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Supplemental Balance Sheet Information - Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Taxes payable $ 10.0 $ 3.4
Accrued compensation benefits 4.6 4.4
Other 17.2 16.0
Total $ 31.8 $ 23.8