Certain Provisions of the Partnership Agreement - Allocation of Income (Details) - General Partner - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Incentive distribution
Income allocation for incentive distributions	$ 14.8	$ 14.6	$ 29.6	$ 29.3
Unit-based compensation attributable to ENLC’s restricted units	(4.0)	(3.9)	(8.4)	(12.7)
General Partner share of net income	0.4	0.1	0.6	0.1
General Partner interest in net income	$ 11.2	$ 10.8	$ 21.8	$ 16.7