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Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other, net (income) expense $ (25.4) $ (32.7) $ (14.3)
Total before tax 12,680.4 6,554.6 6,806.4
Tax benefit (2,090.4) (1,314.2) (561.6)
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Total reclassifications for the period, net of tax 103.7 35.8 250.8
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 119.0 65.7 290.9
Tax benefit (25.0) (13.8) (61.1)
Total reclassifications for the period, net of tax 94.0 51.9 229.8
Prior service benefits, net | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other, net (income) expense (3.5) (50.5) (52.4)
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other, net (income) expense 122.5 116.2 343.3
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 $ 9.7 $ (16.1) $ 21.0