Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		$ 21.4	$ 19.1	$ 20.7
Charged to costs and expenses		(2.3)	2.3	(1.3)
Deductions	[1]	(1.1)	0.0	(0.3)
Balance at end of period		18.0	21.4	19.1
Deferred Tax Asset Valuation Allowance [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		20.9	18.7	20.1
Charged to costs and expenses		(3.0)	2.5	(1.3)
Deductions	[1]	(1.9)	(0.3)	(0.1)
Balance at end of period		16.0	20.9	18.7
Allowance for Doubtful Accounts Receivable [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		0.5	0.4	0.6
Charged to costs and expenses		0.7	(0.2)	0.0
Deductions	[1]	0.8	0.3	(0.2)
Balance at end of period		$ 2.0	$ 0.5	$ 0.4

[1] Includes accounts receivable written off, the write-off or write-down of valuation allowances, and translation adjustments.