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Other Comprehensive Income (Loss) (AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 10,863.7  
Other comprehensive income (loss) before reclassifications (5.4) $ 76.8
Net amount reclassified from accumulated other comprehensive loss 32.9 (9.5)
Net other comprehensive income (loss) 27.5 67.3
Ending balance 12,897.4  
Accumulated Other Comprehensive Loss    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (4,327.0) (3,844.6)
Ending balance (4,299.5) (3,777.3)
Foreign Currency Translation Gains (Losses)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (1,819.0) (1,874.2)
Other comprehensive income (loss) before reclassifications (88.2) 72.8
Net amount reclassified from accumulated other comprehensive loss 10.2 (25.2)
Net other comprehensive income (loss) (78.0) 47.6
Ending balance (1,897.0) (1,826.6)
Net Unrealized Gains (Losses) on Available-For-Sale Securities    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (26.2) (37.1)
Other comprehensive income (loss) before reclassifications (4.8) 8.1
Net amount reclassified from accumulated other comprehensive loss 0.1 0.7
Net other comprehensive income (loss) (4.7) 8.8
Ending balance (30.9) (28.3)
Defined Benefit Pension and Retiree Health Benefit Plans    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (2,697.3) (2,062.3)
Other comprehensive income (loss) before reclassifications 15.6 (16.8)
Net amount reclassified from accumulated other comprehensive loss 23.0 13.0
Net other comprehensive income (loss) 38.6 (3.8)
Ending balance (2,658.7) (2,066.1)
Net unrealized gains/losses on cash flow hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 215.5 129.0
Other comprehensive income (loss) before reclassifications 72.0 12.7
Net amount reclassified from accumulated other comprehensive loss (0.4) 2.0
Net other comprehensive income (loss) 71.6 14.7
Ending balance $ 287.1 $ 143.7