Investment in and Advances to Unconsolidated Affiliates - Affiliate Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Affiliate Income Statement [Abstract]
Net revenue	$ 148.2	$ 160.8	$ 292.8	$ 416.6
Operating and SG&A expense	86.1	113.7	194.1	293.8
Depreciation and amortization	4.3	3.6	12.6	9.1
Total operating expense	90.4	117.3	206.7	302.9
Operating income	57.8	43.5	86.1	113.7
Interest and other, net	(9.4)	(17.6)	(58.6)	(59.9)
Net income	$ 48.4	$ 25.9	$ 27.5	$ 53.8