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Segment Information Additional Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 31, 2012 OSB Mills Construction Related Legal Reserves [Member] | Sep. 30, 2011 OSB Mills Construction Related Legal Reserves [Member] | Dec. 31, 2011 OSB Mills Construction Related Legal Reserves [Member] | Dec. 31, 2012 Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2011 Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2010 Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2012 Supplemental Employee Retirement Plans, Defined Benefit [Member] | Dec. 31, 2012 Siding [Member]
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Severance Costs |  |  |  | $ 0.5 | $ 1.1 | $ 0 | $ 0.3 | $ (0.4) | $ (1.1) |  |  |  |  |
Loss Contingency Accrual, Carrying Value, Provision |  |  |  |  |  |  | 0.5 |  |  |  |  |  |  |
Product Warranty Accrual, Period Increase (Decrease) |  |  |  | (1.8) | (0.4) | 0 |  |  |  |  |  |  |  | 1.0
Impairment of Long-Lived Assets to be Disposed of |  |  |  |  |  |  |  |  |  | 4.4 | 6.9 |  |  |
Gain on settlement of litigation related to ARS |  |  | 0.8 | 20.0 | 0 | 0 |  |  |  |  |  |  |  |
Adjustments related to prior year inventory |  |  |  | 1.5 | 0 | 0 |  |  |  |  |  |  |  |
Adjustments to retirement accounts |  |  |  | 3.8 | 0 | 0 |  |  |  |  |  |  |  |
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments |  |  |  | 2.2 | 0 | 0.2 |  |  |  |  |  |  | 2.2 |
Other Postretirement Benefit Expense |  |  |  | 1.6 |  |  |  |  |  |  |  |  |  |
Reductions, net of additions, to product related contingency reserves | (10.7) |  |  | (5.0) | (11.5) | (2.5) |  |  |  |  |  |  |  |
Reserves For Timber Obligations |  | 1.5 |  | 0.8 | 1.5 | 0 |  |  |  |  |  |  |  |
Accrual for Environmental Loss Contingencies, Provision for New Losses |  | 0.9 |  | 0 | (0.9) | 0 |  |  |  |  |  |  |  |
Other-than-temporary impairment of investments |  |  |  | $ 0 | $ 14.8 | $ 17.0 |  |  |  |  |  | $ 17.0 |  |

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- Definition The amount added to the accrual for newly incurred environmental loss contingencies. These additions include remediation expense and interest accretion. These additions do not relate to changes in the environmental accrual related to a business acquisition or divestiture, to currency movements, or revisions in previously existing estimates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=6572457&loc=d3e149879-122751 + Details
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- Definition The net proceeds or assets obtained in excess of (less than) the net carrying amount of assets recorded, or assets distributed and liabilities assumed less than (in excess of) estimated litigation liability extinguished, in settlement of a litigation matter. Represents (for other than an insurance entity in its normal claims settlement process), the amount of income (expense) recognized in the period to settle pending or threatened litigation and insurance claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6952336&loc=d3e14326-108349 + Details
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- Definition The increase (decrease) in the period in loss contingency liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6952336&loc=d3e14326-108349 + Details
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