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v3.23.1

Retirement Benefits | 3 Months Ended
--- | ---
Mar. 31, 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 March 31, |  |
| 2023 |  | 2022 |  |  |  |
Components of net periodic (benefit) cost: |  |  |  |  |  |  |
Service cost | $ | 70.4 |  |  | $ | 89.1 |  |  |  |  |
Interest cost | 161.1 |  |  | 100.5 |  |  |  |  |
Expected return on plan assets | (263.3) |  |  | (239.5) |  |  |  |  |
Amortization of prior service cost | 0.6 |  |  | 0.7 |  |  |  |  |
Recognized actuarial loss | 30.0 |  |  | 87.0 |  |  |  |  |
Net periodic (benefit) cost | $ | (1.2) |  |  | $ | 37.8 |  |  |  |  |
| Retiree Health Benefit Plans
| Three Months Ended March 31, |  |
| 2023 |  | 2022 |  |  |  |
Components of net periodic benefit: |  |  |  |  |  |  |
Service cost | $ | 7.7 |  |  | $ | 11.2 |  |  |  |  |
Interest cost | 15.4 |  |  | 9.4 |  |  |  |  |
Expected return on plan assets | (45.5) |  |  | (37.9) |  |  |  |  |
Amortization of prior service benefit | (13.2) |  |  | (13.7) |  |  |  |  |
Recognized actuarial (gain) loss | (0.9) |  |  | 0.2 |  |  |  |  |
Net periodic benefit | $ | (36.5) |  |  | $ | (30.8) |  |  |  |  |

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