Members' Equity - Computation and Distribution Activity (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended
	Feb. 22, 2019	Jan. 25, 2019	May 15, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Business acquisition, equity interest issued or issuable, number of shares (in shares)		304,822,035
ENLC interest in net income	$ 400.0
Distributed earnings allocated to:
Total distributed earnings				$ 110.6		$ 48.1
Undistributed loss allocated to:
Total undistributed loss				(286.9)		(35.7)
Net income (loss) allocated to:
Total net income (loss)				$ (176.3)		$ 12.4
Basic and diluted net income (loss) per unit:
Basic (in dollars per share)				$ (0.45)		$ 0.07
Diluted (in dollars per share)				(0.45)		0.07
Distribution declared/unit (in dollars per share)				$ 0.279	$ 0.275	$ 0.263	$ 0.259
Distribution paid per unit (in dollars per share)			$ 0.263000000
Unvested restricted units
Distributed earnings allocated to:
Total distributed earnings				$ 1.2		$ 0.5
Undistributed loss allocated to:
Total undistributed loss				(3.1)		(0.4)
Net income (loss) allocated to:
Total net income (loss)				(1.9)		0.1
Common units
Distributed earnings allocated to:
Total distributed earnings				109.4		47.6
Undistributed loss allocated to:
Total undistributed loss				(283.8)		(35.3)
Net income (loss) allocated to:
Total net income (loss)				$ (174.4)		$ 12.3