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Employee Benefit Plans and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2023
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 June 30, |  |  | Six Months Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Service cost |  | $ | 3.6 |  |  | $ | 4.9 |  |  | $ | 7.2 |  |  | $ | 9.9 |
Interest cost |  |  | 14.0 |  |  |  | 8.7 |  |  |  | 28.0 |  |  |  | 17.4 |
Expected return on plan assets |  |  | (14.3 | ) |  |  | (13.9 | ) |  |  | (28.6 | ) |  |  | (27.9 | )
Net amortization of unrecognized amounts |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | 1.3 |  |  |  | 0.9 |  |  |  | 2.6 |  |  |  | 1.8 |
Actuarial loss |  |  | 1.1 |  |  |  | 0.8 |  |  |  | 2.1 |  |  |  | 1.7 |
Net periodic benefit cost |  | $ | 5.7 |  |  | $ | 1.4 |  |  | $ | 11.3 |  |  | $ | 2.9 |
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 the three and six months ended June 30, 2023 and 2022, payments to our nonqualified pension plans were insignificant. During both the three and six months ended June 30, 2023 and 2022, we did no t make any contributions to our qualified pension plans. We do no t have a required minimum contribution amount for 2023, but we expect to make discretionary contributions to our plans. For both the three and six months ended June 30, 2023 and 2022, the net periodic benefit cost for our postretirement plans was insignificant.

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