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Goodwill And Other Intangible Assets (Narrative) (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 of intangible assets $ 3.4 $ 3.5 $ 10.3 $ 10.7
Finite-Lived Intangible Assets, Amortization Expense, Next Rolling Twelve Months 3.3   3.3  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 12.9   12.9  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 12.2   12.2  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 11.4   11.4  
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 10.7   $ 10.7