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Equity-Based Awards, Phantom Unit Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]    
Cash payments made in connection with DERs $ 3.2 $ 2.0
Phantom Unit Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting rate of phantom unit awards 25.00%  
Summary of awards activity, equity instruments other than options [Roll Forward]    
Beginning of period (in units) 7,767,501  
Granted (in units) [1] 4,203,510  
Vested (in units) (2,238,568)  
Forfeited (in units) (41,684)  
End of period (in units) 9,690,759  
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] $ 27.20  
Granted weighted-average grant date fair value per unit (in dollars per unit) [1],[2] 28.87  
Vested weighted-average grant date fair value per unit (in dollars per unit) [2] 28.33  
Forfeited weighted-average grant date fair value per unit (in dollars per unit) [2] 28.19  
Weighted-average grant date fair value per unit, at end of period (in dollars per unit) [2] $ 27.66  
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]    
Aggregate grant date fair value $ 121.4  
Estimated forfeiture rate 3.80%  
Cash payments made in connection with DERs $ 3.2 2.0
Total intrinsic value of phantom unit awards that vested during period 63.2 $ 36.3
Unrecognized Compensation Expense [Abstract]    
Unrecognized compensation cost $ 166.1  
Recognition period for total unrecognized compensation cost 2 years 3 months 18 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) $ 28.87  
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) $ 28.87  
Phantom Unit Awards [Member] | Enterprise [Member]    
Unrecognized Compensation Expense [Abstract]    
Unrecognized compensation cost $ 145.8  
[1] The aggregate grant date fair value of phantom unit awards issued during 2017 was $121.4 million based on a grant date market price of our common units of $28.87 per unit. An estimated annual forfeiture rate of 3.8% 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.