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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense of intangible assets $ 3.2 $ 3.4 $ 9.8 $ 10.3
Finite-Lived Intangible Assets, Amortization Expense, Next Rolling Twelve Months 3.1   3.1  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 12.2   12.2  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 11.4   11.4  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 10.7   10.7  
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 10.1   $ 10.1