Certain Provisions of the Partnership agreement (Partners' Capital) (Allocated Net Income (loss) to the General Partner) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014
Incentive Distribution Made to Managing Member or General Partner [Line Items]
Income allocation for incentive distributions	$ 5.9	$ 7.3
Unit-based compensation attributable to ENLC's restricted units	(3.1)	(3.7)
General Partner interest in net income	0.3	0.4
General Partner share of net income	$ 3.1	$ 4.0