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Equity-based Awards, Phantom Unit Awards (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Cash payments made in connection with DERs     $ 2.4 $ 0
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)     0  
Granted (in units)     3,522,990 [1]  
Vested (in units)     (34,800)  
Forfeited (in units)     (92,800)  
End of period (in units) 3,395,390   3,395,390  
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)     $ 0 [2]  
Granted weighted-average grant date fair value per unit (in dollars per unit)     $ 33.12 [1],[2]  
Vested weighted-average grant date fair value per unit (in dollars per unit)     $ 33.04 [2]  
Forfeited weighted-average grant date fair value per unit (in dollars per unit)     $ 33.04 [2]  
Weighted-average grant date fair value per unit, at end of period (in dollars per unit) $ 33.12 [2]   $ 33.12 [2]  
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Aggregate grant date fair value     116.7  
Estimated forfeiture rate (in hundredths)     3.40%  
Cash payments made in connection with DERs 1.2 0 2.4 0
Total intrinsic value of phantom unit awards that vested during period 0.1 0 1.3 0
Unrecognized Compensation Expense [Abstract]        
Unrecognized compensation cost 72.2   72.2  
Recognition period for total unrecognized compensation cost     2 years 2 months 12 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)     $ 33.04  
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)     $ 37.59  
Phantom Unit Awards [Member] | Enterprise [Member]
        
Unrecognized Compensation Expense [Abstract]        
Unrecognized compensation cost $ 66.1   $ 66.1  
[1] The aggregate grant date fair value of phantom unit awards issued during 2014 was $116.7 million based on a grant date market price of our common units ranging from $33.04 to $37.59 per unit. An estimated annual forfeiture rate of 3.4% 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.