Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		$ 18.0	$ 21.4	$ 19.1
Charged to costs and expenses		0.1	(2.3)	2.3
Deductions	[1]	(1.7)	(1.1)	0.0
Balance at end of period		16.4	18.0	21.4
Deferred Tax Asset Valuation Allowance [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		16.0	20.9	18.7
Charged to costs and expenses		0.0	(3.0)	2.5
Deductions	[1]	(0.1)	(1.9)	(0.3)
Balance at end of period		15.9	16.0	20.9
Allowance for Doubtful Accounts Receivable [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		2.0	0.5	0.4
Charged to costs and expenses		0.1	0.7	(0.2)
Deductions	[1]	(1.6)	0.8	0.3
Balance at end of period		$ 0.5	$ 2.0	$ 0.5

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