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Supplemental Balance Sheet Information - Accounts receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts Receivable $ 204.9 $ 190.0
Allowances and doubtful accounts (1.9) (1.5)
Accounts receivable, net $ 203.0 $ 188.5