Consolidated Statement of Changes in Members' Equity - 6 months ended Jun. 30, 2018 - 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, 2017	$ 5,556.7	$ 1,924.2	$ (2.0)	$ 3,634.5
Units outstanding, beginning balance (in shares) at Dec. 31, 2017	180,600,728	180,600,000
Increase (Decrease) in Members' Equity
Issuance of common units by ENLK	$ 0.9			0.9
Conversion of restricted units for common units, net of units withheld for taxes	(3.5)	$ (3.5)
Conversion of restricted units for common units, net of units withheld for taxes (in shares)		500,000
Non-controlling interest’s impact of conversion of restricted units	(3.4)			(3.4)
Unit-based compensation	16.8	$ 8.4		8.4
Change in equity due to issuance of units by ENLK	0.6	(1.9)		2.5
Contributions from non-controlling interests	54.3			54.3
Distributions	(351.2)	(95.7)		(255.5)
Net income	159.3	40.4		118.9
Member equity, end balance at Jun. 30, 2018	$ 5,430.5	$ 1,871.9	$ (2.0)	$ 3,560.6
Units outstanding, end balance (in shares) at Jun. 30, 2018	181,051,875	181,100,000
Redeemable noncontrolling interest, beginning balance at Dec. 31, 2017					$ 4.6
Redeemable noncontrolling interest, ending balance at Jun. 30, 2018					$ 4.6