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Receivables and Allowances (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable, Net, Current [Abstract]    
Trade accounts receivable $ 576.3 $ 565.5
Non-trade receivables 19.1 15.1
Accounts receivable, gross 595.4 580.6
Allowance for credit memos, returns and cash discounts (50.5) (45.9)
Allowance for doubtful accounts (4.6) (4.7)
Total allowances (55.1) (50.6)
ACCOUNTS RECEIVABLE, NET $ 540.3 $ 530.0