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Other Comprehensive Income (Loss) - Reclassification (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other–net, (income) expense $ (7.8) $ (13.2) $ 21.0 $ (11.0)
Total before tax 3,517.2 2,088.9 6,053.3 3,618.6
Tax benefit (550.2) (325.7) (843.4) (510.5)
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications, net of tax 24.7 15.3 57.6 5.8
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 30.2 16.3 59.3 32.8
Tax benefit (6.3) (3.4) (12.4) (6.9)
Total reclassifications, net of tax 23.9 12.9 46.9 25.9
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 (0.9) (12.6) (1.8) (25.2)
Actuarial losses, net | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other–net, (income) expense 31.1 28.9 61.1 58.0
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 $ 0.8 $ 2.4 $ 10.7 $ (20.1)