonus payments for 2017, and these restricted incentive units vested immediately and are included in the restricted incentive units granted and vested line items.
(2)
Vested units included 178,824 units withheld for payroll taxes paid on behalf of employees.

A summary of the restricted incentive units’ aggregate intrinsic value (market value at vesting date) and fair value of units vested (market value at date of grant) for the three and six months ended June 30, 2018 and 2017 is provided below (in millions):
 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
EnLink Midstream, LLC Restricted Incentive Units:
 
2018
 
2017
 
2018
 
2017
Aggregate intrinsic value of units vested
 
$
0.4

 
$
0.3

 
$
9.3

 
$
14.6

Fair value of units vested
 
$
0.4

 
$
0.4

 
$
13.5

 
$
20.8


 
As of June 30, 2018, there was $19.2 million of unrecognized compensation cost related to non-vested ENLC restricted incentive units. The cost is expected to be recognized over a weighted-average period of 1.9 years.
 
(e)
EnLink Midstream, LLC’s Performance Units
 
ENLC grants performance awards under the 2014 Plan. The performance award agreements provide that the vesting of performance units (i.e., performance-based restricted incentive units) granted thereunder is dependent on the achievement of certain TSR performance goals relative to the TSR achievement of the Peer Companies over the applicable performance period. At the end of the vesting period, recipients receive distribution equivalents, if any, with respect to the number of performance units vested. The vesting of units ranges from zero to 200% of the units granted depending on the EnLink TSR as compared to the TSR of the Peer Companies on the vesting date. The fair value of each performance unit is estimated as of the date of grant using a Monte Carlo simulation with the following assumptions used for all performance unit grants made under the plan: (i) a risk-free interest rate based on United States Treasury rates as of the grant date; (ii) a volatility assumption based on the historical realized price volatility of ENLC’s common units and the designated Peer Companies securities; (iii) an estimated ranking of ENLC among the designated Peer Companies, and (iv) the distribution yield. The fair value of the performance unit on the date of grant is expensed over a vesting period of approximately three years. The following table presents a summary of the grant-date fair value assumptions by performance unit grant date:

EnLink Midstream, LLC Performance Units:
 
March 2018
Beginning TSR price
 
$
16.55

Risk-free interest rate
 
2.38
%
Volatility factor
 
51.36
%
Distribution yield
 
6.7
%


 The following table presents a summary of the performance units:
 
 
Six Months Ended
June 30, 2018
EnLink Midstream, LLC Performance Units:
 
Number of Units
 
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period
 
548,839

 
$
22.14

Granted
 
223,865

 
21.63

Vested (1)
 
(102,555
)
 
40.48

Forfeited
 
(70,918
)
 
17.75

Non-vested, end of period
 
599,231

 
$
19.33

Aggregate intrinsic value, end of period (in millions)
 
$
9.9

 
 


                                                           
(1)
Vested units included 28,846 units withheld for payroll taxes paid on behalf of employees.

A summary of the performance units’ aggregate intrinsic value (market value at vesting date) and fair value of units vested (market value at date of grant) for the six months ended June 30, 2018 is provided below (in millions). No performance units vested for the three months ended June 30, 2018 or for the three and six months ended June 30, 2017.
EnLink Midstream, LLC Performance Units:
 
Six Months Ended June 30, 2018
Aggregate intrinsic value of units vested
 
$
1.9

Fair value of units vested
 
$
4.2



As of June 30, 2018, there was $7.5 million of unrecognized compensation cost that related to non-vested ENLC performance units. That cost is expected to be recognized over a weighted-average period of 2.0 years.
v3.10.0.1
Derivatives
6 Months Ended
Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivatives
(9) Derivatives

Interest Rate Swaps

We periodically enter into interest rate swaps in connection with new debt issuances. During the debt issuance process, we are exposed to variability in future long-term debt interest payments that may result from changes in the benchmark interest rate (commonly the U.S. Treasury yield) prior to the debt being issued. In order to hedge this variability, we enter into interest rate swaps to effectively lock in the benchmark interest rate at the inception of the swap. Prior to 2017, we did not designate interest rate swaps as hedges and, therefore, included the associated settlement gains and losses as interest expense, net of interest income on the consolidated statements of operations.

In May 2017, we entered into an interest rate swap in connection with the issuance of our 5.45% senior unsecured notes due 2047 (the “2047 Notes”). In accordance with ASC 815, we designated this swap as a cash flow hedge. Upon settlement of the interest rate swap in May 2017, we recorded the associated $2.2 million settlement loss in accumulated comprehensive loss on the consolidated balance sheets. We will amortize the settlement loss into interest expense on the consolidated statements of operations over the term of the 2047 Notes. There was no ineffectiveness related to the hedge. For the three and six months ended June 30, 2018, we amortized an immaterial amount of the settlement loss into interest expense from accumulated other comprehensive income (loss). We expect to recognize $0.1 million of interest expense out of accumulated other comprehensive income (loss) over the next twelve months. We have no open interest rate swap position as of June 30, 2018.

Commodity Swaps
 
We manage our exposure to changes in commodity prices by hedging the impact of market fluctuations. Commodity swaps are used both to manage and hedge price and location risk related to these market exposures and to manage margins on offsetting fixed-price purchase or sale commitments for physical quantities of crude, condensate, natural gas, and NGLs. We do not designate commodity swaps as cash flow or fair value hedges for hedge accounting treatment under ASC 815. Therefore, changes in the fair value of our derivatives are recorded in revenue in the period incurred. In addition, our risk management policy does not allow us to take speculative positions with our derivative contracts.

We commonly enter into index (float-for-float) or fixed-for-float swaps in order to mitigate our cash flow exposure to fluctuations in the future prices of natural gas, NGLs, and crude oil. For natural gas, index swaps are used to protect against the price exposure of daily priced gas versus first-of-month priced gas. They are also used to hedge the basis location price risk resulting from supply and markets being priced on different indices. For natural gas, NGLs, condensate, and crude oil, fixed-for-float swaps are used to protect cash flows against price fluctuations: (1) where we receive a percentage of liquids as a fee for processing third-party gas or where we receive a portion of the proceeds of the sales of natural gas and liquids as a fee, (2) in the natural gas processing and fractionation components of our business and (3) where we are mitigating the price risk for product held in inventory or storage.

Assets and liabilities related to our derivative contracts are included in the fair value of derivative assets and liabilities, and the change in fair value of these contracts is recorded net as a gain (loss) on derivative activity on the consolidated statements of operations. We estimate the fair value of all of our derivative contracts based upon actively-quoted prices of the underlying commodities.
 
The components of gain (loss) on derivative activity in the consolidated statements of operations related to commodity swaps are (in millions):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Change in fair value of derivatives
$
(10.5
)
 
$
1.8

 
$
(14.0
)
 
$
7.1

Realized loss on derivatives
(4.7
)
 
(0.2
)
 
(0.7
)
 
(2.7
)
Gain (loss) on derivative activity
$
(15.2
)
 
$