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Pension and Postretirement Health and Life Benefits | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits, Description [Abstract] |
Pension and Postretirement Health and Life Benefits | PENSION AND POSTRETIREMENT HEALTH AND LIFE BENEFITS The components of net periodic benefit (credits) for the defined benefit pension plans were as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Service costs | $ | 0.6 |  |  | $ | 0.9 |  |  | $ | 2.0 |  |  | $ | 2.7 |
Interest costs | 4.6 |  |  | 6.0 |  |  | 13.6 |  |  | 18.2 |
Amortization of prior service costs (credits), net | (0.1) |  |  | — |  |  | (0.1) |  |  | (0.2) |
Expected return on plan assets (gains) | (9.6) |  |  | (9.3) |  |  | (28.8) |  |  | (28.1) |
Net periodic benefit (credits) | $ | (4.5) |  |  | $ | (2.4) |  |  | $ | (13.3) |  |  | $ | (7.4) |
The components of net periodic benefit costs for the postretirement health and life benefit plans were as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Interest costs | $ | 0.9 |  |  | $ | 1.2 |  |  | $ | 2.6 |  |  | $ | 3.6 |
Amortization of prior service costs (credits), net | — |  |  | (0.1) |  |  | (0.1) |  |  | (0.1) |
Net periodic benefit costs | $ | 0.9 |  |  | $ | 1.1 |  |  | $ | 2.5 |  |  | $ | 3.5 |
The Company reports service costs for its defined benefit pension plans and its postretirement health and life benefit plans in Cost of Sales and Selling, General and Administrative Expenses. The remaining components of net periodic benefit (credits) costs are reported as Nonoperating Components of Net Periodic Benefit Expense (Income). Refer to Note 2, Revenue and Contracts with Customers, for details regarding the receipt of $43.5 million in September 2021 related to the settlement of the Company’s claims for reimbursements for certain pension and postretirement benefits costs incurred in connection with a past cost-reimbursable contract with DOE unrelated to the HALEU Contract. Under the terms of the settlement, the Company deposited $33.8 million in September 2021 in the pension plan for its subsidiary United States Enrichment Corp. (“Enrichment Corp.”) and $9.7 million in October 2021 in a trust for payment of postretirement health benefits payable by Enrichment Corp.

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