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Income Taxes (Schedule Of Components Of Income From Continuing Operations Before Income Taxes And Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Income (loss) before income taxes $ 509.1 $ 202.4 $ 273.9
Income tax expense (benefit)      
Federal - Current 96.0 15.6 18.4
Federal - Deferred 4.7 21.7 31.0
State - Current and deferred 22.3 10.3 10.9
Total $ 123.0 $ 47.6 $ 60.3