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Employee Benefit Plans and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2015
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 June 30 |  | Six Months Ended June 30
| 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 6.0 |  |  | $ | 5.8 |  |  | $ | 11.8 |  |  | $ | 11.6 |
Interest cost | 11.5 |  |  | 11.5 |  |  | 23.0 |  |  | 22.9 |
Expected return on plan assets | (13.3 | ) |  | (12.7 | ) |  | (26.6 | ) |  | (25.4 | )
Net amortization of unrecognized amounts |  |  |  |  |  |  |
Prior service cost | 1.4 |  |  | 1.6 |  |  | 2.8 |  |  | 3.3 |
Actuarial loss | 2.2 |  |  | 0.2 |  |  | 4.3 |  |  | 0.3 |
Net periodic benefit cost | $ | 7.8 |  |  | $ | 6.4 |  |  | $ | 15.3 |  |  | $ | 12.7 |
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 six months ended June 30, 2015, we made payments of $0.8 million to our nonqualified pension plans. We have no required minimum qualified contributions in 2015. The components of net periodic benefit cost for our postretirement plans were as follows (dollars in millions):
| Postretirement Plans
| Three Months Ended June 30 |  | Six Months Ended June 30
| 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 0.4 |  |  | $ | 0.4 |  |  | $ | 0.8 |  |  | $ | 0.8 |
Interest cost | 0.3 |  |  | 0.3 |  |  | 0.6 |  |  | 0.6 |
Net amortization of unrecognized amounts |  |  |  |  |  |  |
Prior service cost | — |  |  | — |  |  | — |  |  | (0.1 | )
Actuarial loss | — |  |  | — |  |  | 0.1 |  |  | 0.1 |
Net periodic benefit cost | $ | 0.7 |  |  | $ | 0.7 |  |  | $ | 1.5 |  |  | $ | 1.4 |

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