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Goodwill and Purchased Intangible Assets, Estimated Future Amortization Expense Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2018 $ 17.5  
2019 17.3  
2020 17.2  
2021 12.9  
2022 7.7  
Thereafter 6.5  
Net $ 79.1 $ 81.2