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Summary of Significant Accounting Policies - Additional Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.3 us-gaap_ResearchAndDevelopmentExpense | $ 11.5 us-gaap_ResearchAndDevelopmentExpense | $ 11.3 us-gaap_ResearchAndDevelopmentExpense |
Cash and cash equivalents | 124.9 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  |  |  |  |  | 191.0 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  |  |  |  | 124.9 us-gaap_CashAndCashEquivalentsAtCarryingValue | 191.0 us-gaap_CashAndCashEquivalentsAtCarryingValue | 207.4 us-gaap_CashAndCashEquivalentsAtCarryingValue | 156.3 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash equivalents | 79.9 us-gaap_CashEquivalentsAtCarryingValue |  |  |  |  |  |  |  | 156.6 us-gaap_CashEquivalentsAtCarryingValue |  |  |  |  |  |  | 79.9 us-gaap_CashEquivalentsAtCarryingValue | 156.6 us-gaap_CashEquivalentsAtCarryingValue |  |
Allowance for doubtful accounts | 4.9 us-gaap_AllowanceForDoubtfulAccountsReceivable |  |  |  |  |  |  |  | 3.9 us-gaap_AllowanceForDoubtfulAccountsReceivable |  |  |  |  |  |  | 4.9 us-gaap_AllowanceForDoubtfulAccountsReceivable | 3.9 us-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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.4 pkg_ReserveForCustomerDeductions | 6.7 pkg_ReserveForCustomerDeductions |  |
Net income | 98.5 us-gaap_NetIncomeLoss | [1] | 104.4 us-gaap_NetIncomeLoss | [2] | 99.6 us-gaap_NetIncomeLoss | [3] | 90.1 us-gaap_NetIncomeLoss | [4] | 228.1 us-gaap_NetIncomeLoss | [5] | 84.7 us-gaap_NetIncomeLoss | [6] | 66.2 us-gaap_NetIncomeLoss | [7] | 62.3 us-gaap_NetIncomeLoss | 392.6 us-gaap_NetIncomeLoss | 441.3 us-gaap_NetIncomeLoss | 160.2 us-gaap_NetIncomeLoss |
Inventories | 664.9 us-gaap_InventoryNet |  |  |  |  |  |  |  | 594.3 us-gaap_InventoryNet |  |  |  |  |  |  | 664.9 us-gaap_InventoryNet | 594.3 us-gaap_InventoryNet |  |
Retained earnings | 1,242.2 us-gaap_RetainedEarningsAccumulatedDeficit |  |  |  |  |  |  |  | 1,019.1 us-gaap_RetainedEarningsAccumulatedDeficit |  |  |  |  |  |  | 1,242.2 us-gaap_RetainedEarningsAccumulatedDeficit | 1,019.1 us-gaap_RetainedEarningsAccumulatedDeficit |  |
Interest capitalization, construction in progress |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.8 us-gaap_InterestCostsCapitalized | 1.7 us-gaap_InterestCostsCapitalized | 0.8 us-gaap_InterestCostsCapitalized |
Intangible asset, useful life, in years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 years 2 months 8 days | 15 years 4 months 10 days |  |
Goodwill | 546.8 us-gaap_Goodwill |  |  |  |  |  |  |  | 526.8 us-gaap_Goodwill |  |  |  |  |  |  | 546.8 us-gaap_Goodwill | 526.8 us-gaap_Goodwill | 67.2 us-gaap_Goodwill |
Area leased under timberland cutting rights (acres) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 88,000 pkg_AreaLeasedUnderTimberlandCuttingRights |  |  |
Area leased where fiber farms are operated (acres) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000 pkg_AreaLeasedWhereFiberFarmsAreOperated |  |  |
Software amortization expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.9 us-gaap_CapitalizedComputerSoftwareAmortization | 1.1 us-gaap_CapitalizedComputerSoftwareAmortization | 0.9 us-gaap_CapitalizedComputerSoftwareAmortization |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of senior credit facilities and notes, in years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 pkg_TermOfSeniorCreditFacilitiesAndNotes / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of senior credit facilities and notes, in years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 pkg_TermOfSeniorCreditFacilitiesAndNotes / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Foreign operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 10.4 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementGeographicalAxis = pkg_ForeignOperationsMember |  |  |  |  |  |  |  | 7.1 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementGeographicalAxis = pkg_ForeignOperationsMember |  |  |  |  |  |  | 10.4 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementGeographicalAxis = pkg_ForeignOperationsMember | 7.1 us-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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.3 us-gaap_Depletion / pkg_FiberSupplyAxis = pkg_CuttingRightsandFiberFarmsMember | 2.5 us-gaap_Depletion / pkg_FiberSupplyAxis = pkg_CuttingRightsandFiberFarmsMember | 0.7 us-gaap_Depletion / pkg_FiberSupplyAxis = pkg_CuttingRightsandFiberFarmsMember |
Other Long-Term Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized deferred financing costs | 14.1 us-gaap_DeferredFinanceCostsNet / us-gaap_BalanceSheetLocationAxis = pkg_OtherLongTermAssetsMember |  |  |  |  |  |  |  | 14.1 us-gaap_DeferredFinanceCostsNet / us-gaap_BalanceSheetLocationAxis = pkg_OtherLongTermAssetsMember |  |  |  |  |  |  | 14.1 us-gaap_DeferredFinanceCostsNet / us-gaap_BalanceSheetLocationAxis = pkg_OtherLongTermAssetsMember | 14.1 us-gaap_DeferredFinanceCostsNet / us-gaap_BalanceSheetLocationAxis = pkg_OtherLongTermAssetsMember |  |
Net capitalized software costs | 6.8 us-gaap_CapitalizedComputerSoftwareNet / us-gaap_BalanceSheetLocationAxis = pkg_OtherLongTermAssetsMember |  |  |  |  |  |  |  | 5.7 us-gaap_CapitalizedComputerSoftwareNet / us-gaap_BalanceSheetLocationAxis = pkg_OtherLongTermAssetsMember |  |  |  |  |  |  | 6.8 us-gaap_CapitalizedComputerSoftwareNet / us-gaap_BalanceSheetLocationAxis = pkg_OtherLongTermAssetsMember | 5.7 us-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) | 38.0 pkg_CapitalizedPaymentsUnderTimberCuttingRightsandFiberFarmsLeases / us-gaap_BalanceSheetLocationAxis = pkg_OtherLongTermAssetsMember / pkg_FiberSupplyAxis = pkg_CuttingRightsandFiberFarmsMember |  |  |  |  |  |  |  | 37.0 pkg_CapitalizedPaymentsUnderTimberCuttingRightsandFiberFarmsLeases / us-gaap_BalanceSheetLocationAxis = pkg_OtherLongTermAssetsMember / pkg_FiberSupplyAxis = pkg_CuttingRightsandFiberFarmsMember |  |  |  |  |  |  | 38.0 pkg_CapitalizedPaymentsUnderTimberCuttingRightsandFiberFarmsLeases / us-gaap_BalanceSheetLocationAxis = pkg_OtherLongTermAssetsMember / pkg_FiberSupplyAxis = pkg_CuttingRightsandFiberFarmsMember | 37.0 pkg_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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.6 us-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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 42.3 us-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).

X
- Definition Represents number of acres of timberland under cutting right leases. + References No definition available. + Details
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- Definition Represents amount of lease payments under long-term timberland cutting rights leases and fiber farms that are capitalized. + References No definition available. + Details
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