Employee Incentive Plans - Restricted and Performance Awards (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2017	Mar. 31, 2016
Restricted incentive units
Number of Units
Non-vested, beginning of period (in shares)		1,897,298
Granted (in shares)		781,842
Vested (in shares)	(258,606.000000)	(726,692)
Forfeited (in shares)		(6,706)
Non-vested, end of period (in shares)	1,945,742	1,945,742
Aggregate intrinsic value, end of period	$ 37.7	$ 37.7
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share)		$ 19.96
Granted (in dollars per share)		19.29
Vested (in dollars per share)		28.07
Forfeited (in dollars per share)		17.58
Non-vested, end of period (in dollars per share)	$ 16.67	$ 16.67
Fair value of units vested	$ 5.0	$ 20.4	$ 11.8
Units withheld for payroll taxes (in shares)		224,709
Aggregate intrinsic value of units vested		$ 14.3	3.8
Unrecognized compensation cost related to non-vested restricted incentive units	$ 20.2	$ 20.2
Unrecognized compensation costs, weighted average period for recognition		2 years
Performance units
Number of Units
Non-vested, beginning of period (in shares)		384,264
Granted (in shares)		164,575
Forfeited (in shares)		0
Non-vested, end of period (in shares)	548,839	548,839
Aggregate intrinsic value, end of period	$ 10.6	$ 10.6
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share)		$ 19.30
Granted (in dollars per share)		28.77
Forfeited (in dollars per share)		0.00
Non-vested, end of period (in dollars per share)	$ 22.14	$ 22.14
Unrecognized compensation cost related to non-vested restricted incentive units	$ 8.1	$ 8.1
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		$ 18.29
Risk-free interest rate		1.62%
Volatility factor		52.07%
Distribution yield		5.40%
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)		2,024,820
Granted (in shares)		822,865
Vested (in shares)	(262,288.000000)	(795,188)
Forfeited (in shares)		(6,997)
Non-vested, end of period (in shares)	2,045,500	2,045,500
Aggregate intrinsic value, end of period	$ 37.4	$ 37.4
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share)		$ 19.05
Granted (in dollars per share)		18.46
Vested (in dollars per share)		25.84
Forfeited (in dollars per share)		16.87
Non-vested, end of period (in dollars per share)	$ 16.18	$ 16.18
Fair value of units vested	$ 5.1	$ 20.5	9.0
Units withheld for payroll taxes (in shares)		258,145
Aggregate intrinsic value of units vested		$ 15.3	$ 3.7
Unrecognized compensation cost related to non-vested restricted incentive units	$ 20.7	$ 20.7
Unrecognized compensation costs, weighted average period for recognition		2 years
EnLink Midstream Partners, LP | Performance units
Number of Units
Non-vested, beginning of period (in shares)		408,637
Granted (in shares)		176,648
Forfeited (in shares)		0
Non-vested, end of period (in shares)	585,285	585,285
Aggregate intrinsic value, end of period	$ 10.7	$ 10.7
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share)		$ 11.53
Granted (in dollars per share)		25.73
Forfeited (in dollars per share)		0.00
Non-vested, end of period (in dollars per share)	$ 15.82	$ 15.82
Unrecognized compensation cost related to non-vested restricted incentive units	$ 8.0	$ 8.0
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		$ 17.55
Risk-free interest rate		1.62%
Volatility factor		43.94%
Distribution yield		8.70%
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%