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Other Comprehensive Income (Loss) (Reclassification) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other–net, (income) expense $ 28.5 $ (63.9)
Total before tax 1,476.4 1,679.9
Tax benefit (121.1) (223.4)
Total reclassifications, net of tax 1,355.3 1,456.5
Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total reclassifications, net of tax 89.7 80.5
Defined Benefit Pension and Retiree Health Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax 108.8 98.0
Tax benefit (22.9) (20.6)
Total reclassifications, net of tax 85.9 77.4
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 (13.8) (13.8)
Actuarial losses, net | Reclassification out of Accumulated Other Comprehensive Income    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Other–net, (income) expense 122.6 111.8
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 $ 3.8 $ 3.1