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Commitments and Contingencies - Additional Information (Details) (USD $) In Millions, unless otherwise specified | 2 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2010 | Dec. 31, 2014 acre | Dec. 31, 2013 | Dec. 31, 2012
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Capital commitments |  | $ 94.7 pkg_CapitalCommitments |  | $ 151.4 pkg_CapitalCommitments |
Area leased under timberland cutting rights (acres) |  | 88,000 pkg_AreaLeasedUnderTimberlandCuttingRights |  |  |
Average lease renewal term |  | 6 years |  |  |
Total lease expense |  | 85.6 us-gaap_LeaseAndRentalExpense |  | 56.0 us-gaap_LeaseAndRentalExpense | 49.4 us-gaap_LeaseAndRentalExpense
Capital lease obligations |  | 23.9 us-gaap_CapitalLeaseObligations |  | 24.9 us-gaap_CapitalLeaseObligations |
Interest paid, capital lease obligations |  | 1.6 us-gaap_InterestExpenseLesseeAssetsUnderCapitalLease |  | 1.7 us-gaap_InterestExpenseLesseeAssetsUnderCapitalLease | 1.7 us-gaap_InterestExpenseLesseeAssetsUnderCapitalLease
Purchases during period under purchase agreements |  | 265.9 pkg_CurrentPeriodPurchasesUnderLongTermPurchaseAgreements |  | 61.7 pkg_CurrentPeriodPurchasesUnderLongTermPurchaseAgreements | 27.7 pkg_CurrentPeriodPurchasesUnderLongTermPurchaseAgreements
Environmental remediation expense to date |  | 3.2 pkg_EnvironmentalRemediationExpenseToDate |  |  |
Environmental reserve |  | 35.4 us-gaap_AccrualForEnvironmentalLossContingencies |  |  |
Environmental liabilities and asset retirement obligations |  | 7.1 us-gaap_AccruedEnvironmentalLossContingenciesCurrent |  | 7.8 us-gaap_AccruedEnvironmentalLossContingenciesCurrent |
Number of other U.S. and Canadian containerboard producers | PCA and eight other U.S. and Canadian containerboard producers were named as defendants |  |  |  |
Number of lawsuits filed by the plaintiffs | 5 us-gaap_LossContingencyNewClaimsFiledNumber |  |  |  |
Class action lawsuit settlement |  | 17.6 us-gaap_GainLossRelatedToLitigationSettlement | [1] | 0 us-gaap_GainLossRelatedToLitigationSettlement | 0 us-gaap_GainLossRelatedToLitigationSettlement
Asset Retirement Obligation |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Environmental reserve |  | 26.9 us-gaap_AccrualForEnvironmentalLossContingencies / pkg_EnvironmentalLiabilityTypeAxis = pkg_AssetRetirementObligationMember |  |  |
Environmental Contingencies |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Environmental reserve |  | 8.5 us-gaap_AccrualForEnvironmentalLossContingencies / pkg_EnvironmentalLiabilityTypeAxis = pkg_EnvironmentalContingenciesMember |  |  |
Other Long-Term Liabilities |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Environmental reserve |  | $ 28.3 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_BalanceSheetLocationAxis = pkg_OtherLongTermLiabilitiesMember |  |  |
Minimum |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Remaining lease term |  | 1 year |  |  |
Purchase commitments term, years |  | 1 year |  |  |
Maximum |  |  |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |  |  |
Remaining lease term |  | 15 years |  |  |
Purchase commitments term, years |  | 20 years |  |  |
[1] | Includes $17.6 million of costs for the settlement of the Kleen Products LLC v Packaging Corp. of America et al class action lawsuit. See Note 20, Commitments, Guarantees, Indemnifications, and Legal Proceedings, for more information.

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