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Income Taxes - Deferred Income Tax Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Accrued liabilities $ 19.0us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities $ 19.5us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Employee benefits and compensation 44.2us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 27.3us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Net operating loss carryforwards 85.2us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 126.8us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Stock options and restricted stock 8.9us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 8.9us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Pension and postretirement benefits 139.1us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 75.5us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Derivatives 16.0us-gaap_DeferredTaxAssetsDerivativeInstruments 18.2us-gaap_DeferredTaxAssetsDerivativeInstruments
Capital loss, general business, foreign, and AMT credit carryforwards 1.8us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness 2.6us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness
Gross deferred tax assets 314.2us-gaap_DeferredTaxAssetsGross 278.8us-gaap_DeferredTaxAssetsGross
Valuation allowance (1.7)us-gaap_DeferredTaxAssetsValuationAllowance [1] (2.7)us-gaap_DeferredTaxAssetsValuationAllowance [1]
Net deferred tax assets 312.5us-gaap_DeferredTaxAssetsNet 276.1us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Property, plant, and equipment (531.6)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (519.7)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Goodwill and intangible assets (107.7)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets (111.9)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Inventories (7.4)pkg_DeferredTaxLiabilitiesInventories (28.5)pkg_DeferredTaxLiabilitiesInventories
Investment in joint venture 0us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates (1.0)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Other 0us-gaap_DeferredTaxLiabilitiesOther (2.2)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (646.7)us-gaap_DeferredTaxLiabilities (663.3)us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities (334.2)us-gaap_DeferredTaxAssetsLiabilitiesNet [2] (387.2)us-gaap_DeferredTaxAssetsLiabilitiesNet
Net Operating Loss Carryforwards    
Deferred tax assets:    
Valuation allowance (1.1)us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= pkg_NetOperatingLossCarryforwardsMember		 (1.6)us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= pkg_NetOperatingLossCarryforwardsMember
Capital Loss Carryforward    
Deferred tax assets:    
Valuation allowance $ (0.6)us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_CapitalLossCarryforwardMember		 $ (1.1)us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_ValuationAllowanceByDeferredTaxAssetAxis
= us-gaap_CapitalLossCarryforwardMember
[1] Deferred tax assets are reduced by a valuation allowance when it is more likely than not that some portion of the deferred tax assets will not be realized. In 2014, of the $1.7 million valuation allowance, $1.1 million relates to foreign net operating loss carryforwards and credits and $0.6 million relates to capital losses. In 2013, of the $2.7 million valuation allowance, $1.6 million relates to foreign net operating loss carryforwards and credits and $1.1 million relates to capital losses. We do not expect to generate capital gains before the capital losses expire. If or when recognized, the tax benefits relating to the reversal of any of or all of the valuation allowance would be recognized as a benefit to income tax expense.
[2] As of December 31, 2014, we did not recognize U.S. deferred income taxes on our cumulative total of undistributed foreign earnings for our non-U.S. subsidiaries. We indefinitely reinvest our earnings in operations outside the United States. It is not practicable to determine the amount of unrecognized deferred tax liability on these undistributed earnings because the actual tax liability, if any, is dependent on circumstances existing when the repatriation occurs.