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Retirement Benefits | 3 Months Ended
--- | ---
Mar. 31, 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 March 31, |  |
| 2021 |  | 2020 |  |  |  |
Components of net periodic benefit cost: |  |  |  |  |  |  |
Service cost | $ | 92.0 |  |  | $ | 78.7 |  |  |  |  |
Interest cost | 84.3 |  |  | 105.0 |  |  |  |  |
Expected return on plan assets | (238.0) |  |  | (221.2) |  |  |  |  |
Amortization of prior service cost | 1.1 |  |  | 1.1 |  |  |  |  |
Recognized actuarial loss | 121.8 |  |  | 111.0 |  |  |  |  |
Net periodic benefit cost | $ | 61.2 |  |  | $ | 74.6 |  |  |  |  |
| Retiree Health Benefit Plans
| Three Months Ended March 31, |  |
| 2021 |  | 2020 |  |  |  |
Components of net periodic benefit income: |  |  |  |  |  |  |
Service cost | $ | 11.7 |  |  | $ | 9.8 |  |  |  |  |
Interest cost | 8.1 |  |  | 11.0 |  |  |  |  |
Expected return on plan assets | (36.6) |  |  | (37.4) |  |  |  |  |
Amortization of prior service benefit | (14.9) |  |  | (14.9) |  |  |  |  |
Recognized actuarial loss | 0.8 |  |  | 0.8 |  |  |  |  |
Net periodic benefit income | $ | (30.9) |  |  | $ | (30.7) |  |  |  |  |
We contributed approximately $15 million to satisfy minimum funding requirements to our defined benefit pension and retiree health benefit plans during the three months ended March 31, 2021. We contributed approximately $10 million in discretionary funding during the three months ended March 31, 2021. During the remainder of 2021, we expect to make contributions of approximately $20 million to our defined benefit pension and retiree health plans to satisfy minimum funding requirements.

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