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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Summary of awards activity, options [Roll Forward]          
Beginning of period (in units)     2,761,140    
Exercised (in units)     (736,140)    
End of period (in units) 2,025,000   2,025,000   2,761,140
Options outstanding, weighted-average strike price [Roll Forward]          
Weighted average strike price, beginning of period (in dollars per unit)     $ 27.41    
Weighted average strike price, exercised (in dollars per unit)     $ 29.95    
Weighted average strike price, end of period (in dollars per unit) $ 26.49   $ 26.49   $ 27.41
Weighted average remaining contractual term     1 year 10 months   2 years
Aggregate intrinsic value $ 51.4 [1]   $ 51.4 [1]   $ 13.0 [1]
Exercisable (in units) 0   0    
Exercisable - Weighted average strike price (in dollars per unit) $ 0   $ 0    
Exercisable - Weighted average remaining contractual term (in years)     0 years    
Exercisable - Aggregate intrinsic value 0 [1]   0 [1]    
Total intrinsic value of unit option awards exercised during period 3.4 0 19.8 14.0  
Cash received from EPCO in connection with the exercise of unit option awards 2.0 0 11.5 10.2  
Unit option award-related cash reimbursements to EPCO 3.4 0 19.8 14.0  
Unrecognized Compensation Expense [Abstract]          
Unrecognized compensation cost 0.3   0.3    
Recognition period for total unrecognized compensation cost     0 years 7 months    
Enterprise [Member]
          
Unrecognized Compensation Expense [Abstract]          
Unrecognized compensation cost $ 0.3   $ 0.3    
[1] Aggregate intrinsic value reflects fully vested unit option awards at the date indicated.