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Pension and Postretirement Health and Life Benefits | 6 Months Ended
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Jun. 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 June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Service costs | $ | 0.7 |  |  | $ | 0.9 |  |  | $ | 1.5 |  |  | $ | 1.8 |
Interest costs | 4.5 |  |  | 6.0 |  |  | 9.0 |  |  | 12.1 |
Amortization of prior service costs (credits), net | — |  |  | — |  |  | (0.1) |  |  | (0.1) |
Expected return on plan assets (gains) | (9.6) |  |  | (9.4) |  |  | (19.2) |  |  | (18.8) |
Net periodic benefit (credits) | $ | (4.4) |  |  | $ | (2.5) |  |  | $ | (8.8) |  |  | $ | (5.0) |
The components of net periodic benefit costs for the postretirement health and life benefit plans were as follows (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Interest costs | $ | 0.8 |  |  | $ | 1.2 |  |  | $ | 1.7 |  |  | $ | 2.4 |
Net periodic benefit costs | $ | 0.8 |  |  | $ | 1.2 |  |  | $ | 1.7 |  |  | $ | 2.4 |
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).

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