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Retirement Plans and Postretirement Benefits | 9 Months Ended
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Sep. 30, 2024
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 September 30, |  | Nine Months Ended September 30, |  |
Pension Benefit Plans | 2024 | 2023 |  | 2024 | 2023 |  |  |
Service cost | $ | 0.6 |  | $ | 0.9 |  |  | $ | 1.9 |  | $ | 2.6 |  |  |  |
Interest cost | 3.0 |  | 3.1 |  |  | 8.9 |  | 9.3 |  |  |  |
Expected return on plan assets | (3.9) |  | (3.8) |  |  | (11.8) |  | (11.4) |  |  |  |
Net periodic cost | $ | (0.3) |  | $ | 0.2 |  |  | $ | (0.9) |  | $ | 0.6 |  |  |  |
|  |  | Quarter Ended September 30, |  | Nine Months Ended September 30, |  |
Other Postretirement Employee Benefit Plans |  |  |  |  | 2024 | 2023 |  | 2024 | 2023 |  |  |
Service cost |  |  |  |  | $ | 0.1 |  | $ | — |  |  | $ | 0.2 |  | $ | 0.1 |  |  |  |
Interest cost |  |  |  |  | 0.7 |  | 0.7 |  |  | 2.0 |  | 2.1 |  |  |  |
Amortization of actuarial gain |  |  |  |  | (0.1) |  | (0.1) |  |  | (0.2) |  | (0.4) |  |  |  |
Net periodic cost |  |  |  |  | $ | 0.6 |  | $ | 0.6 |  |  | $ | 2.0 |  | $ | 1.8 |  |  |  |
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" on our Consolidated Statements of Operations. For the quarter and nine months ended September 30, 2024, we recorded $0.6 million and $1.7 million to "Cost of sales" and $0.1 million and $0.4 million to "Selling, general, and administrative expenses." For the quarter and nine months ended September 30, 2023, we recorded $0.8 million and $2.3 million to "Cost of sales" and $0.1 million and $0.4 million to "Selling, general, and administrative expenses."

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