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Income Taxes - Summary of Operating Loss Carryforwards (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
U.S. federal and non-U.S. NOLs	$ 78.0pkg_OperatingLossCarryforwardsUsFederalAndNonUs
State taxing jurisdiction NOLs	7.2pkg_OperatingLossCarryforwardsStateTaxingJurisdiction
U.S. federal, non-U.S., and state tax credit carryforwards	1.2pkg_TaxCreditCarryforwardUsFederalNonUsAndState
U.S. federal capital loss carryforwards	0.6pkg_UsFederalCapitalLossCarryforwards
Total	87.0us-gaap_OperatingLossCarryforwards
2015 Through 2024
Operating Loss Carryforwards [Line Items]
U.S. federal and non-U.S. NOLs	1.1pkg_OperatingLossCarryforwardsUsFederalAndNonUs / us-gaap_TaxCreditCarryforwardAxis = pkg_A2015Through2024Member
State taxing jurisdiction NOLs	3.6pkg_OperatingLossCarryforwardsStateTaxingJurisdiction / us-gaap_TaxCreditCarryforwardAxis = pkg_A2015Through2024Member
U.S. federal, non-U.S., and state tax credit carryforwards	0.2pkg_TaxCreditCarryforwardUsFederalNonUsAndState / us-gaap_TaxCreditCarryforwardAxis = pkg_A2015Through2024Member
U.S. federal capital loss carryforwards	0.6pkg_UsFederalCapitalLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = pkg_A2015Through2024Member
Total	5.5us-gaap_OperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = pkg_A2015Through2024Member
2025 Through 2034
Operating Loss Carryforwards [Line Items]
U.S. federal and non-U.S. NOLs	76.6pkg_OperatingLossCarryforwardsUsFederalAndNonUs / us-gaap_TaxCreditCarryforwardAxis = pkg_A2025Through2034Member
State taxing jurisdiction NOLs	3.6pkg_OperatingLossCarryforwardsStateTaxingJurisdiction / us-gaap_TaxCreditCarryforwardAxis = pkg_A2025Through2034Member
U.S. federal, non-U.S., and state tax credit carryforwards	0.4pkg_TaxCreditCarryforwardUsFederalNonUsAndState / us-gaap_TaxCreditCarryforwardAxis = pkg_A2025Through2034Member
U.S. federal capital loss carryforwards	0pkg_UsFederalCapitalLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = pkg_A2025Through2034Member
Total	80.6us-gaap_OperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = pkg_A2025Through2034Member
Indefinite
Operating Loss Carryforwards [Line Items]
U.S. federal and non-U.S. NOLs	0.3pkg_OperatingLossCarryforwardsUsFederalAndNonUs / us-gaap_TaxCreditCarryforwardAxis = pkg_IndefiniteMember
State taxing jurisdiction NOLs	0pkg_OperatingLossCarryforwardsStateTaxingJurisdiction / us-gaap_TaxCreditCarryforwardAxis = pkg_IndefiniteMember
U.S. federal, non-U.S., and state tax credit carryforwards	0.6pkg_TaxCreditCarryforwardUsFederalNonUsAndState / us-gaap_TaxCreditCarryforwardAxis = pkg_IndefiniteMember
U.S. federal capital loss carryforwards	0pkg_UsFederalCapitalLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = pkg_IndefiniteMember
Total	$ 0.9us-gaap_OperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = pkg_IndefiniteMember

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- Definition

Operating Loss Carryforwards State Taxing Jurisdiction

+ References

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- Definition

Operating Loss Carryforwards U.S. Federal and Non U.S.

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- Definition

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- Definition

US Federal Capital Loss Carryforwards

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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

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