Equity-Based Awards (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Equity-based compensation expense [Abstract]
Total compensation expense	$ 38.5	$ 27.0	$ 70.5	$ 53.3
Phantom Unit Awards [Member]
Equity-based compensation expense [Abstract]
Total compensation expense	35.5	25.9	64.9	50.5
Profits Interest Awards [Member]
Equity-based compensation expense [Abstract]
Total compensation expense	3.0	1.0	5.6	2.6
Liability-classified awards [Member]
Equity-based compensation expense [Abstract]
Total compensation expense	$ 0.0	$ 0.1	$ 0.0	$ 0.2