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Intangible Assets (Schedule of Finite-Lived Intangible Assets, Future Amortization Expense) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Remainder of 2017 $ 13.7  
2018 17.4  
2019 12.8  
2020 7.6  
2021 2.8  
2022 and thereafter 1.1  
Net Book Value $ 55.4 $ 59.7