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Equity-based Awards, Unit Option Awards (Details) (Unit Option Awards [Member], USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Unit Option Awards [Member]
          
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)     4,050,000 [1]    
Exercised (in units)     (2,720,000)    
Forfeited (in units)     (60,000)    
End of period (in units) 1,270,000 [1]   1,270,000 [1]   4,050,000 [1]
Options outstanding, weighted-average strike price [Roll Forward]          
Weighted average strike price, beginning of period (in dollars per unit)     $ 13.24    
Weighted average strike price, exercised (in dollars per unit)     $ 11.83    
Weighted average strike price, forfeited (in dollars per unit)     $ 16.14    
Weighted average strike price, end of period (in dollars per unit) $ 16.14   $ 16.14   $ 13.24
Weighted average remaining contractual term     1 year 3 months 18 days   1 year 3 months 18 days
Aggregate intrinsic value $ 30.7 [2]   $ 30.7 [2]   $ 57.0 [2]
Total intrinsic value of unit option awards exercised during period 0 0 57.5 19.8  
Cash received from EPCO in connection with the exercise of unit option awards 0 0 33.4 11.5  
Unit option award-related cash reimbursements to EPCO $ 0 $ 0 $ 57.5 $ 19.8  
[1] None of the unit option awards outstanding at September 30, 2014 and December 31, 2013 were exercisable as of such dates, respectively.
[2] Aggregate intrinsic value reflects fully vested unit option awards at the dates indicated.