Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 102.2	$ 27.1	$ 159.3	$ 36.4
Loss on designated cash flow hedge, net of tax benefit of $0.2 million for the three and six months ended June 30, 2017	0.0	(2.0)	0.0	(2.0)
Comprehensive income	102.2	25.1	159.3	34.4
Comprehensive income attributable to non-controlling interest	74.2	19.6	118.9	30.8
Comprehensive income attributable to EnLink Midstream, LLC	$ 28.0	$ 5.5	$ 40.4	$ 3.6