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Supplemental Balance Sheet Information - Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Taxes payable $ 0.4 $ 0.4
Accrued compensation benefits 6.1 4.3
Other 5.3 15.1
Total $ 11.8 $ 19.8