Investment in and Advances to Unconsolidated Affiliates - Affiliate Income Statement (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Investments in and Advances to Affiliates [Line Items]
Net revenue	$ 393.0			$ 337.8			$ 1,232.4	$ 775.8
Net income (loss)	61.4	$ 108.3	$ 36.1	43.1	$ (118.8)	$ (23.5)	205.8	(99.2)
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Investments in and Advances to Affiliates [Line Items]
Net revenue	202.4			148.2			539.0	292.8
Operating and SG&A expense	115.2			86.1			310.6	194.1
Depreciation and amortization	4.4			4.3			13.1	12.6
Total operating expense	119.6			90.4			323.7	206.7
Operating income	82.8			57.8			215.3	86.1
Interest and other, net	(10.4)			(9.4)			(34.7)	(58.6)
Net income (loss)	$ 72.4			$ 48.4			$ 180.6	$ 27.5