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Segment Information - Analysis of Operations by Reportable Segment (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,852.6 us-gaap_SalesRevenueGoodsNet |  | $ 3,665.3 us-gaap_SalesRevenueGoodsNet | [1] | $ 2,843.9 us-gaap_SalesRevenueGoodsNet |  |
Net sales | 1,434.0 us-gaap_SalesRevenueNet | [2] | 1,518.9 us-gaap_SalesRevenueNet | [3] | 1,468.4 us-gaap_SalesRevenueNet | [4] | 1,431.3 us-gaap_SalesRevenueNet | [5] | 1,264.4 us-gaap_SalesRevenueNet | [6] | 845.5 us-gaap_SalesRevenueNet | [7] | 800.2 us-gaap_SalesRevenueNet | [8] | 755.2 us-gaap_SalesRevenueNet | 5,852.6 us-gaap_SalesRevenueNet |  | 3,665.3 us-gaap_SalesRevenueNet |  | 2,843.9 us-gaap_SalesRevenueNet |  |
Operating Income (Loss) | 173.2 us-gaap_OperatingIncomeLoss | [2] | 188.4 us-gaap_OperatingIncomeLoss | [3] | 180.2 us-gaap_OperatingIncomeLoss | [4] | 160.9 us-gaap_OperatingIncomeLoss | [5] | 122.9 us-gaap_OperatingIncomeLoss | [6] | 142.8 us-gaap_OperatingIncomeLoss | [7] | 110.2 us-gaap_OperatingIncomeLoss | [8] | 106.0 us-gaap_OperatingIncomeLoss | 702.7 us-gaap_OperatingIncomeLoss |  | 481.9 us-gaap_OperatingIncomeLoss | [1] | 437.6 us-gaap_OperatingIncomeLoss |  |
Interest expense, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (88.4)us-gaap_InterestIncomeExpenseNonoperatingNet | [9] | (58.3)us-gaap_InterestIncomeExpenseNonoperatingNet | [1],[10] | (62.9)us-gaap_InterestIncomeExpenseNonoperatingNet | [11] |
Income before taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 614.3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  | 423.6 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | [1] | 374.7 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest |  |
Depreciation, amortization, and depletion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 381.0 us-gaap_DepreciationDepletionAndAmortization |  | 201.8 us-gaap_DepreciationDepletionAndAmortization | [1] | 170.8 us-gaap_DepreciationDepletionAndAmortization |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 420.2 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | [12] | 234.4 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | [1],[12] | 128.5 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | [12] |
Assets | 5,348.5 us-gaap_Assets |  |  |  |  |  |  |  | 5,243.8 us-gaap_Assets | [1] |  |  |  |  |  | 5,348.5 us-gaap_Assets |  | 5,243.8 us-gaap_Assets | [1] | 2,494.9 us-gaap_Assets |  |
Class action lawsuit settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.6 us-gaap_GainLossRelatedToLitigationSettlement | [13] | 0 us-gaap_GainLossRelatedToLitigationSettlement |  | 0 us-gaap_GainLossRelatedToLitigationSettlement |  |
Write-Off of Deferred Financing Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1.5)us-gaap_InterestIncomeExpenseNonoperatingNet / pkg_TypeofCostAxis = pkg_WriteOffofDeferredFinancingCostsMember |  |  |  |  |  |
Packaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,534.5 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  | 3,431.3 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember | [1] | 2,843.9 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 663.2 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember | [14] | 554.2 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember | [1],[15] | 383.9 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember | [16] |
Depreciation, amortization, and depletion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 323.0 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  | 190.2 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember | [1] | 169.4 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 362.1 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember | [12] | 222.2 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember | [1],[12] | 127.8 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember | [12] |
Assets | 4,105.3 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  |  |  |  |  |  |  | 3,988.5 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember | [1] |  |  |  |  |  | 4,105.3 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  | 3,988.5 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember | [1] | 2,194.5 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  |
Paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,201.4 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |  | 216.9 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember | [1] |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135.4 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |  | 13.5 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember | [1],[17] |  |  |
Depreciation, amortization, and depletion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.6 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |  | 9.1 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember | [1] |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.7 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember | [12] | 10.0 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember | [1],[12] |  |  |
Assets | 968.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |  |  |  |  |  |  |  | 938.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember | [1] |  |  |  |  |  | 968.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |  | 938.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember | [1] |  |  |
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 116.7 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  | 17.1 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] | 0 us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (95.9)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [18] | (85.8)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1],[19] | 53.7 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [20] |
Depreciation, amortization, and depletion |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.4 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  | 2.5 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] | 1.4 us-gaap_DepreciationDepletionAndAmortization / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.4 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [12] | 2.2 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1],[12] | 0.7 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [12] |
Assets | 274.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |  |  |  |  |  |  | 316.9 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] |  |  |  |  |  | 274.6 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  | 316.9 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] | 300.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |
Class action lawsuit settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.6 us-gaap_GainLossRelatedToLitigationSettlement / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |  |  |  |  |
DeRidder Restructuring Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) | (18.0)us-gaap_OperatingIncomeLoss / pkg_NonrecurringActivityAxis = us-gaap_RestructuringChargesMember |  | (26.0)us-gaap_OperatingIncomeLoss / pkg_NonrecurringActivityAxis = us-gaap_RestructuringChargesMember |  | (17.8)us-gaap_OperatingIncomeLoss / pkg_NonrecurringActivityAxis = us-gaap_RestructuringChargesMember |  | (4.0)us-gaap_OperatingIncomeLoss / pkg_NonrecurringActivityAxis = us-gaap_RestructuringChargesMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Inventory Step-Up | Boise Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 21.5 us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_AcquisitionInventoryStepUpMember |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition Inventory Step-Up | Boise Inc. | Packaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (18.0)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_AcquisitionInventoryStepUpMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  |  |  |
Acquisition Inventory Step-Up | Boise Inc. | Paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3.5)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_AcquisitionInventoryStepUpMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |  |  |  |
Integration-Related and Other Costs | Boise Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) | (6.4)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_IntegrationRelatedandOtherCostsMember |  |  |  | (4.9)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_IntegrationRelatedandOtherCostsMember |  | (4.1)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_IntegrationRelatedandOtherCostsMember |  | (17.4)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_IntegrationRelatedandOtherCostsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Income before taxes |  |  | (4.5)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_IntegrationRelatedandOtherCostsMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Integration-Related and Other Costs | Boise Inc. | Packaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1.4)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_IntegrationRelatedandOtherCostsMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  |  |  |
Integration-Related and Other Costs | Boise Inc. | Paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.9 us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_IntegrationRelatedandOtherCostsMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |  |  |  |
Integration-Related and Other Costs | Boise Inc. | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (17.9)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_IntegrationRelatedandOtherCostsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |  |  |
Nonrecurring Acquisition-Related Costs | Boise Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | (15.8)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_NonrecurringAcquisitionRelatedCostsMember |  | (1.5)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_NonrecurringAcquisitionRelatedCostsMember |  |  |  |  |  |  |  |  |  |  |
Nonrecurring Acquisition-Related Costs | Boise Inc. | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (17.2)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_NonrecurringAcquisitionRelatedCostsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |  |  |
Acquisition-Related Debt Financing Costs | Boise Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  | (8.9)us-gaap_InterestIncomeExpenseNonoperatingNet / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_AcquisitionRelatedDebtFinancingCostsMember |  | (2.7)us-gaap_InterestIncomeExpenseNonoperatingNet / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_AcquisitionRelatedDebtFinancingCostsMember |  |  |  |  |  |  |  |  |  |  |
Acquisition-Related Debt Financing Costs | Boise Inc. | Acquisition Financing Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (10.5)us-gaap_InterestIncomeExpenseNonoperatingNet / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_AcquisitionRelatedDebtFinancingCostsMember / pkg_TypeofCostAxis = pkg_AcquisitionFinancingExpenseMember |  |  |  |
Acquisition-Related Debt Financing Costs | Boise Inc. | Write-Off of Deferred Financing Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1.1)us-gaap_InterestIncomeExpenseNonoperatingNet / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / pkg_NonrecurringActivityAxis = pkg_AcquisitionRelatedDebtFinancingCostsMember / pkg_TypeofCostAxis = pkg_WriteOffofDeferredFinancingCostsMember |  |  |  |
Plant Closure | Packaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2.0)us-gaap_OperatingIncomeLoss / pkg_NonrecurringActivityAxis = pkg_PlantClosureAndOtherMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  |
Debt Refinancing Charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (24.8)us-gaap_InterestIncomeExpenseNonoperatingNet / pkg_NonrecurringActivityAxis = pkg_DebtRefinancingChargesMember |  |
Debt Refinancing Charges | Redemption Premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Alternative Energy Tax Credits | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative energy tax credits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 95.5 pkg_AlternativeFuelMixtureCredits / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember / us-gaap_TaxCreditCarryforwardAxis = pkg_AlternativeFuelMixtureCreditsMember
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Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Intersegment Eliminations | Packaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,852.6 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |  | 3,665.3 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | [1] | 2,843.9 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember |  |
Operating Segments | Packaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,540.3 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  | 3,431.7 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember | [1] | 2,843.9 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  |
Operating Segments | Paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,201.4 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |  | 216.9 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember | [1] | 0 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |  |
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Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 261.6 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  | 45.1 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | [1] | 0 us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intersegment sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (150.7)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  | (28.4)us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | [1] |  |  |
Net sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (150.7)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember |  | (28.4)us-gaap_SalesRevenueNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember | [1] |  |  |
Other Expense | DeRidder Restructuring Costs | Packaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (65.8)us-gaap_OperatingIncomeLoss / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / pkg_NonrecurringActivityAxis = us-gaap_RestructuringChargesMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  |  |  |  |  |
Other Expense | Integration-Related and Other Costs | Boise Inc. | Packaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4.9)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / pkg_NonrecurringActivityAxis = pkg_IntegrationRelatedandOtherCostsMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  |  |  |  |  |
Other Expense | Integration-Related and Other Costs | Boise Inc. | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (13.5)us-gaap_OperatingIncomeLoss / us-gaap_BusinessAcquisitionAxis = pkg_BoiseInc.Member / us-gaap_IncomeStatementLocationAxis = us-gaap_OtherExpenseMember / pkg_NonrecurringActivityAxis = pkg_IntegrationRelatedandOtherCostsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |  |  |  |  |  |
[1] | On October 25, 2013, we acquired Boise Inc. (Boise). Our financial results include Boise subsequent to acquisition.
[2] | Includes $18.0 million of DeRidder restructuring charges ($11.7 million after-tax or $0.12 per diluted share) and $6.4 million of integration-related and other costs ($4.2 million after-tax or $0.04 per diluted share).
[3] | Includes $26.0 million of DeRidder restructuring charges ($16.6 million after-tax or $0.17 per diluted share) and $4.5 million of integration-related and other costs ($2.9 million after-tax or $0.03 per diluted share).
[4] | Includes $17.8 million of DeRidder restructuring charges ($11.2 million after-tax or $0.12 per diluted share) and $4.9 million of integration-related and other costs ($3.0 million after-tax or $0.03 per diluted share).
[5] | Includes $17.6 million of costs accrued for the settlement of the Kleen Products LLC v Packaging Corp. of America et al class action lawsuit ($11.2 million after-tax or $0.11 per diluted share), $4.1 million of integration-related costs ($2.6 million after-tax or $0.03 per diluted share), and $4.0 million of DeRidder restructuring charges ($2.6 million after-tax or $0.02 per diluted share).
[6] | Includes Boise's results for the period of October 25, 2013, through December 31, 2013. The quarter also includes $166.0 million of income tax benefits from the reversal of the reserves for unrecognized tax benefits from alternative energy tax credits ($1.70 per diluted share), partially offset by $21.5 million of expense for the acquisition inventory step-up ($13.6 million after-tax or $0.14 per diluted share), $15.8 million of acquisition-related costs ($10.0 million after-tax or $0.10 per diluted share), $8.9 million of acquisition-related financing costs ($5.6 million after-tax or $0.06 per diluted share), and $17.4 million of integration-related and other costs ($11.0 million after-tax or $0.11 per diluted share).
[7] | Includes a $3.1 million non-cash pension curtailment charge ($2.0 million after-tax or $0.02 per diluted share), $1.5 million of acquisition-related costs ($1.0 million after-tax or $0.01 per diluted share), and $2.7 million of acquisition-related financing costs ($1.8 million after-tax or $0.02 per diluted share).
[8] | Includes a $7.8 million non-cash pension curtailment charge ($5.0 million after-tax or $0.05 per diluted share).
[9] | Includes $1.5 million of expense related to the write-off of deferred financing costs in connection with the debt refinancing discussed in Note 10, Debt.
[10] | Includes $10.5 million of expenses for financing the acquisition and $1.1 million of expense for the write-off of deferred financing costs.
[11] | Includes $24.8 million of debt refinancing charges, including a $21.3 million redemption premium, a $3.4 million charge to settle the treasury lock prior to its maturity, and $0.1 million of other items.
[12] | Includes "Additions to property, plant, and equipment" and excludes cash used for "Acquisitions of businesses, net of cash acquired" as reported on our Consolidated Statements of Cash Flows.
[13] | 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.
[14] | Includes $65.8 million of costs related primarily to the conversion of the No. 3 newsprint machine at our DeRidder, Louisiana, mill to produce lightweight linerboard and corrugating medium, and our exit from the newsprint business in September 2014. Includes $4.9 million of Boise acquisition integration-related and other costs, most of which are recorded in "Other expense, net".
[15] | Includes $18.0 million of expense for the acquisition inventory step-up and $1.4 million of integration-related and other costs incurred in connection with the acquisition of Boise in fourth quarter 2013.
[16] | Includes $2.0 million of plant closure charges.
[17] | Includes $3.5 million of expense for acquisition inventory step-up and $1.9 million of income for integration-related and other costs.
[18] | Includes $13.5 million of Boise acquisition integration-related and other costs, most of which are recorded in "Other expense, net". Includes $17.6 million of costs for the settlement of the Kleen Products LLC v Packaging Corp. of America et al class action lawsuit recorded in "Other expense, net". See Note 20, Commitments, Guarantees, Indemnifications, and Legal Proceedings, for more information.
[19] | Includes $17.2 million of acquisition-related costs and $17.9 million of integration-related and other costs.
[20] | Includes $95.5 million of income related to the increase in gallons claimed as alternative energy tax credits on the Company's amended 2009 tax return. See Note 7, Alternative Energy Tax Credits, for more information.

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