Earnings per Unit and Dilution Computations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Enlink Midstream, LLC interest in net income (loss)													$ (460.0)	$ (357.0)	$ 90.5
Total distributed earnings													185.5	166.1	127.6
Total undistributed loss													$ (645.5)	$ (523.1)	$ (37.1)
Basic common unit (usd per unit)	$ (0.02)		$ 0.01	$ (2.56)	$ (1.18)	$ (1.18)	$ 0.09	$ 0.10					$ (2.56)	$ (2.17)	$ 0.55
Diluted common unit (usd per unit)	(0.02)		0.01	(2.56)	(1.18)	(1.18)	0.09	0.10					$ (2.56)	$ (2.17)	$ 0.55
Distribution declared (usd per unit)	$ 0.255
Distribution paid (usd per unit)		$ 0.255	$ 0.255	$ 0.255	$ 0.255	$ 0.255	$ 0.250	$ 0.245	$ 0.235	$ 0.230	$ 0.220	$ 0.180
Restricted Stock Units (RSUs)
Enlink Midstream, LLC interest in net income (loss)													$ (5.4)	$ (2.5)	$ 0.6
Total distributed earnings													2.2	1.1	0.8
Total undistributed loss													(7.5)	(3.6)	(0.2)
Common Unit
Enlink Midstream, LLC interest in net income (loss)													(454.6)	(354.5)	89.9
Total distributed earnings													183.3	165.0	126.8
Total undistributed loss													$ (638.0)	$ (519.5)	$ (36.9)