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Goodwill and Other Intangible Assets (Schedule of Finite-Lived Intangible Assets, Future Amortization Expense) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2018 $ 9.1  
2019 32.5  
2020 27.1  
2021 18.8  
2022 16.3  
2023 and thereafter 17.9  
Net Book Value $ 121.7 $ 43.4