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Employee Benefit Plans and Other Postretirement Benefits (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Pension Plans
Jun. 30, 2013
Pension Plans
Jun. 30, 2014
Pension Plans
Jun. 30, 2013
Pension Plans
Jun. 30, 2014
Postretirement Plans
Jun. 30, 2013
Postretirement Plans
Jun. 30, 2014
Postretirement Plans
Jun. 30, 2013
Postretirement Plans
Dec. 31, 2014
Scenario, Forecast
Defined Benefit Plan Disclosure [Line Items]                          
Service cost         $ 5,806,000 $ 6,249,000 $ 11,600,000 $ 12,497,000 $ 393,000 $ 515,000 $ 785,000 $ 1,030,000  
Interest cost         11,459,000 3,991,000 22,893,000 7,982,000 314,000 311,000 622,000 623,000  
Expected return on plan assets         (12,672,000) (3,751,000) (25,351,000) (7,501,000)          
Net amortization of unrecognized amounts, Prior service cost         1,640,000 1,560,000 3,281,000 3,121,000 (56,000) (106,000) (113,000) (212,000)  
Net amortization of unrecognized amounts, Actuarial loss         155,000 1,502,000 310,000 3,003,000 27,000 134,000 51,000 267,000  
Net amortization of unrecognized amounts, Curtailment loss 0 7,776,000 [1] 0 7,776,000 [1] 0 7,776,000 [2] 0 7,776,000 [2]          
Net periodic benefit cost         6,388,000 17,327,000 12,733,000 26,878,000 678,000 854,000 1,345,000 1,708,000  
Decrease in the benefit obligation           (13,800,000)              
Decrease in accumulated other comprehensive income (loss)           (8,400,000)              
Deferred taxes           (5,400,000)              
Pension Contributions [Abstract]                          
Expected pension contributions in 2014                         $ 5,000,000
[1] The three and six months ended June 30, 2013, both include $7.8 million of non-cash pension curtailment charges related to pension plan changes in which certain hourly corrugated plant employees transitioned from a defined benefit pension plan to a defined contribution (401k) plan.
[2] In June 2013, the United Steelworkers (“USW”) ratified a master labor agreement with PCA under which we froze certain USW-represented corrugated plant employees pension accruals under PCA’s hourly pension plan. As of the date of the pension freeze, affected USW-represented employees will transition to a defined contribution 401k plan. In accordance with ASC 715, “Compensation — Retirement Benefits,” we recorded a $7.8 million pre-tax pension curtailment charge related to the unrecognized prior service costs of employees impacted by the pension freeze during the second quarter of 2013. We also remeasured the hourly pension plan benefit obligation using current fair values of plan assets and current assumptions, resulting in a decrease in the benefit obligation of $13.8 million with a corresponding decrease in accumulated other comprehensive income (loss) of $8.4 million and deferred taxes of $5.4 million.