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v3.25.2

Retirement Benefits | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits Net pension and retiree health (benefit) cost included the following components:
| Defined Benefit Pension Plans
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Components of net periodic cost: |  |  |  |  |  |  |
Service cost | $ | 82.5 |  |  | $ | 85.6 |  |  | $ | 166.2 |  |  | $ | 169.4 |
Interest cost | 175.0 |  |  | 165.7 |  |  | 347.8 |  |  | 330.7 |
Expected return on plan assets | (271.6) |  |  | (277.9) |  |  | (541.1) |  |  | (555.5) |
Amortization of prior service cost | 0.5 |  |  | 0.5 |  |  | 1.0 |  |  | 1.0 |
Recognized actuarial loss | 21.9 |  |  | 31.8 |  |  | 42.8 |  |  | 62.4 |
Net periodic cost | $ | 8.3 |  |  | $ | 5.7 |  |  | $ | 16.7 |  |  | $ | 8.0 |
| Retiree Health Benefit Plans
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Components of net periodic benefit: |  |  |  |  |  |  |
Service cost | $ | 8.1 |  |  | $ | 9.5 |  |  | $ | 16.4 |  |  | $ | 17.7 |
Interest cost | 16.2 |  |  | 15.6 |  |  | 32.0 |  |  | 31.1 |
Expected return on plan assets | (46.2) |  |  | (48.0) |  |  | (92.4) |  |  | (96.1) |
Amortization of prior service benefit | (0.1) |  |  | (1.4) |  |  | (0.2) |  |  | (2.8) |
Recognized actuarial gain | (1.1) |  |  | (0.7) |  |  | (1.9) |  |  | (1.3) |
Net periodic benefit | $ | (23.1) |  |  | $ | (25.0) |  |  | $ | (46.1) |  |  | $ | (51.4) |

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