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Goodwill and Intangible Assets - Future Amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Estimated future amortization expense related to amortizable intangible asset:    
2017 $ 24.4  
2018 20.0  
2019 8.2  
2020 7.3  
2021 6.5  
Thereafter 2.7  
Net Carrying Amount, intangible assets subject to amortization $ 69.1 $ 74.1