Employee Incentive Plans - Restricted and Performance Awards (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended					12 Months Ended
	Jul. 23, 2018	Jul. 18, 2018	Mar. 31, 2018	Mar. 31, 2017	Oct. 31, 2016	Feb. 29, 2016	Jan. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
TSR price (in dollars per share)			$ 16.55	$ 18.29	$ 16.75	$ 15.38	$ 15.38
Risk-free interest rate			2.38%	1.62%	0.91%	0.89%	1.10%
Volatility factor			51.36%	52.07%	52.89%	52.05%	46.02%
Distribution yield			6.70%	5.40%	6.10%	14.00%	8.60%
Restricted incentive units
Number of Units
Non-vested, beginning of period (in shares)								1,889,310
Granted (in shares)								1,473,195
Vested (in shares)			(194,185.000000)					(769,848)
Forfeited (in shares)								(166,790)
Non-vested, end of period (in shares)								2,425,867	1,889,310
Aggregate intrinsic value, end of period (in millions)								$ 23.0
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share)								$ 16.33
Granted (in dollars per share)								15.76
Vested (in dollars per share)								21.40
Forfeited (in dollars per share)								12.74
Non-vested, end of period (in dollars per share)								$ 14.62	$ 16.33
Fair value of units vested			$ 3.0					$ 16.5	$ 22.2	$ 12.4
Units withheld for payroll taxes (in shares)								244,123
Aggregate intrinsic value of units vested								$ 12.8	$ 15.3	4.1
Unrecognized compensation cost related to non-vested restricted incentive units								$ 17.9
Unrecognized compensation costs, weighted average period for recognition								1 year 10 months
Performance Shares
Number of Units
Non-vested, beginning of period (in shares)								548,839
Granted (in shares)								223,865
Vested (in shares)		(120,250)						(283,637)
Forfeited (in shares)								(70,918)
Non-vested, end of period (in shares)								418,149	548,839
Aggregate intrinsic value, end of period (in millions)								$ 4.0
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)								27.25
Forfeited (in dollars per share)								17.75
Non-vested, end of period (in dollars per share)								$ 19.15	$ 22.14
Fair value of units vested								$ 7.7
Units withheld for payroll taxes (in shares)								112,101
Aggregate intrinsic value of units vested								$ 4.7
Unrecognized compensation cost related to non-vested restricted incentive units								$ 5.9
Unrecognized compensation costs, weighted average period for recognition								1 year 7 months
Vesting period								3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Employee Service Share-based Compensation, Nonvested Awards, Additional Compensation Cost Not yet Recognized								$ 2.1
Performance Shares | Minimum
Weighted Average Grant-Date Fair Value
Percent of units vesting	0.00%							0.00%
Performance Shares | Maximum
Weighted Average Grant-Date Fair Value
Percent of units vesting	100.00%							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)								1,590,100
Vested (in shares)			(200,753.000000)					(835,115)
Forfeited (in shares)								(178,939)
Non-vested, end of period (in shares)								2,556,270	1,980,224
Aggregate intrinsic value, end of period (in millions)								$ 28.1
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share)								$ 15.81
Granted (in dollars per share)								15.27
Vested (in dollars per share)								19.68
Forfeited (in dollars per share)								12.75
Non-vested, end of period (in dollars per share)								$ 14.43	$ 15.81
Fair value of units vested			$ 3.0					$ 16.4	$ 22.6	9.5
Units withheld for payroll taxes (in shares)								261,063
Aggregate intrinsic value of units vested								$ 13.1	$ 16.6	$ 4.1
Unrecognized compensation cost related to non-vested restricted incentive units								$ 18.4
Unrecognized compensation costs, weighted average period for recognition								1 year 10 months
EnLink Midstream Partners, LP | Performance Shares
Number of Units
Non-vested, beginning of period (in shares)								585,285
Granted (in shares)								256,345
Vested (in shares)								(313,610)
Forfeited (in shares)								(76,351)
Non-vested, end of period (in shares)								451,669	585,285
Aggregate intrinsic value, end of period (in millions)								$ 5.0
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)								24.43
Forfeited (in dollars per share)								16.62
Non-vested, end of period (in dollars per share)								$ 17.74	$ 20.52
Fair value of units vested								$ 7.7
Aggregate intrinsic value of units vested								5.0
Unrecognized compensation cost related to non-vested restricted incentive units								$ 6.1
Unrecognized compensation costs, weighted average period for recognition								1 year 8 months
Vesting period								3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
TSR price (in dollars per share)			$ 15.44	$ 17.55	$ 17.71	$ 14.82	$ 14.82
Risk-free interest rate			2.38%	1.62%	0.91%	0.89%	1.10%
Volatility factor			43.85%	43.94%	44.62%	42.33%	39.71%
Distribution yield			10.50%	8.70%	8.80%	19.20%	12.10%
Employee Service Share-based Compensation, Nonvested Awards, Additional Compensation Cost Not yet Recognized								$ 2.3
EnLink Midstream Partners, LP | Performance Shares | Minimum
Weighted Average Grant-Date Fair Value
Percent of units vesting								0.00%
EnLink Midstream Partners, LP | Performance Shares | Maximum
Weighted Average Grant-Date Fair Value
Percent of units vesting								200.00%
ENLC | Performance Shares
Number of Units
Vested (in shares)		(109,819,000,000)
Weighted Average Grant-Date Fair Value
Units withheld for payroll taxes (in shares)								100,109,000,000
ENLC | Performance Shares | Minimum
Weighted Average Grant-Date Fair Value
Percent of units vesting								0.00%
ENLC | Performance Shares | Maximum
Weighted Average Grant-Date Fair Value
Percent of units vesting	100.00%