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Retirement Benefits | 9 Months Ended
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Sep. 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 September 30, |  | Nine Months Ended September 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic cost: |  |  |  |  |  |  |
Service cost | $ | 84.9 |  |  | $ | 72.5 |  |  | $ | 254.3 |  |  | $ | 217.8 |
Interest cost | 165.9 |  |  | 162.3 |  |  | 496.6 |  |  | 486.0 |
Expected return on plan assets | (278.8) |  |  | (264.0) |  |  | (834.3) |  |  | (791.5) |
Amortization of prior service cost | 0.6 |  |  | 0.6 |  |  | 1.6 |  |  | 1.8 |
Recognized actuarial loss | 31.4 |  |  | 30.6 |  |  | 93.8 |  |  | 91.5 |
Net periodic cost | $ | 4.0 |  |  | $ | 2.0 |  |  | $ | 12.0 |  |  | $ | 5.6 |
| Retiree Health Benefit Plans
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Components of net periodic benefit: |  |  |  |  |  |  |
Service cost | $ | 8.9 |  |  | $ | 7.9 |  |  | $ | 26.6 |  |  | $ | 23.8 |
Interest cost | 15.5 |  |  | 15.3 |  |  | 46.6 |  |  | 46.0 |
Expected return on plan assets | (48.0) |  |  | (45.5) |  |  | (144.1) |  |  | (136.6) |
Amortization of prior service benefit | (1.4) |  |  | (13.3) |  |  | (4.2) |  |  | (39.7) |
Recognized actuarial gain | (0.6) |  |  | (1.5) |  |  | (1.9) |  |  | (4.4) |
Net periodic benefit | $ | (25.6) |  |  | $ | (37.1) |  |  | $ | (77.0) |  |  | $ | (110.9) |

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