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Retirement Plans and Postretirement Benefits | 6 Months Ended
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Jun. 30, 2025
Postemployment Benefits [Abstract] |
Pension and Other Postretirement Employee Benefit Plans | Retirement Plans and Postretirement Benefits The following table details the components of net periodic cost of our company-sponsored pension and other postretirement employee benefit plans for the periods presented:
| Quarter Ended June 30, |  | Six Months Ended June 30,
Pension Benefit Plans | 2025 | 2024 |  | 2025 | 2024
Service cost | $ | 0.8 |  | $ | 0.6 |  |  | $ | 1.5 |  | $ | 1.3 |
Interest cost | 3.0 |  | 3.0 |  |  | 5.9 |  | 5.9 |
Expected return on plan assets | (3.3) |  | (3.9) |  |  | (6.7) |  | (7.9) |
Amortization of actuarial loss | 0.2 |  | — |  |  | 0.4 |  | 0.1 |
Net periodic cost | $ | 0.6 |  | $ | (0.3) |  |  | $ | 1.2 |  | $ | (0.6) |
| Quarter Ended June 30, |  | Six Months Ended June 30,
Other Postretirement Employee Benefit Plans | 2025 | 2024 |  | 2025 | 2024
Service cost | $ | — |  | $ | 0.1 |  |  | $ | 0.1 |  | $ | 0.1 |
Interest cost | 0.6 |  | 0.7 |  |  | 1.2 |  | 1.3 |
Amortization of actuarial gain | (0.1) |  | (0.1) |  |  | (0.3) |  | (0.1) |
Net periodic cost | $ | 0.5 |  | $ | 0.6 |  |  | $ | 1.0 |  | $ | 1.3 |
We record the service component of net periodic cost as part of "Cost of sales" and "Selling, general, and administrative expenses," while the non-service component of net periodic cost is recorded in "Other non-operating income (expense)" on our Consolidated Statements of Operations. For the quarter and six months ended June 30, 2025, we recorded $0.7 million and $1.3 million to "Cost of sales" and $0.1 million and $0.3 million to "Selling, general, and administrative expenses." For the quarter and six months ended June 30, 2024, we recorded $0.5 million and $1.0 million to "Cost of sales," $0.1 million and $0.3 million to "Selling, general, and administrative expenses," and $0.1 million to Discontinued Operations.

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