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Other Operating Credits and Charges, Net (Details) (USD $) In Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Gain Contingencies [Line Items]
Reversal of severance	$ 0		$ 0	$ 0	$ 0.1
Addition to environmental reserves	(0.9)		0	(0.9)	0
Timber related reserves	1.5		0	1.5	0
Settlement of legal claim	0	0.8	0	0.8	0
Other operating income (expense), net	0.6		(0.6)	1.4	(0.5)
OSB Mills Construction Related Legal Reserves [Member]
Gain Contingencies [Line Items]
Construction related legal reserves	$ 0		$ 0.6	$ 0	$ (0.6)

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- Definition

Gain for Reductions in Reserves Associated With Canadian Timber Obligations

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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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The charge against earnings in the period to increase loss contingency liabilities, net of any adjustments to reduce previously estimated charges.

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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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