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

X

- 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

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- Details

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