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Retirement Benefits | 6 Months Ended
--- | ---
Jun. 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 June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Components of net periodic benefit cost: |  |  |  |  |  |  |
Service cost | $ | 93.3 |  |  | $ | 83.0 |  |  | $ | 185.3 |  |  | $ | 161.7 |
Interest cost | 84.8 |  |  | 107.3 |  |  | 169.1 |  |  | 212.3 |
Expected return on plan assets | (237.2) |  |  | (220.6) |  |  | (475.2) |  |  | (441.8) |
Amortization of prior service cost | 1.1 |  |  | 1.1 |  |  | 2.2 |  |  | 2.2 |
Recognized actuarial loss | 122.6 |  |  | 117.1 |  |  | 244.4 |  |  | 228.1 |
Net periodic benefit cost | $ | 64.6 |  |  | $ | 87.9 |  |  | $ | 125.8 |  |  | $ | 162.5 |
| Retiree Health Benefit Plans
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Components of net periodic benefit income: |  |  |  |  |  |  |
Service cost | $ | 12.9 |  |  | $ | 10.6 |  |  | $ | 24.6 |  |  | $ | 20.4 |
Interest cost | 8.2 |  |  | 10.9 |  |  | 16.3 |  |  | 21.9 |
Expected return on plan assets | (36.5) |  |  | (37.4) |  |  | (73.1) |  |  | (74.8) |
Amortization of prior service benefit | (14.9) |  |  | (14.9) |  |  | (29.8) |  |  | (29.8) |
Recognized actuarial loss | 0.8 |  |  | 0.6 |  |  | 1.6 |  |  | 1.4 |
Net periodic benefit income | $ | (29.5) |  |  | $ | (30.2) |  |  | $ | (60.4) |  |  | $ | (60.9) |
We contributed approximately $20 million to satisfy minimum funding requirements to our defined benefit pension and retiree health benefit plans during the six months ended June 30, 2021. We contributed approximately $10 million in discretionary funding during the six months ended June 30, 2021. During the remainder of 2021, we expect to make contributions of approximately $10 million to our defined benefit pension and retiree health plans to satisfy minimum funding requirements.

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