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Equity-Based Awards, Phantom Unit Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]    
Cash payments made in connection with DERs $ 4.5 $ 3.9
Phantom Unit Awards [Member]    
Summary of awards activity, equity instruments other than options [Roll Forward]    
Beginning of period (in units) 10,333,277  
Granted (in units) [1] 6,831,820  
Vested (in units) (3,398,583)  
Forfeited (in units) (77,627)  
End of period (in units) 13,688,887  
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] $ 26.97  
Granted weighted-average grant date fair value per unit (in dollars per unit) [1],[2] 27.75  
Vested weighted-average grant date fair value per unit (in dollars per unit) [2] 27.59  
Forfeited weighted-average grant date fair value per unit (in dollars per unit) [2] 27.09  
Weighted-average grant date fair value per unit, at end of period (in dollars per unit) [2] $ 27.21  
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]    
Aggregate grant date fair value $ 189.6  
Estimated forfeiture rate 3.00%  
Cash payments made in connection with DERs $ 4.5 3.9
Total intrinsic value of phantom unit awards that vested during period 97.0 $ 82.0
Unrecognized Compensation Expense [Abstract]    
Unrecognized compensation cost $ 247.6  
Recognition period for total unrecognized compensation cost 2 years 4 months 24 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) $ 27.75  
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) $ 27.75  
Phantom Unit Awards [Member] | Enterprise [Member]    
Unrecognized Compensation Expense [Abstract]    
Unrecognized compensation cost $ 213.6  
[1] The aggregate grant date fair value of phantom unit awards issued during 2019 was $189.6 million based on a grant date market price of our common units of $27.75 per unit. An estimated annual forfeiture rate of 3.0% 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.