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Retirement Benefits - Schedule of Expected Benefit Payments, Contributions and Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |
Projected benefit obligation | $ 2,297.0 | $ 2,395.3 |
Fair value of plan assets | 1,058.4 | 1,035.4 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |
Fair value of plan assets | 1,058.4 | 1,035.4 |
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract] |  |  |
Total other comprehensive income (loss) during period | 651.8 | (776.5) | $ 616.9
Defined Benefit Pension Plans |  |  |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2025 | 677.0 |  |
2026 | 694.4 |  |
2027 | 721.4 |  |
2028 | 746.9 |  |
2029 | 778.4 |  |
2030 - 2034 | 4,388.7 |  |
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |
Fair value of plan assets | 595.0 | 564.3 |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |
Accumulated benefit obligation | 1,655.8 | 1,659.5 |
Fair value of plan assets | 595.0 | 564.3 |
Components of net periodic (benefit) cost: |  |  |
Service cost | 338.7 | 290.4 | 351.7
Interest cost | 661.7 | 648.2 | 398.1
Expected return on plan assets | (1,112.2) | (1,055.0) | (947.6)
Amortization of prior service (benefit) cost | 2.1 | 2.4 | 2.4
Recognized actuarial (gain) loss | 125.1 | 122.0 | 342.4
Net periodic (benefit) cost | 15.4 | 8.0 | 147.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract] |  |  |
Actuarial gain (loss) arising during period | 554.5 | (763.9) | 823.6
Amortization of prior service (benefit) cost included in net income | 2.1 | 2.4 | 2.4
Amortization of net actuarial (gain) loss included in net income | 125.1 | 122.0 | 342.4
Foreign currency exchange rate changes and other | 15.6 | (29.2) | 55.5
Total other comprehensive income (loss) during period | 697.3 | (668.7) | 1,223.9
Retiree Health Benefit Plans |  |  |
Defined Benefit Plan, Expected Future Benefit Payment [Abstract] |  |  |
2025 | 93.4 |  |
2026 | 93.6 |  |
2027 | 94.4 |  |
2028 | 95.0 |  |
2029 | 95.1 |  |
2030 - 2034 | 477.5 |  |
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 | 141.5 | 157.7 |
Fair value of plan assets | 0.0 | 0.0 |
Components of net periodic (benefit) cost: |  |  |
Service cost | 35.4 | 31.8 | 46.6
Interest cost | 62.1 | 61.3 | 37.8
Expected return on plan assets | (192.3) | (182.1) | (152.1)
Amortization of prior service (benefit) cost | (5.6) | (52.9) | (54.8)
Recognized actuarial (gain) loss | (2.6) | (5.8) | 0.9
Net periodic (benefit) cost | (103.0) | (147.7) | (121.6)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax [Abstract] |  |  |
Actuarial gain (loss) arising during period | (37.2) | (49.8) | (552.2)
Amortization of prior service (benefit) cost included in net income | (5.6) | (52.9) | (54.8)
Amortization of net actuarial (gain) loss included in net income | (2.6) | (5.8) | 0.9
Foreign currency exchange rate changes and other | (0.1) | 0.7 | (0.9)
Total other comprehensive income (loss) during period | $ (45.5) | $ (107.8) | $ (607.0)

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