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Employee Benefit Plans and Other Postretirement Benefits | 9 Months Ended
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Sep. 30, 2024
Retirement Benefits [Abstract] |
Employee Benefit Plans and Other Postretirement Benefits | 13. Employee Benefit Plans and Other Postretirement Benefits The components of net periodic benefit cost for our pension plans were as follows (dollars in millions):
|  | Pension Plans |
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Service cost |  | $ | 2.9 |  |  | $ | 3.3 |  |  | $ | 9.2 |  |  | $ | 10.5 |
Interest cost |  |  | 13.8 |  |  |  | 13.8 |  |  |  | 41.5 |  |  |  | 41.9 |
Expected return on plan assets |  |  | (16.4 | ) |  |  | (14.2 | ) |  |  | (49.3 | ) |  |  | (42.8 | )
Net amortization of unrecognized amounts |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | 1.4 |  |  |  | 1.3 |  |  |  | 4.1 |  |  |  | 3.9 |
Actuarial loss |  |  | 0.1 |  |  |  | 1.0 |  |  |  | 0.5 |  |  |  | 3.1 |
Net periodic benefit cost |  | $ | 1.8 |  |  | $ | 5.2 |  |  | $ | 6.0 |  |  | $ | 16.6 |
PCA makes pension plan contributions that are sufficient to fund its actuarially determined costs, generally equal to the minimum amounts required by the Employee Retirement Income Security Act (ERISA). From time to time, PCA may make additional discretionary contributions based on the funded status of the plans, tax deductibility, income from operations, and other factors. During both the three and nine months ended September 30, 2024 and 2023, payments to our nonqualified pension plans were insignificant. During the three and nine months ended September 30, 2024 and 2023, we made contributions of $25.0 million and $50.0 million, respectively, to our qualified pension plans. We do no t have a required minimum contribution amount for 2024, but we made discretionary contributions to our plans during the three and nine months ended September 30, 2024. For both the three and nine months ended September 30, 2024 and 2023, the net periodic benefit cost for our postretirement plans was insignificant.

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