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Contingency Reserves (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Loss Contingencies [Line Items] |  |
Loss contingency accrual | $ 14.4 | $ 14.8
Current portion of contingency reserves | (2.0) | (2.0)
Long-term portion of contingency reserves | 12.4 | 12.8
Environmental reserves [Member] |  |
Loss Contingencies [Line Items] |  |
Loss contingency accrual | 13.9 | 14.1
Hardboard Siding Reserves [Member] |  |
Loss Contingencies [Line Items] |  |
Loss contingency accrual | $ 0.5 | $ 0.7

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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 loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer. + 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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