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Income Taxes (Summary of Gross Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Gross unrecognized tax benefits:    
Gross unrecognized income tax benefits, beginning of period $ 281.7 $ 246.4
Additions for tax positions of the current year 67.9 51.7
Additions for tax positions of prior years 5.5 3.9
Reductions for tax positions of prior years for:    
Changes in judgments 2.8  
Changes in judgments   (6.5)
Settlements during the year (15.4) (0.6)
Lapses of applicable statute of limitations (2.0) (1.2)
Foreign currency translation and other 10.7  
Foreign currency translation and other   (12.0)
Gross unrecognized income tax benefits, end of period $ 351.2 $ 281.7