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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense of intangible assets $ 2.8 $ 3.0 $ 8.7 $ 9.2
Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year 2.7   2.7  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 10.7   10.7  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 10.1   10.1  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 9.2   9.2  
Finite-Lived Intangible Assets, Amortization Expense, Year Four $ 8.0   $ 8.0