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Income Taxes (Components Of Provision For Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal, Current (expense) benefit $ (145.1) $ (97.5) $ 124.0
State, Current (expense) benefit (41.7) (32.2) (10.5)
Foreign, including foreign withholding tax, Current (expense) benefit (26.3) (29.8) (29.2)
Current (expense) benefit 213.1 159.5 (84.3)
Federal, Deferred (expense) benefit 18.0 (3.9) (4.3)
State, Deferred (expense) benefit 4.8 0.2 (17.4)
Foreign, Deferred (expense) benefit (16.1) 165.8 2.1
Deferred (expense) benefit (6.7) (162.1) 19.6
Income tax (expense) benefit $ 206.4 $ (2.6) $ (64.7)