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Supplemental Balance Sheet Information - Schedule of Estimated Amortization Expense (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Estimated Amortization Expense    
2018 $ 8.8  
2019 15.3  
2020 13.1  
2021 10.9  
2022 10.4  
Thereafter 75.3  
Net Carrying Amount $ 133.8 $ 143.2