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Acquisitions, Goodwill and Other Intangible Assets (Amortization Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense $ 6.1 $ 4.7 $ 12.6 $ 9.8
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]        
Remainder of 2017 (from July 1 through December 31) 11.0   11.0  
2017 20.6   20.6  
2018 19.1   19.1  
2019 16.3   16.3  
2020 12.9   12.9  
Thereafter $ 25.9   $ 25.9