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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance for Doubtful Accounts      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 3.1 $ 2.9 $ 2.1
Additions, Charged to Expenses 0.4 1.1 1.2
Additions, Acquired 0.0 0.0 0.2
Deductions, Amounts Written Off (1.1) (0.8) (0.6)
Foreign Exchange 0.0 (0.1) 0.0
Ending Balance 2.4 3.1 2.9
Allowance for Cash Discounts      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Beginning Balance 5.0 5.1 4.6
Additions, Charged to Expenses 86.9 83.8 75.5
Additions, Acquired 0.0 0.0 0.7
Deductions, Amounts Written Off (86.8) (83.8) (75.8)
Foreign Exchange 0.0 (0.1) 0.1
Ending Balance 5.1 5.0 5.1
Sales Returns and Allowances      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Beginning Balance 12.1 13.9 12.1
Additions, Charged to Expenses 97.2 93.3 74.9
Additions, Acquired 0.0 0.0 0.1
Deductions, Amounts Written Off (96.4) (95.0) (73.4)
Foreign Exchange 0.1 (0.1) 0.2
Ending Balance $ 13.0 $ 12.1 $ 13.9