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Retirement Benefits (Schedule of Expected Benefit Payments, Contributions and Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |
Projected benefit obligation | $ 2,395.3 | $ 2,211.2 |
Fair value of plan assets | 1,035.4 | 977.1 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |
Fair value of plan assets | 1,035.4 | 977.1 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract] |  |  |
Total other comprehensive income (loss) during period | (776.5) | 616.9 | $ 2,699.4
Defined Benefit Pension Plans |  |  |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2023 | 661.2 |  |
2024 | 671.4 |  |
2025 | 695.0 |  |
2026 | 722.5 |  |
2027 | 746.5 |  |
2029-2033 | 4,160.7 |  |
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |
Fair value of plan assets | 564.3 | 652.7 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |
Accumulated benefit obligation | 1,659.5 | 1,721.7 |
Fair value of plan assets | 564.3 | 652.7 |
Components of net periodic (benefit) cost: |  |  |
Service cost | 290.4 | 351.7 | 369.2
Interest cost | 648.2 | 398.1 | 337.8
Expected return on plan assets | (1,055.0) | (947.6) | (949.3)
Amortization of prior service (benefit) cost | 2.4 | 2.4 | 4.2
Recognized actuarial (gain) loss | 122.0 | 342.4 | 487.7
Net periodic (benefit) cost | 8.0 | 147.0 | 249.6
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract] |  |  |
Actuarial gain (loss) arising during period | (763.9) | 823.6 | 2,072.4
Amortization of prior service (benefit) cost included in net income | 2.4 | 2.4 | 4.2
Amortization of net actuarial (gain) loss included in net income | 122.0 | 342.4 | 487.7
Foreign currency exchange rate changes and other | (29.2) | 55.5 | 47.2
Total other comprehensive income (loss) during period | (668.7) | 1,223.9 | 2,611.5
Retiree Health Benefit Plans |  |  |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2023 | 93.8 |  |
2024 | 94.5 |  |
2025 | 94.7 |  |
2026 | 95.2 |  |
2027 | 95.6 |  |
2029-2033 | 475.9 |  |
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 | 157.7 | 149.8 |
Fair value of plan assets | 0.0 | 0.0 |
Components of net periodic (benefit) cost: |  |  |
Service cost | 31.8 | 46.6 | 49.2
Interest cost | 61.3 | 37.8 | 32.5
Expected return on plan assets | (182.1) | (152.1) | (146.2)
Amortization of prior service (benefit) cost | (52.9) | (54.8) | (59.6)
Recognized actuarial (gain) loss | (5.8) | 0.9 | 3.2
Net periodic (benefit) cost | (147.7) | (121.6) | (120.9)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract] |  |  |
Actuarial gain (loss) arising during period | (49.8) | (552.2) | 142.5
Amortization of prior service (benefit) cost included in net income | (52.9) | (54.8) | (59.6)
Amortization of net actuarial (gain) loss included in net income | (5.8) | 0.9 | 3.2
Foreign currency exchange rate changes and other | 0.7 | (0.9) | 1.9
Total other comprehensive income (loss) during period | $ (107.8) | $ (607.0) | $ 88.0

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