Investment in and Advances to Unconsolidated Affiliates - Affiliate Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Affiliate Income Statement [Abstract]
Net revenue	$ 160.8	$ 105.2	$ 416.6	$ 322.1
Operating and SG&A expense	113.7	76.4	293.8	240.5
Depreciation and amortization	3.6	5.9	9.1	19.0
Total operating expense	117.3	82.3	302.9	259.5
Operating income	43.5	22.9	113.7	62.6
Interest and other, net	(17.6)	(1.0)	(59.9)	(5.6)
Net income	$ 25.9	$ 21.9	$ 53.8	$ 57.0