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Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other–net, (income) expense $ (3.5) $ 28.8
Total before tax 3,456.1 2,536.1
Tax benefit (696.8) (293.2)
Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications, net of tax 47.9 32.9
Amortization of retirement benefit items | Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax 20.5 29.1
Tax benefit (4.3) (6.1)
Total reclassifications, net of tax 16.2 23.0
Prior service costs (benefits), net | Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other–net, (income) expense 0.4 (0.9)
Actuarial losses, net | Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other–net, (income) expense 20.1 30.0
Other, net of tax | Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other–net, (income) expense $ 31.7 $ 9.9