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Retirement Benefits | 9 Months Ended
--- | ---
Sep. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Retirement Benefits | Retirement Benefits Net pension and retiree health benefit (income) cost included the following components:
| Defined Benefit Pension Plans
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Components of net periodic benefit cost: |  |  |  |  |  |  |
Service cost | $ | 92.5 |  |  | $ | 81.7 |  |  | $ | 277.8 |  |  | $ | 243.4 |
Interest cost | 84.5 |  |  | 106.6 |  |  | 253.6 |  |  | 319.0 |
Expected return on plan assets | (237.5) |  |  | (229.5) |  |  | (712.7) |  |  | (671.4) |
Amortization of prior service cost | 1.0 |  |  | 1.1 |  |  | 3.2 |  |  | 3.2 |
Recognized actuarial loss | 121.9 |  |  | 58.4 |  |  | 366.3 |  |  | 286.5 |
Net periodic benefit cost | $ | 62.4 |  |  | $ | 18.3 |  |  | $ | 188.2 |  |  | $ | 180.7 |
| Retiree Health Benefit Plans
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Components of net periodic benefit income: |  |  |  |  |  |  |
Service cost | $ | 12.4 |  |  | $ | 10.2 |  |  | $ | 37.0 |  |  | $ | 30.6 |
Interest cost | 8.1 |  |  | 10.9 |  |  | 24.4 |  |  | 32.8 |
Expected return on plan assets | (36.5) |  |  | (40.3) |  |  | (109.6) |  |  | (115.1) |
Amortization of prior service benefit | (14.9) |  |  | (21.9) |  |  | (44.7) |  |  | (51.6) |
Recognized actuarial loss | 0.8 |  |  | 0.7 |  |  | 2.4 |  |  | 2.1 |
Net periodic benefit income | $ | (30.1) |  |  | $ | (40.4) |  |  | $ | (90.5) |  |  | $ | (101.2) |

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