Investment In and Advances to Unconsolidated Affiliates - Income Statement of Equity Method Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net revenue:
Net revenue	$ 303.3	$ 216.1	$ 195.2
Operating and SG&A expense	204.9	142.8	137.2
Depreciation and amortization	25.9	18.5	15.2
Operating income	72.5	54.8	42.8
Interest and other expense, net	(8.5)	(6.9)	(6.2)
Net income	$ 64.0	$ 47.9	$ 36.6