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Other Comprehensive Income (Loss) (Reclassification) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other–net, (income) expense $ (0.1) $ (18.7) $ (11.1) $ 17.0
Total before tax 427.2 1,565.5 4,045.8 4,710.0
Tax benefit (484.6) (113.8) (995.1) (402.9)
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications, net of tax 15.9 71.1 21.7 192.4
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 16.4 72.4 49.2 218.3
Tax benefit (3.4) (15.2) (10.3) (45.8)
Total reclassifications, net of tax 13.0 57.2 38.9 172.5
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 (12.7) (13.1) (37.9) (39.2)
Actuarial losses, net | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other–net, (income) expense 29.1 85.5 87.1 257.5
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 $ 2.9 $ 13.9 $ (17.2) $ 19.9