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Equity-based Awards, Unit Option Awards (Details) (Unit Option Awards [Member], USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
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) 2,761,140 [1],[2] 3,753,420  
Exercised (in units) (736,140) (742,280)  
Forfeited (in units)   (250,000)  
End of period (in units) 2,025,000 [1],[2] 2,761,140 [1],[2] 3,753,420
Options outstanding, weighted-average strike price [Roll Forward]      
Weighted average strike price, beginning of period (in dollars per unit) $ 27.41 [1],[2] $ 28.08  
Weighted average strike price, exercised (in dollars per unit) $ 29.95 $ 30.77  
Weighted average strike price, forfeited (in dollars per unit)   $ 27.45  
Weighted average strike price, end of period (in dollars per unit) $ 26.49 [1],[2] $ 27.41 [1],[2] $ 28.08
Weighted average remaining contractual term 1 year 3 months 18 days    
Aggregate intrinsic value $ 57.0 [1],[2],[3]    
Exercisable (in units) 0 0 0
Option awards vested during period (in units) 1,330,000    
Awards exercisable in 2014 (in units) 1,330,000    
Option awards vested in 2014 695,000    
Awards exercisable in 2015 (in units) 695,000    
Total intrinsic value of unit option awards exercised during period 19.8 14.6 0
Cash received from EPCO in connection with the exercise of unit option awards 11.5 10.2 0
Unit option-related cash reimbursements to EPCO 19.8 14.0 0
Unrecognized Compensation Expense [Abstract]      
Unrecognized compensation cost $ 0.1    
[1] At December 31, 2013 and 2012, we were committed to issue 2,025,000 and 2,761,140, respectively, of our common units if all outstanding unit option awards were exercised. Option awards outstanding at December 31, 2013 include 1,330,000 awards that vested during 2013 and became exercisable beginning in February 2014. Of the remaining outstanding option awards at December 31, 2013, 695,000 will vest in 2014 and become exercisable in 2015.
[2] None of the unit option awards outstanding at December 31, 2013, 2012 and 2011 were exercisable.
[3] Aggregate intrinsic value reflects fully vested unit option awards at the date indicated.