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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense of intangible assets $ 12.9 $ 11.4 $ 12.2
Future Amortization Expense, 2020   10.7  
Future Amortization Expense, 2021   10.1  
Future Amortization Expense, 2022   9.2  
Future Amortization Expense, 2023   8.0  
Future Amortization Expense, 2024   $ 7.3