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Schedule II—Valuation and Qualifying Accounts Schedule II—Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 2.2 $ 3.5 $ 1.9
Charged (credited) to costs and expenses 0.6 0.6 2.4
Other (0.1) (1.9) (0.8)
Balance at end of year 2.7 2.2 3.5
Allowance for deferred tax assets      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 11.2 14.9 122.3
Charged (credited) to costs and expenses (0.5) (3.7) (107.4)
Other 0.0 0.0 0.0
Balance at end of year $ 10.7 $ 11.2 $ 14.9