Investment in and Advances to Unconsolidated Affiliates - Affiliate Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Affiliate Income Statement [Abstract]
Net revenue	$ 166.3	$ 114.5	$ 255.8	$ 216.1
Operating and SG&A expense	119.1	84.4	180.1	163.3
Depreciation and amortization	3.3	6.6	5.5	13.1
Total operating expense	122.4	91.0	185.6	176.4
Operating income	43.9	23.5	70.2	39.7
Interest and other, net	(25.3)	(2.6)	(42.3)	(4.9)
Net income	$ 18.6	$ 20.9	$ 27.9	$ 34.8