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Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits [Roll Forward]      
Balance as of January 1 $ 280.3 $ 316.4 $ 328.2
Additions based on tax positions related to the current year 10.0 8.5 10.2
Additions for tax positions of prior years 4.3 2.7 9.6
Reductions for tax positions of prior years (8.0) (9.5) (5.1)
Reductions resulting from the lapse of statutes of limitations (5.2) (5.5) (0.3)
Settlements with taxing authorities (17.3) (32.3) (26.2)
Balance as of December 31 $ 264.1 $ 280.3 $ 316.4