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Employee Benefit Plans and Other Postretirement Benefits | 3 Months Ended
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Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Employee Benefit Plans and Other Postretirement Benefits | 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
| 2016 |  | 2015
Service cost | $ | 6.1 |  |  | $ | 5.9 |
Interest cost | 10.2 |  |  | 11.5 |
Expected return on plan assets | (12.4 | ) |  | (13.3 | )
Net amortization of unrecognized amounts |  |  |
Prior service cost | 1.4 |  |  | 1.4 |
Actuarial loss | 1.4 |  |  | 2.1 |
Net periodic benefit cost | $ | 6.7 |  |  | $ | 7.6 |
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). During the three months ended March 31, 2016 and 2015 payments to our nonqualified pension plans were insignificant. We did not make any contributions to our qualified plans during the three months ended March 31, 2016 and 2015. We expect to contribute at least the estimated required minimum contributions to our qualified plans of approximately $27.0 million in 2016. The components of net periodic benefit cost for our postretirement plans were as follows (dollars in millions):
| Postretirement Plans
| Three Months Ended March 31
| 2016 |  | 2015
Service cost | $ | 0.2 |  |  | $ | 0.4 |
Interest cost | 0.2 |  |  | 0.3 |
Net amortization of unrecognized amounts |  |  |
Prior service cost | — |  |  | — |
Actuarial loss | (0.2 | ) |  | 0.1 |
Net periodic benefit cost | $ | 0.2 |  |  | $ | 0.8 |

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