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Goodwill and Intangible Assets - Future Amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Estimated future amortization expense related to amortizable intangible asset:    
2018 $ 24.4  
2019 16.6  
2020 13.3  
2021 12.6  
2022 6.9  
Thereafter 8.0  
Net Carrying Amount, intangible assets subject to amortization $ 81.8 $ 69.1