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Income Taxes (Gross Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Gross unrecognized tax benefits:    
Gross unrecognized income tax benefits, beginning of period $ 351.2 $ 281.7
Additions for tax positions of the current year 55.8 67.9
Additions for tax positions of prior years 7.4 5.5
Reductions for tax positions of prior years for:    
Changes in judgments (0.5)  
Changes in judgments   2.8
Settlements during the year 0.0 (15.4)
Lapses of applicable statute of limitations (2.4) (2.0)
Foreign currency translation and other (24.1)  
Foreign currency translation and other   10.7
Gross unrecognized income tax benefits, end of period $ 387.4 $ 351.2