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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					$ 95.9us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1
Gain on acquisition of joint venture					0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain	35.9us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain	0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
Acquisition Purchase Price	74.6lpx_BusinessAcquisitionPurchasePrice				74.6lpx_BusinessAcquisitionPurchasePrice
Contingent Consideration, Liability	0us-gaap_BusinessCombinationContingentConsiderationLiability		2.1us-gaap_BusinessCombinationContingentConsiderationLiability		0us-gaap_BusinessCombinationContingentConsiderationLiability	2.1us-gaap_BusinessCombinationContingentConsiderationLiability		24.3us-gaap_BusinessCombinationContingentConsiderationLiability
Adjustment to contingent consideration fair value	3.3lpx_Adjustmenttocontingentconsiderationfairvalue	(0.1)lpx_Adjustmenttocontingentconsiderationfairvalue	3.2lpx_Adjustmenttocontingentconsiderationfairvalue	17.3lpx_Adjustmenttocontingentconsiderationfairvalue	3.2lpx_Adjustmenttocontingentconsiderationfairvalue	20.5lpx_Adjustmenttocontingentconsiderationfairvalue	0lpx_Adjustmenttocontingentconsiderationfairvalue
Net Assets Acquired	194.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet				194.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
Business Combination, Assets Acquired, Current Assets	22.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets				22.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
Business Combination, Assets Acquired, Property, Plant, and Equipment	146.4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment				146.4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
Business Combination, Assets Acquired, Intangibles	43.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles				43.8us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
Business Combination, Assets Acquired, Timber Licenses	34.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill				34.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Goodwill	9.7us-gaap_Goodwill		9.7us-gaap_Goodwill		9.7us-gaap_Goodwill	9.7us-gaap_Goodwill	0us-gaap_Goodwill
Business Combination, Liabilities Assumed, Current Liabilities	8.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities				8.7us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
Business Combination, Liabilities Assumed, Long-Term Liabilities	9.4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther				9.4us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
Long-Term Liability [Member]
Business Acquisition [Line Items]
Contingent Consideration, Liability	$ 0us-gaap_BusinessCombinationContingentConsiderationLiability / lpx_ContingentConsiderationAxis = lpx_LongTermLiabilityMember				$ 0us-gaap_BusinessCombinationContingentConsiderationLiability / lpx_ContingentConsiderationAxis = lpx_LongTermLiabilityMember			$ 24.3us-gaap_BusinessCombinationContingentConsiderationLiability / lpx_ContingentConsiderationAxis = lpx_LongTermLiabilityMember

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