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Acquisition of Peace Valley OSB (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent |  |  |  | 50.00%us-gaap_MinorityInterestOwnershipPercentageByParent |  |  |
Equity Interest in Joint Venture, Fair Value at Acquisition Date |  |  |  |  | $ 95.9 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1 |  |  |
Gain on acquisition of joint venture |  |  |  |  | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain | 35.9 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain | 0 us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain |
Acquisition Purchase Price | 74.6 lpx_BusinessAcquisitionPurchasePrice |  |  |  | 74.6 lpx_BusinessAcquisitionPurchasePrice |  |  |
Contingent Consideration, Liability | 0 us-gaap_BusinessCombinationContingentConsiderationLiability |  | 2.1 us-gaap_BusinessCombinationContingentConsiderationLiability |  | 0 us-gaap_BusinessCombinationContingentConsiderationLiability | 2.1 us-gaap_BusinessCombinationContingentConsiderationLiability |  | 24.3 us-gaap_BusinessCombinationContingentConsiderationLiability
Adjustment to contingent consideration fair value | 3.3 lpx_Adjustmenttocontingentconsiderationfairvalue | (0.1)lpx_Adjustmenttocontingentconsiderationfairvalue | 3.2 lpx_Adjustmenttocontingentconsiderationfairvalue | 17.3 lpx_Adjustmenttocontingentconsiderationfairvalue | 3.2 lpx_Adjustmenttocontingentconsiderationfairvalue | 20.5 lpx_Adjustmenttocontingentconsiderationfairvalue | 0 lpx_Adjustmenttocontingentconsiderationfairvalue |
Net Assets Acquired | 194.8 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |  |  |  | 194.8 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |  |  |
Business Combination, Assets Acquired, Current Assets | 22.7 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets |  |  |  | 22.7 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets |  |  |
Business Combination, Assets Acquired, Property, Plant, and Equipment | 146.4 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment |  |  |  | 146.4 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment |  |  |
Business Combination, Assets Acquired, Intangibles | 43.8 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles |  |  |  | 43.8 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles |  |  |
Business Combination, Assets Acquired, Timber Licenses | 34.1 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill |  |  |  | 34.1 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill |  |  |
Goodwill | 9.7 us-gaap_Goodwill |  | 9.7 us-gaap_Goodwill |  | 9.7 us-gaap_Goodwill | 9.7 us-gaap_Goodwill | 0 us-gaap_Goodwill |
Business Combination, Liabilities Assumed, Current Liabilities | 8.7 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities |  |  |  | 8.7 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities |  |  |
Business Combination, Liabilities Assumed, Long-Term Liabilities | 9.4 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther |  |  |  | 9.4 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther |  |  |
Long-Term Liability [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Contingent Consideration, Liability | $ 0 us-gaap_BusinessCombinationContingentConsiderationLiability / lpx_ContingentConsiderationAxis = lpx_LongTermLiabilityMember |  |  |  | $ 0 us-gaap_BusinessCombinationContingentConsiderationLiability / lpx_ContingentConsiderationAxis = lpx_LongTermLiabilityMember |  |  | $ 24.3 us-gaap_BusinessCombinationContingentConsiderationLiability / lpx_ContingentConsiderationAxis = lpx_LongTermLiabilityMember

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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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