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Goodwill and Intangible Assets - Future Amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Estimated future amortization expense related to amortizable intangible asset:    
2016 $ 21.3  
2017 21.1  
2018 16.8  
2019 4.9  
2020 4.0  
Thereafter 6.0  
Net Carrying Amount, intangible assets subject to amortization $ 74.1 $ 77.5