Consolidated Statements of Changes in Members' Equity - USD ($) $ in Millions	Total	Common Units	Net Devon Investment	Accumulated Other Comprehensive Loss	Non-Controlling Interest	Redeemable Non-Controlling Interest (Temporary Equity)
Member equity, beginning balance at Dec. 31, 2014	$ 7,074.8	$ 2,774.3	$ 103.7		$ 4,196.8
Units outstanding, beginning balance (in shares) at Dec. 31, 2014		164,100,000
Increase (Decrease) in Members' Equity
Issuance of common units by ENLK	384.4				384.4
Conversion of restricted units for common units, net of units withheld for taxes	(2.9)	$ (2.9)
Conversion of restricted units for common units, net of units withheld for taxes (in shares)		100,000
Non-controlling interest’s impact of conversion of restricted units	(2.5)				(2.5)
Unit-based compensation	36.1	$ 18.5			17.6
Change in equity due to issuance of units by ENLK	(5.2)	8.5			(13.7)
Non-controlling interest distributions	(359.5)				(359.5)	$ 7.0
Non-controlling interest contribution	16.4				16.4
Distributions to members	(162.8)	(162.8)
Adjustment related to mandatory redemption of E2 non-controlling interest	(5.4)				(5.4)
Redeemable non-controlling interest	(7.0)				(7.0)
Contribution from Devon to ENLC	7.1	7.1
Contribution from Devon to ENLK	27.8		25.6		2.2
Distribution attributable to VEX interests transferred (Note 3)	(166.7)		(131.1)		(35.6)
Net income (loss)	(1,409.7)	(357.0)	1.8		(1,054.5)
Member equity, end balance at Dec. 31, 2015	5,424.9	$ 2,285.7	$ 0.0		3,139.2
Units outstanding, end balance (in shares) at Dec. 31, 2015		164,200,000
Redeemable noncontrolling interest, beginning balance at Dec. 31, 2014						0.0
Increase (Decrease) in Temporary Equity
Redeemable non-controlling interest	(359.5)				(359.5)	7.0
Redeemable noncontrolling interest, ending balance at Dec. 31, 2015						7.0
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 to members	(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	180,049,316	180,000,000
Increase (Decrease) in Temporary Equity
Redeemable non-controlling interest	$ (382.4)				(382.4)	(1.8)
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 to members	(186.0)	(186.0)
Contribution from Devon to ENLK	1.3				1.3
Loss on designated cash flow hedge	(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
Redeemable non-controlling interest	$ (433.1)				$ (433.1)	(0.6)
Redeemable noncontrolling interest, ending balance at Dec. 31, 2017						$ 4.6