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Other Expense, Net - Components Expense, Net (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other Income and Expenses [Abstract] |  |  |  |  |
Integration-related and other costs | $ 20.0 us-gaap_BusinessCombinationIntegrationRelatedCosts | [1] | $ 17.4 us-gaap_BusinessCombinationIntegrationRelatedCosts | [1] | $ 0 us-gaap_BusinessCombinationIntegrationRelatedCosts
Class action lawsuit settlement | 17.6 us-gaap_GainLossRelatedToLitigationSettlement | [2] | 0 us-gaap_GainLossRelatedToLitigationSettlement |  | 0 us-gaap_GainLossRelatedToLitigationSettlement
DeRidder restructuring | 7.3 us-gaap_RestructuringSettlementAndImpairmentProvisions | [3] | 0 us-gaap_RestructuringSettlementAndImpairmentProvisions |  | 0 us-gaap_RestructuringSettlementAndImpairmentProvisions
Pension curtailment charges | 0 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments |  | 10.9 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments | [4] | 0 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
Acquisition-related costs | 0 us-gaap_BusinessCombinationAcquisitionRelatedCosts |  | 17.2 us-gaap_BusinessCombinationAcquisitionRelatedCosts | [5] | 0 us-gaap_BusinessCombinationAcquisitionRelatedCosts
Asset disposals and write-offs | 10.1 us-gaap_GainLossOnDispositionOfAssets |  | 13.2 us-gaap_GainLossOnDispositionOfAssets |  | 10.8 us-gaap_GainLossOnDispositionOfAssets
Other | 2.3 us-gaap_OtherCostAndExpenseOperating |  | 0.3 us-gaap_OtherCostAndExpenseOperating |  | 1.0 us-gaap_OtherCostAndExpenseOperating
Total | $ 57.3 us-gaap_OtherOperatingIncomeExpenseNet |  | $ 59.0 us-gaap_OtherOperatingIncomeExpenseNet |  | $ 11.8 us-gaap_OtherOperatingIncomeExpenseNet
[1] | Includes Boise acquisition integration-related and other costs, which primarily relate to severance, retention, travel, and professional fees.
[2] | Includes $17.6 million of costs for the settlement of the Kleen Products LLC v Packaging Corp. of America et al class action lawsuit. See Note 20, Commitments, Guarantees, Indemnifications, and Legal Proceedings, for more information.
[3] | Costs relate primarily to the conversion of the No. 3 newsprint machine at our DeRidder, Louisiana, mill to produce lightweight linerboard and corrugating medium, and our exit from the newsprint business in September 2014.
[4] | Includes $10.9 million of non-cash pension curtailment charges related to pension plan changes in which certain hourly corrugated plant and containerboard mill employees will transition from a defined benefit pension plan to a defined contribution (401k) plan.
[5] | Includes $17.2 million of acquisition-related costs, primarily for professional fees related to transaction-advisory services and expenses related to financing the acquisition of Boise.

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs. + References No definition available. + Details
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- Definition The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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