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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]        
Amortization expense of intangible assets $ 2.9 $ 3.1 $ 5.8 $ 6.2
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 5.6   5.6  
Finite-Lived Intangible Assets, Amortization Expense, Year Two 10.7   10.7  
Finite-Lived Intangible Assets, Amortization Expense, Year Three 10.1   10.1  
Finite-Lived Intangible Assets, Amortization Expense, Year Four 9.2   9.2  
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 8.0   $ 8.0