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Equity-based Awards, Phantom Unit Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Cash payments made in connection with DERs     $ 3.4 $ 1.2
Phantom Unit Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting rate of phantom unit awards (in hundredths) 25.00%   25.00%  
Summary of awards activity, equity instruments other than options [Roll Forward]        
Beginning of period (in units)     3,342,390  
Granted (in units) [1]     3,449,240  
Vested (in units)     (846,990)  
Forfeited (in units)     (133,334)  
End of period (in units) 5,811,306   5,811,306  
Phantom units outstanding, weighted-average grant date fair value [Roll Forward]        
Weighted-average grant date fair value per unit, at beginning of period (in dollars per unit) [2]     $ 33.13  
Granted weighted-average grant date fair value per unit (in dollars per unit) [1],[2]     34.05  
Vested weighted-average grant date fair value per unit (in dollars per unit) [2]     33.08  
Forfeited weighted-average grant date fair value per unit (in dollars per unit) [2]     33.40  
Weighted-average grant date fair value per unit, at end of period (in dollars per unit) [2] $ 33.67   $ 33.67  
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Aggregate grant date fair value     $ 117.4  
Estimated forfeiture rate (in hundredths)     3.50%  
Cash payments made in connection with DERs $ 2.2 $ 1.2 $ 3.4 1.2
Total intrinsic value of phantom unit awards that vested during period 2.1 $ 1.2 28.7 $ 1.2
Unrecognized Compensation Expense [Abstract]        
Unrecognized compensation cost 123.3   $ 123.3  
Recognition period for total unrecognized compensation cost     2 years 1 month 6 days  
Phantom Unit Awards [Member] | Minimum [Member]        
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Grant date market price of common units (in dollars per unit)     $ 33.72  
Phantom Unit Awards [Member] | Maximum [Member]        
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Grant date market price of common units (in dollars per unit)     $ 34.40  
Phantom Unit Awards [Member] | Enterprise [Member]        
Unrecognized Compensation Expense [Abstract]        
Unrecognized compensation cost $ 113.7   $ 113.7  
[1] The aggregate grant date fair value of phantom unit awards issued during 2015 was $117.4 million based on a grant date market price of our common units ranging from $33.72 to $34.40 per unit. An estimated annual forfeiture rate of 3.5% was applied to these awards.
[2] Determined by dividing the aggregate grant date fair value of awards (before an allowance for forfeitures) by the number of awards issued.