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Goodwill And Other Intangible Assets (Finite Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Goodwill And Other Intangible Assets [Abstract]    
2021 $ 3.7  
2022 3.7  
2023 3.7  
2024 3.6  
2025 3.5  
After 2025 18.9  
Total Net Carrying Amount $ 37.1 $ 21.5