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Summary of Significant Accounting Policies - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 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
acre
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary of Significant Accounting Policies [Line Items]                        
Research and development costs                 $ 12.3us-gaap_ResearchAndDevelopmentExpense $ 11.5us-gaap_ResearchAndDevelopmentExpense $ 11.3us-gaap_ResearchAndDevelopmentExpense  
Cash and cash equivalents 124.9us-gaap_CashAndCashEquivalentsAtCarryingValue       191.0us-gaap_CashAndCashEquivalentsAtCarryingValue       124.9us-gaap_CashAndCashEquivalentsAtCarryingValue 191.0us-gaap_CashAndCashEquivalentsAtCarryingValue 207.4us-gaap_CashAndCashEquivalentsAtCarryingValue 156.3us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash equivalents 79.9us-gaap_CashEquivalentsAtCarryingValue       156.6us-gaap_CashEquivalentsAtCarryingValue       79.9us-gaap_CashEquivalentsAtCarryingValue 156.6us-gaap_CashEquivalentsAtCarryingValue    
Allowance for doubtful accounts 4.9us-gaap_AllowanceForDoubtfulAccountsReceivable       3.9us-gaap_AllowanceForDoubtfulAccountsReceivable       4.9us-gaap_AllowanceForDoubtfulAccountsReceivable 3.9us-gaap_AllowanceForDoubtfulAccountsReceivable    
Customer returns, allowances and earned discounts as a percentage of gross selling price                 1.00%pkg_PercentageOfCustomerReturnsAllowancesAndEarnedDiscountsToGrossSellingPrice      
Reserve for customer accounts receivable, percentage                 1.00%pkg_ReservePercentageForCustomerDeductions      
Reserve for customer deductions                 6.4pkg_ReserveForCustomerDeductions 6.7pkg_ReserveForCustomerDeductions    
Net income 98.5us-gaap_NetIncomeLoss [1] 104.4us-gaap_NetIncomeLoss [2] 99.6us-gaap_NetIncomeLoss [3] 90.1us-gaap_NetIncomeLoss [4] 228.1us-gaap_NetIncomeLoss [5] 84.7us-gaap_NetIncomeLoss [6] 66.2us-gaap_NetIncomeLoss [7] 62.3us-gaap_NetIncomeLoss 392.6us-gaap_NetIncomeLoss 441.3us-gaap_NetIncomeLoss 160.2us-gaap_NetIncomeLoss  
Inventories 664.9us-gaap_InventoryNet       594.3us-gaap_InventoryNet       664.9us-gaap_InventoryNet 594.3us-gaap_InventoryNet    
Retained earnings 1,242.2us-gaap_RetainedEarningsAccumulatedDeficit       1,019.1us-gaap_RetainedEarningsAccumulatedDeficit       1,242.2us-gaap_RetainedEarningsAccumulatedDeficit 1,019.1us-gaap_RetainedEarningsAccumulatedDeficit    
Interest capitalization, construction in progress                 2.8us-gaap_InterestCostsCapitalized 1.7us-gaap_InterestCostsCapitalized 0.8us-gaap_InterestCostsCapitalized  
Intangible asset, useful life, in years                 14 years 2 months 8 days 15 years 4 months 10 days    
Goodwill 546.8us-gaap_Goodwill       526.8us-gaap_Goodwill       546.8us-gaap_Goodwill 526.8us-gaap_Goodwill 67.2us-gaap_Goodwill  
Area leased under timberland cutting rights (acres)                 88,000pkg_AreaLeasedUnderTimberlandCuttingRights      
Area leased where fiber farms are operated (acres)                 9,000pkg_AreaLeasedWhereFiberFarmsAreOperated      
Software amortization expense                 2.9us-gaap_CapitalizedComputerSoftwareAmortization 1.1us-gaap_CapitalizedComputerSoftwareAmortization 0.9us-gaap_CapitalizedComputerSoftwareAmortization  
Minimum                        
Summary of Significant Accounting Policies [Line Items]                        
Term of senior credit facilities and notes, in years                 5pkg_TermOfSeniorCreditFacilitiesAndNotes
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		      
Maximum                        
Summary of Significant Accounting Policies [Line Items]                        
Term of senior credit facilities and notes, in years                 10pkg_TermOfSeniorCreditFacilitiesAndNotes
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		      
Foreign operations                        
Summary of Significant Accounting Policies [Line Items]                        
Cash and cash equivalents 10.4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= pkg_ForeignOperationsMember		       7.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= pkg_ForeignOperationsMember		       10.4us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= pkg_ForeignOperationsMember		 7.1us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementGeographicalAxis
= pkg_ForeignOperationsMember		    
Customer Relationships                        
Summary of Significant Accounting Policies [Line Items]                        
Intangible asset, useful life, in years                 14 years 3 months 15 years 4 months 28 days    
Customer Relationships | Minimum                        
Summary of Significant Accounting Policies [Line Items]                        
Intangible asset, useful life, in years                 10 years      
Customer Relationships | Maximum                        
Summary of Significant Accounting Policies [Line Items]                        
Intangible asset, useful life, in years                 40 years      
Trademarks and Trade Names                        
Summary of Significant Accounting Policies [Line Items]                        
Intangible asset, useful life, in years                 13 years 4 months 28 days 14 years 8 months 16 days    
Trademarks and Trade Names | Minimum                        
Summary of Significant Accounting Policies [Line Items]                        
Intangible asset, useful life, in years                 3 years      
Trademarks and Trade Names | Maximum                        
Summary of Significant Accounting Policies [Line Items]                        
Intangible asset, useful life, in years                 20 years      
Cutting Rights and Fiber Farms                        
Summary of Significant Accounting Policies [Line Items]                        
Depletion expense                 7.3us-gaap_Depletion
/ pkg_FiberSupplyAxis
= pkg_CuttingRightsandFiberFarmsMember		 2.5us-gaap_Depletion
/ pkg_FiberSupplyAxis
= pkg_CuttingRightsandFiberFarmsMember		 0.7us-gaap_Depletion
/ pkg_FiberSupplyAxis
= pkg_CuttingRightsandFiberFarmsMember		  
Other Long-Term Assets                        
Summary of Significant Accounting Policies [Line Items]                        
Unamortized deferred financing costs 14.1us-gaap_DeferredFinanceCostsNet
/ us-gaap_BalanceSheetLocationAxis
= pkg_OtherLongTermAssetsMember		       14.1us-gaap_DeferredFinanceCostsNet
/ us-gaap_BalanceSheetLocationAxis
= pkg_OtherLongTermAssetsMember		       14.1us-gaap_DeferredFinanceCostsNet
/ us-gaap_BalanceSheetLocationAxis
= pkg_OtherLongTermAssetsMember		 14.1us-gaap_DeferredFinanceCostsNet
/ us-gaap_BalanceSheetLocationAxis
= pkg_OtherLongTermAssetsMember		    
Net capitalized software costs 6.8us-gaap_CapitalizedComputerSoftwareNet
/ us-gaap_BalanceSheetLocationAxis
= pkg_OtherLongTermAssetsMember		       5.7us-gaap_CapitalizedComputerSoftwareNet
/ us-gaap_BalanceSheetLocationAxis
= pkg_OtherLongTermAssetsMember		       6.8us-gaap_CapitalizedComputerSoftwareNet
/ us-gaap_BalanceSheetLocationAxis
= pkg_OtherLongTermAssetsMember		 5.7us-gaap_CapitalizedComputerSoftwareNet
/ us-gaap_BalanceSheetLocationAxis
= pkg_OtherLongTermAssetsMember		    
Other Long-Term Assets | Cutting Rights and Fiber Farms                        
Summary of Significant Accounting Policies [Line Items]                        
Long-term lease costs capitalization (Cutting rights and Fiber farms) 38.0pkg_CapitalizedPaymentsUnderTimberCuttingRightsandFiberFarmsLeases
/ us-gaap_BalanceSheetLocationAxis
= pkg_OtherLongTermAssetsMember
/ pkg_FiberSupplyAxis
= pkg_CuttingRightsandFiberFarmsMember		       37.0pkg_CapitalizedPaymentsUnderTimberCuttingRightsandFiberFarmsLeases
/ us-gaap_BalanceSheetLocationAxis
= pkg_OtherLongTermAssetsMember
/ pkg_FiberSupplyAxis
= pkg_CuttingRightsandFiberFarmsMember		       38.0pkg_CapitalizedPaymentsUnderTimberCuttingRightsandFiberFarmsLeases
/ us-gaap_BalanceSheetLocationAxis
= pkg_OtherLongTermAssetsMember
/ pkg_FiberSupplyAxis
= pkg_CuttingRightsandFiberFarmsMember		 37.0pkg_CapitalizedPaymentsUnderTimberCuttingRightsandFiberFarmsLeases
/ us-gaap_BalanceSheetLocationAxis
= pkg_OtherLongTermAssetsMember
/ pkg_FiberSupplyAxis
= pkg_CuttingRightsandFiberFarmsMember		    
Pro Forma Had Inventory Change Not Been Made | Change in Accounting Method for Inventory Valuation                        
Summary of Significant Accounting Policies [Line Items]                        
Net income                 1.6us-gaap_NetIncomeLoss
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= pkg_ChangeInAccountingMethodForInventoryValuationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember		      
Inventories (69.2)us-gaap_InventoryNet
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= pkg_ChangeInAccountingMethodForInventoryValuationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember		               (69.2)us-gaap_InventoryNet
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= pkg_ChangeInAccountingMethodForInventoryValuationMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ProFormaMember		      
Effect of Change in Accounting Principle | Change in Accounting Method for Inventory Valuation                        
Summary of Significant Accounting Policies [Line Items]                        
Retained earnings                       $ 42.3us-gaap_RetainedEarningsAccumulatedDeficit
/ us-gaap_AdjustmentsForChangeInAccountingPrincipleAxis
= pkg_ChangeInAccountingMethodForInventoryValuationMember
/ pkg_EffectofChangeinAccountingPrincipleAxis
= pkg_EffectofChangeinAccountingPrincipleMember
[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).