Certain Provisions of the ENLK Partnership Agreement - Narrative and Distributions (Details) - USD ($) $ in Millions	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
Series B Preferred Unitholders
Partnership agreement
Distribution paid-in kind (in shares)	151,626	151,248	150,871	150,494	150,119	149,745	149,371	148,999
Cash distributions	$ 17.1	$ 17.0	$ 17.0	$ 16.9	$ 16.9	$ 16.8	$ 16.8	$ 16.8
Series B Preferred Unitholders | EnLink Midstream Partners, LP
Partnership agreement
Preferred units, issued (in shares)	60,650,397			60,197,784					60,650,397
Preferred units, outstanding (in shares)	60,650,397			60,197,784					60,650,397
Series C Preferred Unitholders
Partnership agreement
Distribution paid-in kind (in shares)	12,000,000				12,000,000				12,000,000	12,000,000
Series C Preferred Unitholders | EnLink Midstream Partners, LP
Partnership agreement
Preferred units, issued (in shares)	400,000			400,000					400,000
Preferred units, outstanding (in shares)	400,000			400,000					400,000