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Goodwill and Identifiable Intangible Assets - Future Estimated Amortization of Identifiable Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Future estimated amortization of identifiable intangible assets    
2018 $ 33.4  
2019 31.5  
2020 29.1  
2021 27.7  
2022 19.6  
Thereafter 64.7  
Net $ 206.0 $ 239.4