Certain Provisions of the Partnership Agreement - Allocation of Income (Details) - General Partner - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Incentive distribution
Income allocation for incentive distributions	$ 58.9	$ 56.8	$ 47.5
Unit-based compensation attributable to ENLC’s restricted units	(21.0)	(14.7)	(18.3)
General partner share of net income (loss)	0.4	(2.6)	(6.7)
General partner interest in drop down transactions	0.0	0.0	35.5
General partner interest in net income	$ 38.3	$ 39.5	$ 58.0