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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 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 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)     2,025,000 [1]    
Exercised (in units)     (1,360,000)    
Forfeited (in units)     (30,000)    
End of period (in units) 635,000 [1]   635,000 [1]   2,025,000 [1]
Options outstanding, weighted-average strike price [Roll Forward]          
Weighted average strike price, beginning of period (in dollars per unit)     $ 26.49    
Weighted average strike price, exercised (in dollars per unit)     $ 23.66    
Weighted average strike price, forfeited (in dollars per unit)     $ 32.27    
Weighted average strike price, end of period (in dollars per unit) $ 32.27   $ 32.27   $ 26.49
Weighted average remaining contractual term     1 year 6 months   1 year 3 months 18 days
Aggregate intrinsic value $ 29.2 [2]   $ 29.2 [2]   $ 57.0 [2]
Total intrinsic value of unit option awards exercised during period 2.8 3.4 57.5 19.8  
Cash received from EPCO in connection with the exercise of unit option awards 1.6 2.0 33.4 11.5  
Unit option award-related cash reimbursements to EPCO $ 2.8 $ 3.4 $ 57.5 $ 19.8  
[1] None of the unit option awards outstanding at June 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 date indicated.