The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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+ Details

Other Operating Credits and Charges, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended		3 Months Ended			9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 OSB Mills Construction Related Legal Reserves [Member]	Mar. 31, 2012 OSB Mills Construction Related Legal Reserves [Member]	Sep. 30, 2011 OSB Mills Construction Related Legal Reserves [Member]	Sep. 30, 2012 OSB Mills Construction Related Legal Reserves [Member]	Sep. 30, 2011 OSB Mills Construction Related Legal Reserves [Member]
Gain Contingencies [Line Items]
Severance	$ (0.2)				$ (0.7)	$ (0.4)	$ (0.2)		$ (0.4)	$ (0.7)
Construction related legal reserves							0	0.5	(0.5)	0.5	(0.5)
Addition to environmental reserves	0	0	(0.9)		0	(0.9)
Addition to warranty reserves	1.0	0			1.0	0
Reduction to product related contingenciy reserves	0	10.7			0	10.7
Timber related reserves	0	0	1.5		0	1.5
Settlement of legal claim	0	0		0.8	0	0.8
Other Operating Income (Expense), Net	$ (1.2)	$ 9.8			$ (1.2)	$ 11.2