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Other Comprehensive Income (Loss) (Tax Effect) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items $ (115.3) $ (169.2) $ (99.1) $ (375.1)
Foreign Currency Translation Gains (Losses)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Benefit (expense) for income taxes allocated to other comprehensive income (loss) items (90.3) (133.3) (50.2) (234.2)
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 3.5 3.4 2.5 13.1
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 (6.9) (22.4) (13.9) (73.2)
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 $ (21.6) $ (16.9) $ (37.5) $ (80.8)