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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Apr. 28, 2014
Goodwill [Line Items] |  |  |  |
Goodwill | $ 546.8 us-gaap_Goodwill |  | $ 526.8 us-gaap_Goodwill |
Goodwill [Roll Forward] |  |  |  |
Beginning Balance | 526.8 us-gaap_Goodwill |  | 67.2 us-gaap_Goodwill |
Acquisitions | 12.2 us-gaap_GoodwillAcquiredDuringPeriod | [1] | 459.6 us-gaap_GoodwillAcquiredDuringPeriod |
Adjustments related to purchase accounting | 7.8 us-gaap_GoodwillPurchaseAccountingAdjustments | [2] |  |
Ending Balance | 546.8 us-gaap_Goodwill |  | 526.8 us-gaap_Goodwill |
Packaging |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 491.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  | 472.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |
Goodwill [Roll Forward] |  |  |  |
Beginning Balance | 472.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  | 67.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |
Acquisitions | 12.2 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember | [1] | 405.7 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |
Adjustments related to purchase accounting | 6.5 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember | [2] |  |
Ending Balance | 491.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  | 472.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |
Paper |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 55.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |  | 53.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |
Goodwill [Roll Forward] |  |  |  |
Beginning Balance | 53.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |  | 0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |
Acquisitions | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |  | 53.9 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |
Adjustments related to purchase accounting | 1.3 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember | [2] |  |
Ending Balance | 55.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |  | 53.9 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = pkg_PaperMember |
Crockett Packaging | Packaging |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 12.2 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = pkg_CrockettPackagingMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  |  |
Goodwill [Roll Forward] |  |  |  |
Ending Balance | 12.2 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = pkg_CrockettPackagingMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember |  |  |
Business acquisition, cost of acquired entity |  |  |  | 21.2 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = pkg_CrockettPackagingMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember
Working capital adjustments |  |  |  | $ 0.7 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = pkg_CrockettPackagingMember / us-gaap_StatementBusinessSegmentsAxis = pkg_PackagingMember
[1] | In April 2014, we acquired the assets of Crockett Packaging, a corrugated products manufacturer, for $21.2 million, before $0.7 million of working capital adjustments, and recorded $12.2 million of goodwill in our Packaging segment.
[2] | Adjustments relate primarily to the Boise acquisition, see Note 3, Acquisitions, for more information.

X
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 + Details
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