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Segment Information Identifiable assets (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Assets | $ 2,353.5 us-gaap_Assets | $ 2,493.3 us-gaap_Assets
OSB |  |
Assets | 675.8 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lpx_OsbMember | 668.9 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lpx_OsbMember
Siding |  |
Assets | 205.5 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lpx_SidingMember | 189.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lpx_SidingMember
Engineered Wood Products |  |
Assets | 130.5 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lpx_EngineeredWoodProductsMember | 129.3 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = lpx_EngineeredWoodProductsMember
South America |  |
Assets | 126.9 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_SouthAmericaMember | 137.5 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_SouthAmericaMember
Other |  |
Assets | 41.5 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 39.4 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Unallocated Amount to Segment |  |
Assets | $ 1,173.3 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember | $ 1,328.8 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_MaterialReconcilingItemsMember

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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