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Other Comprehensive Income (Loss) (Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other, net (income) expense $ 51.4 $ (195.5) $ (56.6)
Total before tax 6,155.5 7,229.9 5,265.9
Income taxes (573.8) (1,036.2) (628.0)
Reclassifications from continuing operations (net of tax) 5,581.7 6,193.7 4,637.9
Reclassifications from discontinued operations (net of tax) 0.0 0.0 3,680.5
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Reclassifications from continuing operations (net of tax) 357.9 283.4 130.2
Reclassifications from discontinued operations (net of tax) 0.0 0.0 84.0
Total reclassifications for the period, net of tax 357.9 283.4 214.2
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 435.5 338.3 230.0
Income taxes (91.5) (71.0) (48.3)
Total reclassifications for the period, net of tax 344.0 267.3 181.7
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 (55.4) (55.0) (56.8)
Actuarial losses | Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other, net (income) expense 490.9 393.3 286.8
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 $ 13.9 $ 16.1 $ (51.5)