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Contingencies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Loss Contingencies [Line Items] |  |  |  |
Loss contingency accrual | $ 14.2 us-gaap_LossContingencyAccrualAtCarryingValue | $ 15.3 us-gaap_LossContingencyAccrualAtCarryingValue |  |
Current portion of contingency reserves | (2.0)us-gaap_LossContingencyAccrualCarryingValueCurrent | (2.0)us-gaap_LossContingencyAccrualCarryingValueCurrent |  |
Long-term portion of contingency reserves | 12.2 us-gaap_LossContingencyAccrualCarryingValueNoncurrent | 13.3 us-gaap_LossContingencyAccrualCarryingValueNoncurrent |  |
Reserve for Environmental Costs [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss Contingency Accrual, Payments | 0 us-gaap_LossContingencyAccrualCarryingValuePayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ReserveForEnvironmentalCostsMember | 0 us-gaap_LossContingencyAccrualCarryingValuePayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ReserveForEnvironmentalCostsMember | 1.6 us-gaap_LossContingencyAccrualCarryingValuePayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ReserveForEnvironmentalCostsMember |
Loss contingency accrual | 13.6 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ReserveForEnvironmentalCostsMember | 14.9 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ReserveForEnvironmentalCostsMember | 14.1 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ReserveForEnvironmentalCostsMember | 15.0 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ReserveForEnvironmentalCostsMember
Hardboard Siding Reserves |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency accrual | $ 0.6 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = lpx_HardboardSidingReservesMember | $ 0.4 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = lpx_HardboardSidingReservesMember |  |

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- Definition Amount of loss contingency liability. + 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 Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer. + 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 Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer. + 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 Amount of payments made reducing loss contingency liability. + 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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