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Goodwill and Identifiable Intangible Assets - Future Estimated Amortization of Identifiable Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Year Ended December 31,    
2020 $ 31.5  
2021 29.1  
2022 27.6  
2023 19.4  
2024 18.0  
Thereafter 55.7  
Net $ 181.3 $ 206.0