Employee Incentive Plans - Restricted and Performance Awards (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Restricted incentive units
Number of Units
Non-vested, beginning of period (in shares)			1,889,310
Granted (in shares)			838,734
Vested (in shares)	(194,185)		(531,143)
Forfeited (in shares)			(114,795)
Non-vested, end of period (in shares)	2,082,106		2,082,106
Aggregate intrinsic value, end of period	$ 30.5		$ 30.5
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share)			$ 16.33
Granted (in dollars per share)			15.51
Vested (in dollars per share)			24.60
Forfeited (in dollars per share)			11.75
Non-vested, end of period (in dollars per share)	$ 14.14		$ 14.14
Fair value of units vested	$ 3.0		$ 13.1	$ 20.4
Units withheld for payroll taxes (in shares)			171,813
Aggregate intrinsic value of units vested			$ 8.9	14.3
Unrecognized compensation cost related to non-vested restricted incentive units	$ 18.7		$ 18.7
Unrecognized compensation costs, weighted average period for recognition			2 years 1 month
Vesting period			3 years
Performance units
Incentive Plans [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested			$ 1.9
Number of Units
Non-vested, beginning of period (in shares)			548,839
Granted (in shares)			223,865
Vested (in shares)			(102,555)
Forfeited (in shares)			(70,918)
Non-vested, end of period (in shares)	599,231		599,231
Aggregate intrinsic value, end of period	$ 8.8		$ 8.8
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share)			$ 22.14
Granted (in dollars per share)			21.63
Vested (in dollars per share)			40.48
Forfeited (in dollars per share)			17.75
Non-vested, end of period (in dollars per share)	$ 19.33		$ 19.33
Fair value of units vested			$ 4.2
Units withheld for payroll taxes (in shares)			28,846
Unrecognized compensation cost related to non-vested restricted incentive units	$ 8.3		$ 8.3
Unrecognized compensation costs, weighted average period for recognition			2 years 3 months
Vesting period			3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Beginning TSR Price (in dollars per share)		$ 16.55
Risk-free interest rate		2.38%
Volatility factor		51.36%
Distribution yield		6.70%
Performance units | Minimum
Weighted Average Grant-Date Fair Value
Percent of units vesting			0.00%
Performance units | Maximum
Weighted Average Grant-Date Fair Value
Percent of units vesting			200.00%
EnLink Midstream Partners, LP | Restricted incentive units
Number of Units
Non-vested, beginning of period (in shares)			1,980,224
Granted (in shares)			938,306
Vested (in shares)	(200,753)		(574,624)
Forfeited (in shares)			(124,301)
Non-vested, end of period (in shares)	2,219,605		2,219,605
Aggregate intrinsic value, end of period	$ 30.3		$ 30.3
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share)			$ 15.81
Granted (in dollars per share)			15.02
Vested (in dollars per share)			22.32
Forfeited (in dollars per share)			11.83
Non-vested, end of period (in dollars per share)	$ 13.97		$ 13.97
Fair value of units vested	$ 3.0		$ 12.8	20.5
Units withheld for payroll taxes (in shares)			181,959
Aggregate intrinsic value of units vested			$ 8.7	$ 15.3
Unrecognized compensation cost related to non-vested restricted incentive units	$ 19.9		$ 19.9
Unrecognized compensation costs, weighted average period for recognition			2 years 2 months
Vesting period			3 years
EnLink Midstream Partners, LP | Performance units
Incentive Plans [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested			$ 2.0
Number of Units
Non-vested, beginning of period (in shares)			585,285
Granted (in shares)			256,345
Vested (in shares)			(115,328)
Forfeited (in shares)			(76,351)
Non-vested, end of period (in shares)	649,951		649,951
Aggregate intrinsic value, end of period	$ 8.9		$ 8.9
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share)			$ 20.52
Granted (in dollars per share)			19.24
Vested (in dollars per share)			35.39
Forfeited (in dollars per share)			16.62
Non-vested, end of period (in dollars per share)	$ 17.83		$ 17.83
Fair value of units vested			$ 4.1
Units withheld for payroll taxes (in shares)			34,069
Unrecognized compensation cost related to non-vested restricted incentive units	$ 8.3		$ 8.3
Unrecognized compensation costs, weighted average period for recognition			2 years 3 months
Vesting period			3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Beginning TSR Price (in dollars per share)	$ 15.44
Risk-free interest rate	2.38%
Volatility factor	43.85%
Distribution yield	10.50%
EnLink Midstream Partners, LP | Performance units | Minimum
Weighted Average Grant-Date Fair Value
Percent of units vesting			0.00%
EnLink Midstream Partners, LP | Performance units | Maximum
Weighted Average Grant-Date Fair Value
Percent of units vesting			200.00%