Equity-Based Awards, Phantom Unit Awards (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Summary of awards activity, equity instruments other than options, additional disclosures [Abstract]
Cash payments made in connection with DERs		$ 7.0	$ 5.8
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)		(5,141,095)
Forfeited (in units)		(119,963)
End of period (in units)		18,109,029
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]	27.19
Forfeited weighted-average grant date fair value per unit (in dollars per unit)	[2]	25.08
Weighted-average grant date fair value per unit, at end of period (in dollars per unit)	[2]	$ 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		$ 7.0	5.8
Total intrinsic value of phantom unit awards that vested during period		112.7	$ 109.2
Unrecognized Compensation Expense [Abstract]
Unrecognized compensation cost		$ 269.8
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)		$ 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		$ 229.2

[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.