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Income Taxes (Components Of Provision For Income Taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal, Current (expense) benefit $ (147.9) $ (159.1) $ (145.1)
State, Current (expense) benefit (31.3) (28.0) (41.7)
Foreign, including foreign withholding tax, Current (expense) benefit (43.3) (24.4) (26.3)
Current (expense) benefit 222.5 211.5 213.1
Federal, Deferred (expense) benefit 3.3 25.6 18.0
State, Deferred (expense) benefit 3.3 (11.2) 4.8
Foreign, Deferred (expense) benefit (20.3) 38.2 (16.1)
Deferred (expense) benefit 13.7 (52.6) (6.7)
Income tax (expense) benefit $ 236.2 $ 158.9 $ 206.4