Equity-Based Awards, Unit Option Awards (Details) - Unit Option Awards [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	4 years
Summary of awards activity, options [Roll Forward]
Beginning of period (in units)	0	1,270,000	4,050,000
Exercised (in units)		(1,270,000)	(2,720,000)
Forfeited (in units)			(60,000)
End of period (in units)		0	1,270,000
Options outstanding, weighted-average strike price [Roll Forward]
Weighted average strike price, beginning of period (in dollars per unit)	$ 0	$ 16.14	$ 13.24
Weighted average strike price, exercised (in dollars per unit)		16.14	11.83
Weighted average strike price, forfeited (in dollars per unit)			16.14
Weighted average strike price, end of period (in dollars per unit)		$ 0	$ 16.14
Total intrinsic value of unit option awards exercised during period		$ 21.7	$ 57.5
Cash received from EPCO in connection with the exercise of unit option awards		13.1	33.4
Unit option award-related cash reimbursements to EPCO		$ 21.7	$ 57.5