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Supplemental Balance Sheet Information - Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Taxes payable $ 9.4 $ 10.0
Accrued compensation benefits 4.9 4.6
Other 15.3 17.2
Total $ 29.6 $ 31.8