Selected Segment Data (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Segment Reporting Information [Line Items]
Net sales:	$ 350.6	$ 322.8	$ 1,044.7	$ 1,067.3
Operating profit (loss):	(72.7)	(15.9)	(114.5)	10.3
Other operating credits and charges, net	9.8	(2.3)	11.2	(2.8)
Gain (loss) on sale or impairment of long-lived assets	(65.0)	(0.9)	(73.0)	(2.1)
General corporate and other expenses, net	(15.2)	(17.0)	(49.6)	(55.0)
Foreign currency gains (losses)	(4.0)	(0.4)	(1.6)	1.0
Other than Temporary Impairment Losses, Investments	0	16.9	0	16.9
Equity Investment, Other than Temporary Impairment	0	(16.9)	0	(16.9)
Investment income	16.7	4.9	24.2	15.1
Interest expense, net of capitalized interest	(14.2)	(15.3)	(42.6)	(49.8)
Loss from continuing operations before taxes	(80.2)	(47.3)	(151.2)	(43.8)
Provision (benefit) for income taxes	(20.9)	(16.4)	(36.1)	(14.0)
Income (loss) from continuing operations	(59.3)	(30.9)	(115.1)	(29.8)
OSB [Member]
Segment Reporting Information [Line Items]
Net sales:	138.8	140.1	411.4	475.5
Operating profit (loss):	(16.0)	(5.0)	(48.0)	38.4
Siding [Member]
Segment Reporting Information [Line Items]
Net sales:	112.0	104.6	336.6	325.0
Operating profit (loss):	11.8	9.3	35.9	39.6
Engineered Wood Products [Member]
Segment Reporting Information [Line Items]
Net sales:	54.9	38.0	156.9	142.7
Operating profit (loss):	(3.2)	(4.9)	(11.9)	(15.9)
Other [Member]
Segment Reporting Information [Line Items]
Net sales:	45.8	41.2	141.6	130.1
Operating profit (loss):	(0.9)	0.7	4.2	4.6
Intersegment elimination [Member]
Segment Reporting Information [Line Items]
Net sales:	(0.9)	(1.1)	(1.8)	(6.0)
Operating profit (loss):	$ 0	$ 0.5	$ 0	$ 0