Contingency Reserves Hardboard Contingencies Rollforward (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Loss Contingencies [Line Items]
Loss Contingency Accrual, Carrying Value, Period Increase (Decrease)	$ 10.7	$ 0	$ (10.7)	$ 0
Loss Contingency Accrual [Roll Forward]
Beginning Balance			32.9
Ending Balance	21.8		21.8
Hardboard Siding Reserves [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Carrying Value, Period Increase (Decrease)			(10.7)	0
Loss Contingency Accrual [Roll Forward]
Beginning Balance			17.8	24.2
Payments made for claims			(0.4)	(2.4)
Payments made for administrative costs			(0.3)	(1.2)
Ending Balance	$ 6.4	$ 20.6	$ 6.4	$ 20.6

Payments Made for Litigation Administrative Expense for Hardboard Siding Reserves

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The carrying amount as of the balance sheet date of the combined total of 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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The payments made in the period which reduced loss contingency liabilities.

+ References

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The increase (decrease) in the period in loss contingency liabilities.

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