Members' Equity - Computation and Distribution Activity (Details) - USD ($)	3 Months Ended								9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Nov. 30, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Repurchase program, amount authorized											$ 100,000,000
Common units repurchased (in shares)	2,076,545								2,394,296
Payment for common unit repurchases	$ 12,500,000								$ 14,500,000	$ 0
Shares repurchased, average cost per share (in dollars per share)	$ 6.02								$ 6.05
Distributed earnings allocated to:
Total distributed earnings	$ 46,800,000				$ 46,600,000				$ 140,900,000	139,900,000
Undistributed loss allocated to:
Total undistributed loss, basic	(44,900,000)				(34,000,000.0)				(173,300,000)	(410,000,000.0)
Total undistributed loss, diluted	(44,900,000)				(34,000,000.0)				(173,300,000)	(410,000,000.0)
Net income (loss) attributable to ENLC allocated to:
Total net income (loss), basic	1,900,000				12,600,000				(32,400,000)	(270,100,000)
Total net income (loss), diluted	$ 1,900,000				$ 12,600,000				$ (32,400,000)	$ (270,100,000)
Basic and diluted total net income (loss) attributable to ENLC per unit:
Basic (in dollars per share)	$ 0				$ 0.03				$ (0.07)	$ (0.55)
Diluted (in dollars per share)	0				0.03				$ (0.07)	$ (0.55)
Distribution declared/unit (in dollars per share)	$ 0.09375	$ 0.09375	$ 0.09375	$ 0.09375	$ 0.09375	$ 0.09375	$ 0.09375	$ 0.1875
Unvested restricted units
Distributed earnings allocated to:
Total distributed earnings	$ 1,000,000.0				$ 700,000				$ 3,200,000	$ 2,300,000
Undistributed loss allocated to:
Total undistributed loss, basic	(1,000,000.0)				(600,000)				(4,000,000.0)	(7,000,000.0)
Total undistributed loss, diluted	(1,000,000.0)				(600,000)				(4,000,000.0)	(7,000,000.0)
Net income (loss) attributable to ENLC allocated to:
Total net income (loss), basic	0				100,000				(800,000)	(4,700,000)
Total net income (loss), diluted	0				100,000				(800,000)	(4,700,000)
Common units
Distributed earnings allocated to:
Total distributed earnings	45,800,000				45,900,000				137,700,000	137,600,000
Undistributed loss allocated to:
Total undistributed loss, basic	(43,900,000)				(33,400,000)				(169,300,000)	(403,000,000.0)
Total undistributed loss, diluted	(43,900,000)				(33,400,000)				(169,300,000)	(403,000,000.0)
Net income (loss) attributable to ENLC allocated to:
Total net income (loss), basic	1,900,000				12,500,000				(31,600,000)	(265,400,000)
Total net income (loss), diluted	$ 1,900,000				$ 12,500,000				$ (31,600,000)	$ (265,400,000)