Assets Held for Sale (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Property, plant and equipment held for sale [Abstract]
Assets held-for-sale, property, plant and equipment	$ 217.3	$ 235.6
Assets held for sale acumulated depreciation	(164.6)	(177.7)
Assets Held For Sale Property Plant and Equipment Net	52.7	57.9
OSB [Member]
Property, Plant and Equipment [Line Items]
Number of OSB mills included in held for sale assets	3,000,000	3,000,000
Land Land Improvements And Logging Roads Net of Road Amortization [Member]
Property, plant and equipment held for sale [Abstract]
Assets held-for-sale, property, plant and equipment	13.8	13.4
Building [Member]
Property, plant and equipment held for sale [Abstract]
Assets held-for-sale, property, plant and equipment	24.0	24.5
Machinery and Equipment [Member]
Property, plant and equipment held for sale [Abstract]
Assets held-for-sale, property, plant and equipment	$ 179.5	$ 197.7