Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Inventory Allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	$ 3.8	$ 3.5	$ 1.6
Charged to costs and expenses	14.6	8.8	10.0
Deductions	(6.7)	(8.5)	(8.1)
Ending Balance	11.7	3.8	3.5
Prepaid Expenses and Other Current Assets Allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance	5.3	4.9	2.0
Charged to costs and expenses	0.0	0.4	2.9
Deductions	(1.0)	0.0	0.0
Ending Balance	$ 4.3	$ 5.3	$ 4.9