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Contingencies Enviromental liabilities rollforward (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Beginning Balance | $ 15.3 us-gaap_LossContingencyAccrualAtCarryingValue |  |
Adjusted to expense (income) during the year | 0 us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease | 0 us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease | 5.0 us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease
Ending Balance | 14.2 us-gaap_LossContingencyAccrualAtCarryingValue | 15.3 us-gaap_LossContingencyAccrualAtCarryingValue |
Reserve for Environmental Costs [Member] |  |  |
Beginning Balance | 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
Adjusted to expense (income) during the year | 1.3 us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ReserveForEnvironmentalCostsMember | 1.3 us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ReserveForEnvironmentalCostsMember | 0.7 us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ReserveForEnvironmentalCostsMember
Payments made | 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
Ending Balance | 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
Formal cost share [Member] |  |  |
Other Unrecorded Amounts | 2.3 us-gaap_OtherUnrecordedAmounts / us-gaap_EnvironmentalRemediationSiteAxis = lpx_FormalCostShareMember |  |
Indemnification Agreement [Member] |  |  |
Other Unrecorded Amounts | 2.7 us-gaap_OtherUnrecordedAmounts / us-gaap_EnvironmentalRemediationSiteAxis = us-gaap_IndemnificationGuaranteeMember |  |
Other Reserves [Member] |  |  |
Other Unrecorded Amounts | $ 0.2 us-gaap_OtherUnrecordedAmounts / us-gaap_EnvironmentalRemediationSiteAxis = lpx_OtherReservesMember |  |

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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 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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- Definition Amount of increase (decrease) in 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 Other unrecorded indebtedness which have not been separately stated. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3 -Number 240 -Section 3 -Subparagraph i -Article 15c3 + Details
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