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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

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