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Asset Retirement Obligations - Changes to Asset Retirement Obligation (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |  |
Asset retirement obligation at beginning of period | $ 32.0 us-gaap_AssetRetirementObligation | $ 5.1 us-gaap_AssetRetirementObligation
Acquisition | 4.1 pkg_AssetRetirementObligationIncreaseDuetoAcquisition | 23.8 pkg_AssetRetirementObligationIncreaseDuetoAcquisition
Liabilities incurred | 0 us-gaap_AssetRetirementObligationLiabilitiesIncurred | 3.2 us-gaap_AssetRetirementObligationLiabilitiesIncurred
Accretion expense | 1.0 us-gaap_AssetRetirementObligationAccretionExpense | 0.3 us-gaap_AssetRetirementObligationAccretionExpense
Payments | (0.1)us-gaap_AssetRetirementObligationCashPaidToSettle | 0 us-gaap_AssetRetirementObligationCashPaidToSettle
Revisions in estimated cash flows | 0 us-gaap_AssetRetirementObligationRevisionOfEstimate | (0.4)us-gaap_AssetRetirementObligationRevisionOfEstimate
Asset retirement obligation at end of period | $ 37.0 us-gaap_AssetRetirementObligation | $ 32.0 us-gaap_AssetRetirementObligation

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- Definition Amount of asset retirement obligation increase due to acquisition during the period. + References No definition available. + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of cash paid during the period to settle an asset retirement obligation. Amounts paid to settle an asset retirement obligation are generally included in the operating section of the Statement of Cash Flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3367-108585 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Details
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