Employee Incentive Plans - Restricted and Performance Awards (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended					12 Months Ended
	Mar. 31, 2017	Oct. 31, 2016	Feb. 29, 2016	Jan. 31, 2016	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Beginning TSR price (in dollars per share)	$ 18.29	$ 16.75	$ 15.38	$ 15.38	$ 34.24
Risk-free interest rate	1.62%	0.91%	0.89%	1.10%	0.99%
Volatility factor	52.07%	52.89%	52.05%	46.02%	33.02%
Distribution yield	5.40%	6.10%	14.00%	8.60%	2.98%
Restricted incentive units
Number of Units
Non-vested, beginning of period (in shares)						1,897,298
Granted (in shares)						827,609
Vested (in shares)	(258,606.000000)					(795,032)
Forfeited (in shares)						(40,565)
Non-vested, end of period (in shares)						1,889,310	1,897,298
Aggregate intrinsic value, end of period (in millions)						$ 33.3
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share)						$ 19.96
Granted (in dollars per share)						19.20
Vested (in dollars per share)						27.95
Forfeited (in dollars per share)						16.84
Non-vested, end of period (in dollars per share)						$ 21.64	$ 19.96
Fair value of units vested	$ 5.0					$ 22.2	$ 12.4	$ 9.8
Units withheld for payroll taxes (in shares)						243,620
Aggregate intrinsic value of units vested						$ 15.3	$ 4.1	9.2
Unrecognized compensation cost related to non-vested restricted incentive units						$ 11.3
Unrecognized compensation costs, weighted average period for recognition						1 year 8 months
Performance Shares
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	384,264
Aggregate intrinsic value, end of period (in millions)						$ 9.7
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	$ 19.30
Unrecognized compensation cost related to non-vested restricted incentive units						$ 5.0
Unrecognized compensation costs, weighted average period for recognition						1 year 10 months
Vesting period						3 years
Performance Shares | Minimum
Weighted Average Grant-Date Fair Value
Percent of units vesting						0.00%
Performance Shares | 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)						870,088
Vested (in shares)	(262,288.000000)					(873,229)
Forfeited (in shares)						(41,455)
Non-vested, end of period (in shares)						1,980,224	2,024,820
Aggregate intrinsic value, end of period (in millions)						$ 30.4
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share)						$ 19.05
Granted (in dollars per share)						18.38
Vested (in dollars per share)						25.85
Forfeited (in dollars per share)						16.53
Non-vested, end of period (in dollars per share)						$ 15.81	$ 19.05
Fair value of units vested	$ 5.1					$ 22.6	$ 9.5	8.1
Units withheld for payroll taxes (in shares)						279,827
Aggregate intrinsic value of units vested						$ 16.6	$ 4.1	$ 7.5
Unrecognized compensation cost related to non-vested restricted incentive units						$ 11.6
Unrecognized compensation costs, weighted average period for recognition						1 year 8 months
EnLink Midstream Partners, LP | Performance Shares
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	408,637
Aggregate intrinsic value, end of period (in millions)						$ 9.0
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share)						$ 18.27
Granted (in dollars per share)						25.73
Forfeited (in dollars per share)						0.00
Non-vested, end of period (in dollars per share)						$ 20.52	$ 18.27
Unrecognized compensation cost related to non-vested restricted incentive units						$ 4.8
Unrecognized compensation costs, weighted average period for recognition						1 year 10 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)	$ 17.55	$ 17.71	$ 14.82	$ 14.82	$ 27.68
Risk-free interest rate	1.62%	0.91%	0.89%	1.10%	0.99%
Volatility factor	43.94%	44.62%	42.33%	39.71%	33.01%
Distribution yield	8.70%	8.80%	19.20%	12.10%	5.66%
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%