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Goodwill and Other Intangible Assets - Amortization of Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
2018 $ 219.8  
2019 201.4  
2020 167.6  
2021 72.3  
2022 38.4  
Thereafter 197.5  
Total future amortization expense $ 897.0 $ 1,055.6