Earnings Per Unit and Dilution Computations - Computation and Distribution Activity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
EnLink Midstream, LLC interest in net loss	$ (1.9)		$ (457.6)
Distributed earnings allocated to:
Total distributed earnings	46.5		46.1
Undistributed loss allocated to:
Total undistributed loss	(48.4)		(503.7)
Net loss allocated to:
Total net loss	$ (1.9)		$ (457.6)
Basic and diluted net loss per unit:
Basic (in dollars per share)	$ (0.01)		$ (2.56)
Diluted common unit (in dollars per share)	(0.01)		(2.56)
Declared distribution (in dollars per share)	$ 0.255	$ 0.255	$ 0.255	$ 0.255
Unvested restricted units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
EnLink Midstream, LLC interest in net loss	$ 0.0		$ (4.7)
Distributed earnings allocated to:
Total distributed earnings	0.6		0.5
Undistributed loss allocated to:
Total undistributed loss	(0.6)		(5.2)
Net loss allocated to:
Total net loss	0.0		(4.7)
Common units
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
EnLink Midstream, LLC interest in net loss	(1.9)		(452.9)
Distributed earnings allocated to:
Total distributed earnings	45.9		45.6
Undistributed loss allocated to:
Total undistributed loss	(47.8)		(498.5)
Net loss allocated to:
Total net loss	$ (1.9)		$ (452.9)