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Acquisitions (Narrative) (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Oct. 25, 2013
Apr. 28, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Acquisition [Line Items]          
Goodwill $ 546,800,000us-gaap_Goodwill     $ 526,800,000us-gaap_Goodwill $ 67,200,000us-gaap_Goodwill
Adjustments related to purchase accounting 7,800,000us-gaap_GoodwillPurchaseAccountingAdjustments [1]        
Boise Inc.          
Business Acquisition [Line Items]          
Business acquisition, cost of acquired entity   2,100,000,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= pkg_BoiseInc.Member		      
Outstanding stock and voting equity interests acquired   100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= pkg_BoiseInc.Member		      
Outstanding common stock acquired, price per share   $ 12.55us-gaap_BusinessAcquisitionSharePrice
/ us-gaap_BusinessAcquisitionAxis
= pkg_BoiseInc.Member		      
Business acquisition, cost of acquired entity, cash paid   1,200,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= pkg_BoiseInc.Member		      
Cash acquired from acquisition   121,700,000us-gaap_CashAcquiredFromAcquisition
/ us-gaap_BusinessAcquisitionAxis
= pkg_BoiseInc.Member		      
Business acquisition, debt assumed   829,800,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= pkg_BoiseInc.Member		      
Adjustments related to purchase accounting 6,400,000us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_BusinessAcquisitionAxis
= pkg_BoiseInc.Member		        
Packaging          
Business Acquisition [Line Items]          
Goodwill 491,600,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pkg_PackagingMember		     472,900,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pkg_PackagingMember		 67,200,000us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pkg_PackagingMember
Adjustments related to purchase accounting 6,500,000us-gaap_GoodwillPurchaseAccountingAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= pkg_PackagingMember		 [1]        
Packaging | Crockett Packaging          
Business Acquisition [Line Items]          
Business acquisition, cost of acquired entity     21,200,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= pkg_CrockettPackagingMember
/ us-gaap_StatementBusinessSegmentsAxis
= pkg_PackagingMember		    
Working capital adjustments     700,000us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred
/ us-gaap_BusinessAcquisitionAxis
= pkg_CrockettPackagingMember
/ us-gaap_StatementBusinessSegmentsAxis
= pkg_PackagingMember		    
Goodwill 12,200,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= pkg_CrockettPackagingMember
/ us-gaap_StatementBusinessSegmentsAxis
= pkg_PackagingMember		        
Intangible assets acquired $ 5,500,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= pkg_CrockettPackagingMember
/ us-gaap_StatementBusinessSegmentsAxis
= pkg_PackagingMember		        
Acquired finite-lived intangible assets, weighted average useful life 10 years        
[1] Adjustments relate primarily to the Boise acquisition, see Note 3, Acquisitions, for more information.