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Goodwill and Purchased Intangible Assets - Estimated Future Amortization Expense Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2020 $ 39.5  
2021 35.3  
2022 30.0  
2023 25.7  
2024 6.3  
Thereafter 0.0  
Net $ 136.8 $ 69.5