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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 643.1us-gaap_AccountsReceivableNetCurrent 646.1us-gaap_AccountsReceivableNetCurrent
Number of employees of PCA   14,000dei_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 39.2us-gaap_AccountsReceivableNetCurrent
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= pkg_OfficeDepotincludingOfficeMaxMember		 52.6us-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