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Other Comprehensive Income (Loss) (Reclassification) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other–net, (income) expense $ (14.5) $ (84.6) $ 13.9 $ (148.5)
Total before tax 1,593.9 1,643.7 3,070.3 3,323.6
Tax benefit (203.7) (231.7) (324.8) (455.1)
Total reclassifications, net of tax     2,745.5 2,868.5
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications, net of tax 90.1 88.9 179.8 169.4
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 109.6 103.9 218.4 201.9
Tax benefit (23.0) (21.8) (45.9) (42.4)
Total reclassifications, net of tax 86.6 82.1 172.5 159.5
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 (13.8) (13.8) (27.6) (27.6)
Actuarial losses, net | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other–net, (income) expense 123.4 117.7 246.0 229.5
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 $ 3.5 $ 6.8 $ 7.3 $ 9.9