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Other Comprehensive Income (Loss) (Tax Effect) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items $ 36.0 $ (65.3)
Foreign Currency Translation Gains (Losses)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items 46.5 (13.7)
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 (2.6) 6.7
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 (4.0) (28.4)
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 $ (3.9) $ (29.9)