Consolidated Statements of Changes in Members' Equity - USD ($) $ in Millions	Total	Common Units	Accumulated Other Comprehensive Loss	Non-Controlling Interest	Redeemable Non-Controlling Interest (Temporary Equity)
Member equity, beginning balance at Dec. 31, 2015	$ 5,424.9	$ 2,285.7		$ 3,139.2
Units outstanding, beginning balance (in shares) at Dec. 31, 2015		164,200,000
Increase (Decrease) in Members' Equity
Issuance of common units by ENLK	167.5			167.5
Issuance of Preferred Units by ENLK	724.1			724.1
Issuance of common units	214.9	$ 214.9
Issuance of common units (in shares)		15,600,000
Conversion of restricted units for common units, net of units withheld for taxes	(1.2)	$ (1.2)
Conversion of restricted units for common units, net of units withheld for taxes (in shares)		200,000
Non-controlling interest’s impact of conversion of restricted units	(1.2)			(1.2)
Unit-based compensation	30.3	$ 15.1		15.2
Change in equity due to issuance of units by ENLK	(7.1)	11.8		(18.9)
Non-controlling interest distributions	(382.4)			(382.4)	$ (1.8)
Non-controlling interest contribution	167.9			167.9
Distributions	(185.4)	(185.4)
Contribution from Devon to ENLK	1.5			1.5
Net income (loss)	(888.2)	(460.0)		(428.2)
Member equity, end balance at Dec. 31, 2016	5,265.6	$ 1,880.9	$ 0.0	3,384.7
Units outstanding, end balance (in shares) at Dec. 31, 2016		180,000,000
Redeemable noncontrolling interest, beginning balance at Dec. 31, 2015					7.0
Increase (Decrease) in Temporary Equity
Distributions to redeemable non-controlling interest	(382.4)			(382.4)	(1.8)
Net income (loss)	(888.2)	$ (460.0)		(428.2)
Redeemable noncontrolling interest, ending balance at Dec. 31, 2016					5.2
Increase (Decrease) in Members' Equity
Issuance of common units by ENLK	106.9			106.9
Issuance of Preferred Units by ENLK	394.0			394.0
Conversion of restricted units for common units, net of units withheld for taxes	(4.8)	$ (4.8)
Conversion of restricted units for common units, net of units withheld for taxes (in shares)		600,000
Non-controlling interest’s impact of conversion of restricted units	(5.3)			(5.3)
Unit-based compensation	42.7	$ 21.3		21.4
Change in equity due to issuance of units by ENLK	0.1			0.1
Non-controlling interest distributions	(433.1)			(433.1)	(0.6)
Non-controlling interest contribution	57.3			57.3
Distributions	(186.0)	(186.0)
Contribution from Devon to ENLK	1.3			1.3
Loss on designated cash flow hedge, net of tax benefit and amortization to interest expense	(2.0)		(2.0)
Net income (loss)	320.0	212.8		107.2
Member equity, end balance at Dec. 31, 2017	$ 5,556.7	$ 1,924.2	(2.0)	3,634.5
Units outstanding, end balance (in shares) at Dec. 31, 2017	180,600,728	180,600,000
Increase (Decrease) in Temporary Equity
Distributions to redeemable non-controlling interest	$ (433.1)			(433.1)	(0.6)
Net income (loss)	320.0	$ 212.8		107.2
Redeemable noncontrolling interest, ending balance at Dec. 31, 2017					4.6
Increase (Decrease) in Members' Equity
Issuance of common units by ENLK	46.1			46.1
Conversion of restricted units for common units, net of units withheld for taxes	(5.7)	$ (5.7)
Conversion of restricted units for common units, net of units withheld for taxes (in shares)		700,000
Non-controlling interest’s impact of conversion of restricted units	(5.6)			(5.6)
Unit-based compensation	41.9	$ 20.5		21.4
Change in equity due to issuance of units by ENLK	0.1	0.7		(0.6)
Non-controlling interest distributions	(517.2)			(517.2)
Non-controlling interest contribution	90.2			90.2
Distributions	(194.8)	(194.8)
Fair value adjustment related to redeemable non-controlling interest	(4.1)	(0.8)		(3.3)	4.1
Net income (loss)	(33.4)	(13.2)		(20.2)	0.6
Member equity, end balance at Dec. 31, 2018	$ 4,974.2	$ 1,730.9	$ (2.0)	3,245.3
Units outstanding, end balance (in shares) at Dec. 31, 2018	181,309,981	181,300,000
Increase (Decrease) in Temporary Equity
Distributions to redeemable non-controlling interest	$ (517.2)			(517.2)
Fair value adjustment related to redeemable non-controlling interest	(4.1)	$ (0.8)		(3.3)	4.1
Net income (loss)	$ (33.4)	$ (13.2)		$ (20.2)	0.6
Redeemable noncontrolling interest, ending balance at Dec. 31, 2018					$ 9.3