Goodwill and Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill
Goodwill, Beginning Balance	$ 2,413.9	$ 3,684.7
Impairment	(873.3)	(1,328.2)
Goodwill, Ending Balance	1,542.2	2,413.9
EnLink Midstream Partners, LP
Goodwill
Goodwill, Beginning Balance	2,413.9	3,684.7
Acquisitions		57.4
Impairment	(873.3)	(1,328.2)
Acquisition adjustment	1.6
Goodwill, Ending Balance	1,542.2	2,413.9
Operating Segments | Texas Operating Segment
Goodwill
Goodwill, Beginning Balance	703.5	1,168.2
Goodwill, Ending Balance	232.0	703.5
Operating Segments | Louisiana Operating Segment
Goodwill
Goodwill, Beginning Balance		786.8
Operating Segments | Oklahoma Operating Segment
Goodwill
Goodwill, Beginning Balance	190.3	190.3
Goodwill, Ending Balance	190.3	190.3
Operating Segments | Crude And Condensate Segment
Goodwill
Goodwill, Beginning Balance	93.2	112.5
Goodwill, Ending Balance		93.2
Operating Segments | EnLink Midstream Partners, LP | Texas Operating Segment
Goodwill
Goodwill, Beginning Balance	703.5	1,168.2
Acquisitions		27.8
Impairment	(473.1)	(492.5)
Acquisition adjustment	1.6
Goodwill, Ending Balance	232.0	703.5
Operating Segments | EnLink Midstream Partners, LP | Louisiana Operating Segment
Goodwill
Goodwill, Beginning Balance		786.8
Impairment		(786.8)
Operating Segments | EnLink Midstream Partners, LP | Oklahoma Operating Segment
Goodwill
Goodwill, Beginning Balance	190.3	190.3
Goodwill, Ending Balance	190.3	190.3
Operating Segments | EnLink Midstream Partners, LP | Crude And Condensate Segment
Goodwill
Goodwill, Beginning Balance	93.2	112.5
Acquisitions		29.6
Impairment	(93.2)	(48.9)
Goodwill, Ending Balance		93.2
Corporate, Non-Segment
Goodwill
Goodwill, Beginning Balance	1,426.9	1,426.9
Goodwill, Ending Balance	1,119.9	1,426.9
Corporate, Non-Segment | EnLink Midstream Partners, LP
Goodwill
Goodwill, Beginning Balance	1,426.9	1,427.0
Impairment	(307.0)
Goodwill, Ending Balance	$ 1,119.9	$ 1,426.9