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Acquisitions, Goodwill and Other Intangible Assets (Amortization Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense $ 5.5 $ 4.5 $ 18.1 $ 14.3
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]        
Remainder of 2017 (from October 1 through December 31) 5.6   5.6  
2017 20.7   20.7  
2018 19.2   19.2  
2019 16.3   16.3  
2020 13.0   13.0  
Thereafter $ 26.1   $ 26.1