Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 1,064.3	$ 928.5	$ 744.9	$ 1,156.1	$ 1,155.7	$ 1,408.0	$ 1,710.0	$ 1,779.2	$ 2,058.3	$ 2,114.3	$ 1,764.7	$ 1,761.7	$ 3,893.8	$ 6,052.9	$ 7,699.0
Impairments	8.3	0.0	1.5	353.0	947.0	0.0	0.0	186.5	341.2	24.6	0.0	0.0	362.8	1,133.5	365.8
Operating income (loss)	92.3	100.5	70.7	(245.5)	(821.7)	96.5	53.1	(88.7)	(190.1)	89.8	148.8	105.3	18.0	(760.8)	153.8
Net income attributable to non-controlling interest	27.2	26.6	25.7	26.4	27.3	25.7	25.2	41.5	(175.8)	37.3	74.2	44.7	105.9	119.7	(19.6)
Net income (loss) attributable to ENLC	$ (151.4)	$ 12.6	$ 4.1	$ (286.8)	$ (938.7)	$ 11.8	$ (16.1)	$ (176.3)	$ (61.3)	$ 7.7	$ 28.0	$ 12.4	$ (421.5)	$ (1,119.3)	$ (13.2)
Net income (loss) attributable to ENLC per unit:
Basic common unit (in dollars per share)	$ (0.31)	$ 0.03	$ 0.01	$ (0.59)	$ (1.92)	$ 0.02	$ (0.03)	$ (0.45)	$ (0.34)	$ 0.04	$ 0.15	$ 0.07	$ (0.86)	$ (2.41)	$ (0.07)
Diluted common unit (in dollars per share)	$ (0.31)	$ 0.03	$ 0.01	$ (0.59)	$ (1.92)	$ 0.02	$ (0.03)	$ (0.45)	$ (0.34)	$ 0.04	$ 0.15	$ 0.07	$ (0.86)	$ (2.41)	$ (0.07)