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Operations and Summary of Significant Accounting Policies - Expenses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounting Policies [Line Items]      
Advertising expense $ 42.6 $ 46.8 $ 50.0
Interest Income (Expense), Net [Abstract]      
Interest expense 54.5 65.4 64.1
Interest income (9.4) (13.3) (18.7)
Interest expense, net 45.1 52.1 45.4
Selling, general and administrative expenses      
Accounting Policies [Line Items]      
Shipping and handling fees $ 29.5 $ 24.3 $ 24.6