Selected Segment Data (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Net sales:	$ 427.8	$ 362.4	$ 789.3	$ 694.1
Operating profit (loss):	19.0	(23.6)	16.9	(41.8)
Other operating credits and charges, net	(0.2)	0.6	0	1.4
Gain (loss) on sale or impairment of long-lived assets	(0.1)	(2.5)	(0.2)	(8.0)
General corporate and other expenses, net	(18.2)	(16.5)	(38.2)	(34.5)
Foreign currency gains (losses)	(2.6)	0.6	(2.7)	2.4
Gains (Losses) on Extinguishment of Debt	(52.2)	0	(52.2)	0
Investment income	3.4	3.5	7.6	7.5
Interest expense, net of capitalized interest	(13.1)	(14.4)	(25.7)	(28.4)
Loss from continuing operations before taxes	(48.3)	(41.3)	(60.7)	(71.0)
Provision (benefit) for income taxes	(11.1)	(8.4)	(12.3)	(15.2)
Income (loss) from continuing operations	(37.2)	(32.9)	(48.4)	(55.8)
OSB [Member]
Segment Reporting Information [Line Items]
Net sales:	194.9	140.6	344.4	272.6
Operating profit (loss):	17.0	(22.9)	16.7	(32.0)
Siding [Member]
Segment Reporting Information [Line Items]
Net sales:	137.0	118.6	250.1	224.7
Operating profit (loss):	19.4	11.3	36.1	24.0
Engineered Wood Products [Member]
Segment Reporting Information [Line Items]
Net sales:	51.7	53.6	100.3	101.9
Operating profit (loss):	(3.4)	(3.2)	(6.3)	(8.7)
South America [Member]
Segment Reporting Information [Line Items]
Net sales:	42.7	39.5	85.1	74.9
Operating profit (loss):	3.6	4.2	6.7	7.9
Other [Member]
Segment Reporting Information [Line Items]
Net sales:	10.7	10.4	20.8	20.9
Operating profit (loss):	(1.9)	(2.0)	(2.5)	(2.6)
Intersegment elimination [Member]
Segment Reporting Information [Line Items]
Net sales:	$ (9.2)	$ (0.3)	$ (11.4)	$ (0.9)