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Retirement Benefits (Schedule of Expected Benefit Payments, Contributions and Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]      
Projected benefit obligation $ 2,211.2 $ 3,360.3  
Fair value of plan assets 977.1 1,542.8  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]      
Fair value of plan assets 977.1 1,542.8  
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract]      
Total other comprehensive income (loss) during period 616.9 2,699.4 $ (157.1)
Defined Benefit Pension Plans      
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2023 648.2    
2024 664.5    
2025 682.6    
2026 705.9    
2027 732.7    
2028-2032 4,079.4    
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]      
Fair value of plan assets 652.7 973.4  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]      
Accumulated benefit obligation 1,721.7 2,532.0  
Fair value of plan assets 652.7 973.4  
Components of net periodic (benefit) cost:      
Service cost 351.7 369.2 325.5
Interest cost 398.1 337.8 425.8
Expected return on plan assets (947.6) (949.3) (901.5)
Amortization of prior service (benefit) cost 2.4 4.2 4.5
Recognized actuarial (gain) loss 342.4 487.7 396.3
Net periodic (benefit) cost 147.0 249.6 250.6
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract]      
Actuarial gain (loss) arising during period 823.6 2,072.4 (663.0)
Plan amendments during period 0.0 0.0 (2.2)
Amortization of prior service (benefit) cost included in net income 2.4 4.2 4.5
Amortization of net actuarial (gain) loss included in net income 342.4 487.7 396.3
Foreign currency exchange rate changes and other 55.5 47.2 (71.5)
Total other comprehensive income (loss) during period 1,223.9 2,611.5 (335.9)
Retiree Health Benefit Plans      
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]      
2023 89.0    
2024 91.6    
2025 92.4    
2026 92.8    
2027 93.4    
2028-2032 468.3    
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]      
Fair value of plan assets 0.0 0.0  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]      
Accumulated benefit obligation 149.8 212.6  
Fair value of plan assets 0.0 0.0  
Components of net periodic (benefit) cost:      
Service cost 46.6 49.2 40.8
Interest cost 37.8 32.5 43.7
Expected return on plan assets (152.1) (146.2) (158.1)
Amortization of prior service (benefit) cost (54.8) (59.6) (59.5)
Recognized actuarial (gain) loss 0.9 3.2 (3.0)
Net periodic (benefit) cost (121.6) (120.9) (136.1)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract]      
Actuarial gain (loss) arising during period (552.2) 142.5 238.8
Plan amendments during period 0.0 0.0 0.0
Amortization of prior service (benefit) cost included in net income (54.8) (59.6) (59.5)
Amortization of net actuarial (gain) loss included in net income 0.9 3.2 (3.0)
Foreign currency exchange rate changes and other (0.9) 1.9 2.4
Total other comprehensive income (loss) during period $ (607.0) $ 88.0 $ 178.7