Employee Incentive Plans - Restricted and Performance Awards (Details) $ / shares in Units, $ in Millions				1 Months Ended	3 Months Ended
	Jan. 25, 2019	Jul. 23, 2018	Jul. 18, 2018 shares	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) shares
Weighted Average Grant-Date Fair Value
Common units conversion ratio	1.15
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Beginning TSR Price (in dollars per share) | $ / shares					$ 10.92
Risk-free interest rate					2.42%
Volatility factor					33.86%
Distribution yield					9.70%
EnLink Midstream Partners, LP
Weighted Average Grant-Date Fair Value
Common units conversion ratio					1.15
Restricted incentive units
Number of Units
Non-vested, beginning of period (in shares)					2,425,867
Granted (in shares)				420,842	1,770,170
Vested (in shares)					(1,214,354)
Forfeited (in shares)					(54,090)
Converted to ENLC (in shares)					2,103,266
Non-vested, end of period (in shares)				5,030,859	5,030,859
Aggregate intrinsic value, end of period | $				$ 64.3	$ 64.3
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share) | $ / shares					$ 14.62
Granted (in dollars per share) | $ / shares					11.45
Vested (in dollars per share) | $ / shares					10.35
Forfeited (in dollars per share) | $ / shares					11.71
Converted to ENLC (in dollars per share) | $ / shares					10.59
Non-vested, end of period (in dollars per share) | $ / shares				$ 12.88	$ 12.88
Units withheld for payroll taxes (in shares)					409,384
Aggregate intrinsic value of units vested | $					$ 12.4	$ 8.9
Fair value of units vested | $				$ 4.8	$ 12.6	13.1
Vesting period					3 years
Unrecognized compensation cost related to non-vested restricted incentive units | $				$ 44.6	$ 44.6
Unrecognized compensation costs, weighted average period for recognition					2 years
Restricted incentive units | EnLink Midstream Partners, LP
Number of Units
Non-vested, beginning of period (in shares)					2,556,270
Vested (in shares)					(722,853)
Forfeited (in shares)					(4,490)
Converted to ENLC (in shares)					(1,828,927)
Non-vested, end of period (in shares)				0	0
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share) | $ / shares					$ 14.43
Vested (in dollars per share) | $ / shares					10.02
Forfeited (in dollars per share) | $ / shares					11.93
Converted to ENLC (in dollars per share) | $ / shares					12.18
Non-vested, end of period (in dollars per share) | $ / shares				$ 0.00	$ 0.00
Units withheld for payroll taxes (in shares)					249,201
Common units conversion ratio					1.15
Aggregate intrinsic value of units vested | $					$ 8.0	8.7
Fair value of units vested | $					$ 7.2	$ 12.8
Vesting period					3 years
Unrecognized compensation cost related to non-vested restricted incentive units | $				$ 0.0	$ 0.0
Unrecognized compensation costs, weighted average period for recognition					1 year
Performance units
Number of Units
Non-vested, beginning of period (in shares)					418,149
Granted (in shares)					907,337
Vested (in shares)			0		(161,286)	0
Converted to ENLC (in shares)					333,798
Non-vested, end of period (in shares)				1,497,998	1,497,998
Aggregate intrinsic value, end of period | $				$ 19.1	$ 19.1
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share) | $ / shares					$ 19.15
Granted (in dollars per share) | $ / shares					13.53
Vested (in dollars per share) | $ / shares					11.71
Converted to ENLC (in dollars per share) | $ / shares					22.47
Non-vested, end of period (in dollars per share) | $ / shares				$ 17.29	$ 17.29
Units withheld for payroll taxes (in shares)					62,219
Aggregate intrinsic value of units vested | $					$ 1.8	$ 1.9
Fair value of units vested | $					$ 1.9	$ 4.2
Vesting period					3 years
Unrecognized compensation cost related to non-vested restricted incentive units | $				$ 16.6	$ 16.6
Unrecognized compensation costs, weighted average period for recognition					2 years 2 months
Compensation expense not yet recognized | $				$ 2.3	$ 2.3
Performance units | Minimum
Weighted Average Grant-Date Fair Value
Percent of units vesting		0.00%			0.00%
Performance units | Maximum
Weighted Average Grant-Date Fair Value
Percent of units vesting		100.00%			200.00%
Performance units | EnLink Midstream Partners, LP
Number of Units
Non-vested, beginning of period (in shares)					451,669
Vested (in shares)					(161,410)	0
Converted to ENLC (in shares)					(290,259)
Non-vested, end of period (in shares)				0	0
Weighted Average Grant-Date Fair Value
Non-vested, beginning of period (in dollars per share) | $ / shares					$ 17.74
Vested (in dollars per share) | $ / shares					10.54
Converted to ENLC (in dollars per share) | $ / shares					25.84
Non-vested, end of period (in dollars per share) | $ / shares				$ 0.00	$ 0.00
Units withheld for payroll taxes (in shares)					62,403
Common units conversion ratio					1.15
Aggregate intrinsic value of units vested | $					$ 2.1	$ 2.0
Fair value of units vested | $					$ 1.7	$ 4.1
Vesting period					3 years
Unrecognized compensation cost related to non-vested restricted incentive units | $				$ 0.0	$ 0.0
Unrecognized compensation costs, weighted average period for recognition					1 year
Performance units | EnLink Midstream Partners, LP | Minimum
Weighted Average Grant-Date Fair Value
Percent of units vesting					0.00%
Performance units | EnLink Midstream Partners, LP | Maximum
Weighted Average Grant-Date Fair Value
Percent of units vesting					200.00%
ENLC Performance Shares
Weighted Average Grant-Date Fair Value
Compensation expense not yet recognized | $				2.1	$ 2.1
Legacy ENLK Performance Awards
Weighted Average Grant-Date Fair Value
Compensation expense not yet recognized | $				$ 0.7	$ 0.7