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Segment Information Identifiable assets (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets	$ 2,331.0	$ 2,139.9
OSB [Member]
Assets	500.0	525.6
Siding [Member]
Assets	200.0	167.1
Engineered Wood Products [Member]
Assets	100.0	141.4
South America [Member]
Assets	200.0	156.6
All Other Segments [Member]
Assets	25.2	33.6
Unallocated Amount to Segment [Member]
Assets	$ 1,291.1	$ 1,115.6

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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