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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 12 Months Ended
Mar. 31, 2014
Mar. 31, 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    
Exercised (in units) (1,300,000)    
Forfeited (in units) (30,000)    
End of period (in units) 695,000   2,025,000
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) $ 23.43    
Weighted average strike price, forfeited (in dollars per unit) $ 32.27    
Weighted average strike price, end of period (in dollars per unit) $ 31.95   $ 26.49
Weighted average remaining contractual term 1 year 8 months 12 days   1 year 3 months 18 days
Aggregate intrinsic value $ 26.0 [1]   $ 57.0 [1]
Exercisable (in units) 30,000    
Exercisable - Weighted average strike price (in dollars per unit) $ 24.92    
Exercisable - Weighted average remaining contractual term (in years) 9 months 18 days    
Exercisable - Aggregate intrinsic value 1.3 [1]    
Total intrinsic value of unit option awards exercised during period 54.7 16.4  
Cash received from EPCO in connection with the exercise of unit option awards 31.8 9.5  
Unit option award-related cash reimbursements to EPCO $ 54.7 $ 16.4  
[1] Aggregate intrinsic value reflects fully vested unit option awards at the date indicated.