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Other Comprehensive Income (Loss) - AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     $ 10,863.7  
Other comprehensive income (loss) before reclassifications $ 79.9 $ (12.1) (29.2) $ 38.0
Net amount reclassified from accumulated other comprehensive loss 23.8 15.9 81.4 21.7
Net other comprehensive income (loss) 103.7 3.8 52.2 59.7
Ending balance 14,320.7   14,320.7  
Accumulated Other Comprehensive Loss        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (4,378.5) (3,788.7) (4,327.0) (3,844.6)
Ending balance (4,274.8) (3,784.9) (4,274.8) (3,784.9)
Foreign Currency Translation Gains (Losses)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (2,001.6) (1,885.3) (1,819.0) (1,874.2)
Other comprehensive income (loss) before reclassifications 117.9 (88.7) (74.9) (74.6)
Net amount reclassified from accumulated other comprehensive loss 0.0 0.0 10.2 (25.2)
Net other comprehensive income (loss) 117.9 (88.7) (64.7) (99.8)
Ending balance (1,883.7) (1,974.0) (1,883.7) (1,974.0)
Net Unrealized Gains (Losses) on Available-For-Sale Securities        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (32.6) (33.5) (26.2) (37.1)
Other comprehensive income (loss) before reclassifications 15.9 (13.5) 9.3 (11.3)
Net amount reclassified from accumulated other comprehensive loss 0.0 1.4 0.2 2.8
Net other comprehensive income (loss) 15.9 (12.1) 9.5 (8.5)
Ending balance (16.7) (45.6) (16.7) (45.6)
Defined Benefit Pension and Retiree Health Benefit Plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (2,633.6) (2,058.8) (2,697.3) (2,062.3)
Other comprehensive income (loss) before reclassifications (28.9) 10.5 (12.1) (11.9)
Net amount reclassified from accumulated other comprehensive loss 23.7 13.0 70.6 38.9
Net other comprehensive income (loss) (5.2) 23.5 58.5 27.0
Ending balance (2,638.8) (2,035.3) (2,638.8) (2,035.3)
Net Unrealized Gains (Losses) on Cash Flow Hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 289.3 188.9 215.5 129.0
Other comprehensive income (loss) before reclassifications (25.0) 79.6 48.5 135.8
Net amount reclassified from accumulated other comprehensive loss 0.1 1.5 0.4 5.2
Net other comprehensive income (loss) (24.9) 81.1 48.9 141.0
Ending balance $ 264.4 $ 270.0 $ 264.4 $ 270.0