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Other Comprehensive Income (Loss) (Reclassification) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other–net, (income) expense $ 2.2 $ 59.3
Total before tax 1,529.7 2,053.6
Tax benefit (184.8) (150.7)
Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications, net of tax (9.5) 61.3
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 16.5 74.2
Tax benefit (3.5) (15.6)
Total reclassifications, net of tax 13.0 58.6
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 (12.6) (13.0)
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 87.2
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 $ (22.5) $ 2.7