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Investments Contractual maturies (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Available-for-sale Securities, Amortized Cost Basis | $ 0.3 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 0.4 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available-for-sale Securities, Fair Value Disclosure | 4.6 us-gaap_AvailableForSaleSecurities |
Within one year from the balance sheet date [Member] |  |
Available-for-sale Securities, Amortized Cost Basis | 0 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByCategoryOfDebtSecurityAxis = lpx_WithinoneyearfromthebalancesheetdateMember |
Available-for-sale Securities, Fair Value Disclosure | 0 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = lpx_WithinoneyearfromthebalancesheetdateMember |
more than one year from balance sheet date [Member] |  |
Available-for-sale Securities, Amortized Cost Basis | 0.3 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InformationByCategoryOfDebtSecurityAxis = lpx_MoreThanOneYearFromBalanceSheetDateMember |
Available-for-sale Securities, Fair Value Disclosure | $ 4.6 us-gaap_AvailableForSaleSecurities / us-gaap_InformationByCategoryOfDebtSecurityAxis = lpx_MoreThanOneYearFromBalanceSheetDateMember |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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