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Segment Informaiton - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 2 Months Ended 0 Months Ended
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
Dec. 31, 2013
Oct. 25, 2013
Segment Reporting Information [Line Items]                          
Number of reportable segments                 3us-gaap_NumberOfReportableSegments        
Net sales $ 1,434.0us-gaap_SalesRevenueNet [1] $ 1,518.9us-gaap_SalesRevenueNet [2] $ 1,468.4us-gaap_SalesRevenueNet [3] $ 1,431.3us-gaap_SalesRevenueNet [4] $ 1,264.4us-gaap_SalesRevenueNet [5] $ 845.5us-gaap_SalesRevenueNet [6] $ 800.2us-gaap_SalesRevenueNet [7] $ 755.2us-gaap_SalesRevenueNet $ 5,852.6us-gaap_SalesRevenueNet $ 3,665.3us-gaap_SalesRevenueNet $ 2,843.9us-gaap_SalesRevenueNet    
Packaging                          
Segment Reporting Information [Line Items]                          
Long-lived assets held by foreign operations 12.4us-gaap_NoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= pkg_PackagingMember		       14.0us-gaap_NoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= pkg_PackagingMember		       12.4us-gaap_NoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= pkg_PackagingMember		 14.0us-gaap_NoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= pkg_PackagingMember		   14.0us-gaap_NoncurrentAssets
/ us-gaap_StatementBusinessSegmentsAxis
= pkg_PackagingMember		  
Office Depot (including OfficeMax) | Customer Concentration Risk | Paper Segment Sales Revenue | Paper                          
Segment Reporting Information [Line Items]                          
Concentration risk, percentage                 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		     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		  
Foreign operations                          
Segment Reporting Information [Line Items]                          
Net sales                 378.8us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= pkg_ForeignOperationsMember		 162.4us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= pkg_ForeignOperationsMember		 115.8us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= pkg_ForeignOperationsMember		    
Boise Inc.                          
Segment Reporting Information [Line Items]                          
Business acquisition, cost of acquired entity                         $ 2,100.0us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= pkg_BoiseInc.Member
[1] 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).
[2] 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).
[3] 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).
[4] 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).
[5] 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).
[6] 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).
[7] Includes a $7.8 million non-cash pension curtailment charge ($5.0 million after-tax or $0.05 per diluted share).