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Equity-based Awards, Unit Option Awards (Details) - Unit Option Awards [Member] - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 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) [1]     1,270,000  
Exercised (in units)     (1,080,000)  
End of period (in units) [1] 190,000   190,000  
Options outstanding, weighted-average strike price [Roll Forward]        
Weighted average strike price, beginning of period (in dollars per unit)     $ 16.14  
Weighted average strike price, exercised (in dollars per unit)     16.14  
Weighted average strike price, end of period (in dollars per unit) $ 16.14   $ 16.14  
Weighted average remaining contractual term     3 months 18 days  
Aggregate intrinsic value [2] $ 1.7   $ 1.7  
Total intrinsic value of unit option awards exercised during period 0.2 $ 0.0 19.8 $ 57.5
Cash received from EPCO in connection with the exercise of unit option awards 0.2 0.0 11.5 33.4
Unit option award-related cash reimbursements to EPCO $ 0.2 $ 0.0 $ 19.8 $ 57.5
[1] All of the unit option awards outstanding at September 30, 2015 were exercisable. None of the unit option awards outstanding at December 31, 2014 were exercisable.
[2] Aggregate intrinsic value reflects fully vested unit option awards at the dates indicated.