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Employee Benefit Plans and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 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 June 30 |  | Six Months Ended June 30
| 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 6.1 |  |  | $ | 6.0 |  |  | $ | 12.2 |  |  | $ | 11.8 |
Interest cost | 10.2 |  |  | 11.5 |  |  | 20.4 |  |  | 23.0 |
Expected return on plan assets | (12.4 | ) |  | (13.3 | ) |  | (24.8 | ) |  | (26.6 | )
Net amortization of unrecognized amounts |  |  |  |  |  |  |
Prior service cost | 1.4 |  |  | 1.4 |  |  | 2.8 |  |  | 2.8 |
Actuarial loss | 1.4 |  |  | 2.2 |  |  | 2.8 |  |  | 4.3 |
Net periodic benefit cost | $ | 6.7 |  |  | $ | 7.8 |  |  | $ | 13.4 |  |  | $ | 15.3 |
In April 2016, the Company provided notice to eligible participants that the Salaried Retiree Medical Plan would be frozen as of December 31, 2016. As a result of the freeze, eligible plan participants who do not retire and elect coverage before December 31, 2016 lose benefits attributable to service already rendered. In accordance with Accounting Standards Codification (ASC) 715, "Compensation--Retirement Benefits", the Company remeasured the Salaried Retiree Medical Plan benefit obligation using current assumptions, resulting in a decrease in the benefit obligation of $5.1 million with a corresponding increase in accumulated other comprehensive income of $3.1 million and deferred income taxes of $2.0 million. 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 and six months ended June 30, 2016 and 2015 payments to our nonqualified pension plans were insignificant. We made a contribution of $3.7 million to our qualified plans during the three and six months ended June 30, 2016; however, we did not make a contribution to our qualified plans during the same periods in 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 June 30 |  | Six Months Ended June 30
| 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 0.2 |  |  | $ | 0.4 |  |  | $ | 0.4 |  |  | $ | 0.8 |
Interest cost | 0.2 |  |  | 0.3 |  |  | 0.4 |  |  | 0.6 |
Net amortization of unrecognized amounts |  |  |  |  |  |  |
Prior service cost | — |  |  | — |  |  | — |  |  | — |
Actuarial loss | (0.2 | ) |  | — |  |  | (0.4 | ) |  | 0.1 |
Net periodic benefit cost | $ | 0.2 |  |  | $ | 0.7 |  |  | $ | 0.4 |  |  | $ | 1.5 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963 + Details
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