Subsequent Event (Details) - USD ($)		3 Months Ended
	Apr. 09, 2019	Mar. 31, 2019	Mar. 31, 2018	Apr. 30, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Proceeds from borrowings		$ 630,000,000	$ 800,500,000
Secured term loan receivable from contract restructuring, net of discount of $0.8 and $1.1		23,200,000			$ 19,400,000
Subsequent Event
Subsequent Event [Line Items]
Proceeds from borrowings	$ 496,500,000
Secured term loan receivable from contract restructuring, net of discount of $0.8 and $1.1				$ 58,000,000
Debt instrument, total principal payments to be received over multiple installments				$ 9,750,000
2.7% Senior Notes due 2019
Subsequent Event [Line Items]
Face amount		$ 400,000,000.0
Stated interest rate		2.70%
Unsecured Debt | Term Loan Due 2029 | Subsequent Event
Subsequent Event [Line Items]
Face amount	$ 500,000,000
Stated interest rate	5.375%
Debt instrument, percentage price of debt issued	100.00%
EnLink Midstream Partners, LP | Carrying Value
Subsequent Event [Line Items]
Secured term loan receivable		$ 52,500,000			$ 51,100,000