Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 2,058.3	$ 2,114.3	$ 1,764.7	$ 1,761.7	$ 1,756.2	$ 1,397.9	$ 1,263.6	$ 1,321.9	$ 1,224.9	$ 1,104.6	$ 1,033.2	$ 889.7	$ 7,699.0	$ 5,739.6	$ 4,252.4
Impairments	341.2	24.6	0.0	0.0	8.3	1.8	0.0	7.0	0.0	0.0	0.0	873.3	365.8	17.1	873.3
Operating income (loss)	(190.1)	89.8	148.8	105.3	96.9	72.1	68.9	56.5	39.2	65.9	45.2	(824.8)	153.8	294.4	(674.5)
Net income (loss) attributable to non-controlling interest	(175.8)	37.3	74.2	44.7	56.9	17.9	21.2	11.2	(25.3)	10.4	0.4	(413.7)	(19.6)	107.2	(428.2)
Net income (loss) attributable to ENLC	$ (61.3)	$ 7.7	$ 28.0	$ 12.4	$ 202.6	$ 6.2	$ 5.9	$ (1.9)	$ (3.9)	$ 0.7	$ 0.8	$ (457.6)	$ (13.2)	$ 212.8	$ (460.0)
Net income (loss) attributable to ENLC per unit:
Basic common unit (in dollars per share)	$ (0.34)	$ 0.04	$ 0.15	$ 0.07	$ 1.12	$ 0.03	$ 0.03	$ (0.01)	$ (0.02)	$ 0.00	$ 0.01	$ (2.56)	$ (0.07)	$ 1.18	$ (2.56)
Diluted common unit (in dollars per share)	$ (0.34)	$ 0.04	$ 0.15	$ 0.07	$ 1.11	$ 0.03	$ 0.03	$ (0.01)	$ (0.02)	$ 0.00	$ 0.01	$ (2.56)	$ (0.07)	$ 1.17	$ (2.56)