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v3.23.2

Retirement Benefits | 6 Months Ended
--- | ---
Jun. 30, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [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,
| 2023 |  | 2022 |  | 2023 |  | 2022
Components of net periodic cost: |  |  |  |  |  |  |
Service cost | $ | 74.9 |  |  | $ | 88.2 |  |  | $ | 145.3 |  |  | $ | 177.3 |
Interest cost | 162.6 |  |  | 99.6 |  |  | 323.7 |  |  | 200.1 |
Expected return on plan assets | (264.2) |  |  | (237.0) |  |  | (527.5) |  |  | (476.5) |
Amortization of prior service cost | 0.6 |  |  | 0.6 |  |  | 1.2 |  |  | 1.3 |
Recognized actuarial loss | 30.9 |  |  | 84.5 |  |  | 60.9 |  |  | 171.5 |
Net periodic cost | $ | 4.8 |  |  | $ | 35.9 |  |  | $ | 3.6 |  |  | $ | 73.7 |
| Retiree Health Benefit Plans
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Components of net periodic benefit: |  |  |  |  |  |  |
Service cost | $ | 8.2 |  |  | $ | 12.1 |  |  | $ | 15.9 |  |  | $ | 23.3 |
Interest cost | 15.3 |  |  | 9.6 |  |  | 30.7 |  |  | 19.0 |
Expected return on plan assets | (45.6) |  |  | (38.2) |  |  | (91.1) |  |  | (76.1) |
Amortization of prior service benefit | (13.2) |  |  | (13.7) |  |  | (26.4) |  |  | (27.4) |
Recognized actuarial (gain) loss | (2.0) |  |  | 0.3 |  |  | (2.9) |  |  | 0.5 |
Net periodic benefit | $ | (37.3) |  |  | $ | (29.9) |  |  | $ | (73.8) |  |  | $ | (60.7) |

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