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Other Comprehensive Income (Loss) (Schedule of Tax Effects) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Benefit/(provision) for income taxes allocated to other comprehensive income (loss) items $ (250.0) $ (695.3) $ 200.9
Foreign Currency Translation Gains (Losses)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Benefit/(provision) for income taxes allocated to other comprehensive income (loss) items (75.9) (136.2) 128.3
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 12.4 4.7 (4.3)
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 (95.6) (532.0) 44.8
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 $ (90.9) $ (31.8) $ 32.1