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Retirement Benefits | 6 Months Ended
--- | ---
Jun. 30, 2024
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,
| 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic cost: |  |  |  |  |  |  |
Service cost | $ | 85.6 |  |  | $ | 74.9 |  |  | $ | 169.4 |  |  | $ | 145.3 |
Interest cost | 165.7 |  |  | 162.6 |  |  | 330.7 |  |  | 323.7 |
Expected return on plan assets | (277.9) |  |  | (264.2) |  |  | (555.5) |  |  | (527.5) |
Amortization of prior service cost | 0.5 |  |  | 0.6 |  |  | 1.0 |  |  | 1.2 |
Recognized actuarial loss | 31.8 |  |  | 30.9 |  |  | 62.4 |  |  | 60.9 |
Net periodic cost | $ | 5.7 |  |  | $ | 4.8 |  |  | $ | 8.0 |  |  | $ | 3.6 |
| Retiree Health Benefit Plans
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic benefit: |  |  |  |  |  |  |
Service cost | $ | 9.5 |  |  | $ | 8.2 |  |  | $ | 17.7 |  |  | $ | 15.9 |
Interest cost | 15.6 |  |  | 15.3 |  |  | 31.1 |  |  | 30.7 |
Expected return on plan assets | (48.0) |  |  | (45.6) |  |  | (96.1) |  |  | (91.1) |
Amortization of prior service benefit | (1.4) |  |  | (13.2) |  |  | (2.8) |  |  | (26.4) |
Recognized actuarial gain | (0.7) |  |  | (2.0) |  |  | (1.3) |  |  | (2.9) |
Net periodic benefit | $ | (25.0) |  |  | $ | (37.3) |  |  | $ | (51.4) |  |  | $ | (73.8) |

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