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Other Comprehensive Income (Loss) (Tax Effect) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Benefit (provision) for income taxes allocated to other comprehensive income (loss) items $ (170.3) $ 27.2
Foreign Currency Translation Gains (Losses)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Benefit (provision) for income taxes allocated to other comprehensive income (loss) items (75.3) (38.5)
Unrealized net gains/losses on securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Benefit (provision) for income taxes allocated to other comprehensive income (loss) items 4.4 (0.3)
Defined Benefit Pension and Retiree Health Benefit Plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Benefit (provision) for income taxes allocated to other comprehensive income (loss) items (31.3) (25.7)
Effective portion of cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Benefit (provision) for income taxes allocated to other comprehensive income (loss) items $ (68.1) $ 91.7