Income Taxes - Book Income Reconciliation To Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Expected income tax benefit (expense) based on federal statutory tax rate (1)	$ 233.6	$ (1.0)	$ (5.6)
State income tax benefit (expense), net of federal benefit	27.0	(0.1)	(0.4)
Statutory rate change	0.0	0.0	210.6
Non-deductible expense related to impairments	(264.5)	(10.7)	0.0
Other	(3.0)	(6.4)	(7.8)
Total income tax benefit (expense)	(6.9)	(18.2)	$ 196.8
Deferred tax liabilities, net		$ 362.4
ENLC
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Deferred tax liabilities, net	185.7
EnLink Midstream Partners, LP
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Deferred tax liabilities, net	$ 24.9