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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Cash payments made in connection with DERs     $ 15.2 $ 12.9
Phantom Unit Awards [Member]        
Summary of awards activity, equity instruments other than options [Roll Forward]        
Beginning of period (in units)     15,669,442  
Granted (in units) [1]     7,700,645  
Vested (in units)     (5,417,475)  
Forfeited (in units)     (254,633)  
End of period (in units) 17,697,979   17,697,979  
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]     $ 26.76  
Granted weighted-average grant date fair value per unit (in dollars per unit) [1],[2]     21.30  
Vested weighted-average grant date fair value per unit (in dollars per unit) [2]     27.06  
Forfeited weighted-average grant date fair value per unit (in dollars per unit) [2]     24.77  
Weighted-average grant date fair value per unit, at end of period (in dollars per unit) [2] $ 24.32   $ 24.32  
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]        
Aggregate grant date fair value     $ 164.0  
Estimated forfeiture rate     2.00%  
Cash payments made in connection with DERs $ 8.2 $ 7.1 $ 15.2 12.9
Total intrinsic value of phantom unit awards that vested during period 6.4 $ 2.2 119.1 $ 111.4
Unrecognized Compensation Expense [Abstract]        
Unrecognized compensation cost 227.2   $ 227.2  
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)     $ 20.79  
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)     $ 21.44  
Phantom Unit Awards [Member] | Enterprise [Member]        
Unrecognized Compensation Expense [Abstract]        
Unrecognized compensation cost $ 190.7   $ 190.7  
[1] The aggregate grant date fair value of phantom unit awards issued during 2021 was $164.0 million based on a grant date market price of the Partnership’s common units ranging from $20.79 to $21.44 per unit.  An estimated annual forfeiture rate of 2.0% 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.