Selected Segment Data (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Net sales:	$ 493.0	$ 518.5	$ 964.7	$ 963.2
Operating profit (loss):	(14.1)	(3.9)	(47.3)	(14.1)
Other operating charges and credits, net	0.0	(0.6)	(11.6)	(0.6)
(Gain) loss on sale or impairment of long-lived assets, net	(0.5)	0.5	(0.6)	0.5
Other Selling, General and Administrative Expense	(22.0)	(20.7)	(44.7)	(48.0)
Other non-operating income	0.4	3.8	(1.8)	(0.5)
Interest income	1.0	1.7	2.4	3.5
Interest expense, net of capitalized interest	(7.2)	(7.4)	(14.7)	(15.1)
Loss from operations before taxes	(18.5)	(4.6)	(59.3)	(24.4)
Provision (benefit) for income taxes	1.0	(6.7)	(5.3)	(12.3)
Net loss	(19.5)	2.1	(54.0)	(12.1)
OSB [Member]
Segment Reporting Information [Line Items]
Net sales:	211.0	223.7	401.2	418.6
Operating profit (loss):	(18.1)	(5.5)	(46.5)	(7.4)
Siding [Member]
Segment Reporting Information [Line Items]
Net sales:	163.9	169.7	337.4	313.2
Operating profit (loss):	29.2	25.9	62.1	45.1
Engineered Wood Products [Member]
Segment Reporting Information [Line Items]
Net sales:	72.0	75.9	136.8	138.1
Operating profit (loss):	(2.3)	(5.3)	(6.4)	(8.4)
South America [Member]
Segment Reporting Information [Line Items]
Net sales:	38.7	41.9	74.6	78.5
Operating profit (loss):	2.0	4.0	4.4	8.2
Other [Member]
Segment Reporting Information [Line Items]
Net sales:	7.4	8.7	14.7	16.6
Operating profit (loss):	(1.0)	(1.0)	(1.9)	(1.7)
Intersegment elimination [Member]
Segment Reporting Information [Line Items]
Net sales:	0.0	(1.4)	$ 0.0	$ (1.8)
Unconsolidated Affiliates [Member]
Segment Reporting Information [Line Items]
(Gain) loss on sale or impairment of long-lived assets, net	$ (0.5)	$ 0.5