Investment in and Advances to Unconsolidated Affiliates - Affiliate Income Statement (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Affiliate Income Statement [Abstract]
Net revenue	$ 89.5	$ 107.4
Operating and SG&A expense	61.0	84.1
Depreciation and amortization	2.2	6.6
Total operating expense	63.2	90.7
Operating income	26.3	16.7
Interest and other, net	(17.0)	(2.9)
Net income	$ 9.3	$ 13.8