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Supplemental Balance Sheet Information - Accounts Receivable (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accounts receivable $ 195.8 $ 191.6
Allowances and doubtful accounts (1.4) (1.5)
Accounts receivable, net $ 194.4 $ 190.1