Goodwill and Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment loss recognized	$ 232,000,000	$ 873,300,000
Impairment of intangible assets		$ 0
Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life			5 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life			20 years
Weighted average
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life			14 years 11 months 20 days
EnLink Midstream Partners, LP
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment loss recognized			$ 232,000,000
Tangible asset impairment charges				$ 17,100,000
Amortization expense			123,500,000	$ 127,100,000	$ 117,000,000
Crude and Condensate
Finite-Lived Intangible Assets [Line Items]
Tangible asset impairment charges			$ 109,200,000