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v3.25.1

Retirement Benefits | 3 Months Ended
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Mar. 31, 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 March 31, |  |
| 2025 |  | 2024 |  |  |  |
Components of net periodic cost: |  |  |  |  |  |  |
Service cost | $ | 83.7 |  |  | $ | 83.8 |  |  |  |  |
Interest cost | 172.8 |  |  | 165.0 |  |  |  |  |
Expected return on plan assets | (269.5) |  |  | (277.6) |  |  |  |  |
Amortization of prior service cost | 0.5 |  |  | 0.5 |  |  |  |  |
Recognized actuarial loss | 20.9 |  |  | 30.6 |  |  |  |  |
Net periodic cost | $ | 8.4 |  |  | $ | 2.3 |  |  |  |  |
| Retiree Health Benefit Plans
| Three Months Ended March 31, |  |
| 2025 |  | 2024 |  |  |  |
Components of net periodic benefit: |  |  |  |  |  |  |
Service cost | $ | 8.3 |  |  | $ | 8.2 |  |  |  |  |
Interest cost | 15.8 |  |  | 15.5 |  |  |  |  |
Expected return on plan assets | (46.2) |  |  | (48.1) |  |  |  |  |
Amortization of prior service benefit | (0.1) |  |  | (1.4) |  |  |  |  |
Recognized actuarial gain | (0.8) |  |  | (0.6) |  |  |  |  |
Net periodic benefit | $ | (23.0) |  |  | $ | (26.4) |  |  |  |  |

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