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Income Taxes (Schedule Of Income Tax Provision) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]      
Income before provision for income taxes $ 711.7 $ 1,260.9 $ 549.5
Current provision for income taxes, Federal 152.7 217.9 53.8
Current provision for income taxes, State 28.5 38.6 6.6
Current provision for income taxes 181.2 256.5 60.4
Deferred provision for income taxes, Federal (10.8) 36.7 57.3
Deferred provision for income taxes, State 3.1 7.9 11.0
Deferred provision for income taxes (7.7) 44.6 68.3
Interest 2.4 1.5 (0.2)
Unrecognized Tax Benefits, Income Tax Penalties Expense 0.0 0.0 0.0
Interest and penalties expense (benefit) 2.4 1.5 (0.2)
Provision for income taxes $ 175.9 $ 302.6 $ 128.5