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Goodwill and Identifiable Intangible Assets - Future Estimated Amortization of Identifiable Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Future estimated amortization of identifiable intangible assets    
2017 $ 41.1  
2018 38.1  
2019 32.5  
2020 27.8  
2021 24.4  
Thereafter 76.7  
Net $ 240.7 $ 179.0