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Goodwill and Identifiable Intangible Assets - Future Estimated Amortization of Identifiable Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Future estimated amortization of identifiable intangible assets    
2018 $ 41.0  
2019 34.5  
2020 29.9  
2021 26.6  
2022 23.6  
Thereafter 83.7  
Net $ 239.4 $ 240.7