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Concentrations of Risk (Details) (USD $) In Millions, unless otherwise specified | 2 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014
Concentration Risk [Line Items] |  |
Accounts Receivable, Net, Current | 643.1 us-gaap_AccountsReceivableNetCurrent | 646.1 us-gaap_AccountsReceivableNetCurrent
Number of employees of PCA |  | 14,000 dei_EntityNumberOfEmployees
Percentage of hourly employees represented by unions |  | 75.00%pkg_PercentageOfHourlyEmployeesRepresentedByUnions
Workforce Subject to Collective Bargaining Arrangements |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage |  | 50.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsMember
Workforce Subject to Collective Bargaining Arrangements Expiring within One Year |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage |  | 16.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_WorkforceSubjectToCollectiveBargainingArrangementsExpiringWithinOneYearMember
Office Depot (including OfficeMax) | Credit Concentration Risk |  |
Concentration Risk [Line Items] |  |
Accounts Receivable, Net, Current | 39.2 us-gaap_AccountsReceivableNetCurrent / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_MajorCustomersAxis = pkg_OfficeDepotincludingOfficeMaxMember | 52.6 us-gaap_AccountsReceivableNetCurrent / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CreditConcentrationRiskMember / us-gaap_MajorCustomersAxis = pkg_OfficeDepotincludingOfficeMaxMember
Office Depot (including OfficeMax) | Total Company Sales Revenue | Customer Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 2.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = pkg_OfficeDepotincludingOfficeMaxMember | 9.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueGoodsNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = pkg_OfficeDepotincludingOfficeMaxMember
Office Depot (including OfficeMax) | Total Company Receivables | Customer Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 6.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = pkg_OfficeDepotincludingOfficeMaxMember | 8.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = pkg_OfficeDepotincludingOfficeMaxMember
Paper | Office Depot (including OfficeMax) | Paper Segment Sales Revenue | Customer Concentration Risk |  |
Concentration Risk [Line Items] |  |
Concentration risk, percentage | 38.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueSegmentMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = pkg_OfficeDepotincludingOfficeMaxMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember | 44.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueSegmentMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = pkg_OfficeDepotincludingOfficeMaxMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3-4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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