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Employee Benefit Plans and Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 2022
Retirement Benefits [Abstract] |
Employee Benefit Plans and Other Postretirement Benefits | 14. 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 March 31, |
|  | 2022 |  |  | 2021 |
Service cost |  | $ | 4.9 |  |  | $ | 5.4 |
Interest cost |  |  | 8.7 |  |  |  | 7.4 |
Expected return on plan assets |  |  | (13.9 | ) |  |  | (15.8 | )
Net amortization of unrecognized amounts |  |  |  |  |  |
Prior service cost |  |  | 0.9 |  |  |  | 1.0 |
Actuarial loss |  |  | 0.8 |  |  |  | 2.5 |
Net periodic benefit cost |  | $ | 1.4 |  |  | $ | 0.5 |
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 months ended March 31, 2022 and 2021, payments to our nonqualified pension plans were insignificant. During both the three months ended March 31, 2022 and 2021, we did no t make any contributions to our qualified pension plans. We do not have a required minimum contribution amount for 2022, but we expect to make discretionary contributions to our plans. For both the three months ended March 31, 2022 and 2021, the net periodic benefit cost for our postretirement plans was insignificant.

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