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Supplemental Balance Sheet Information - Accounts Receivable (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Accounts receivable $ 190.4 $ 204.9
Allowances and doubtful accounts (1.2) (1.9)
Accounts receivable, net 189.2 203.0
Doubtful accounts    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Allowances and doubtful accounts (0.9) (0.9)
Sales discounts    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Allowances and doubtful accounts (0.2) (0.8)
Sales returns    
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]    
Allowances and doubtful accounts $ (0.1) $ (0.2)