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Other Comprehensive Income (Loss) (Tax Effect) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items $ (64.8) $ 36.0
Foreign currency translation gains/losses    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items (52.0) 46.5
Net unrealized gains/losses on available-for-sale securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items 1.4 (2.6)
Defined Benefit Pension and Retiree Health Benefit Plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items 4.8 (4.0)
Net unrealized gains/losses on cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items $ (19.0) $ (3.9)