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Selected Segment Data (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Net sales: $ 610.9 $ 504.6
Operating profit (loss): 72.7 18.9
Other operating credits and charges, net (3.4) 0.0
Loss on sale or impairment of long-lived assets, net (0.6) 0.0
General corporate and other expenses, net (28.3) (24.0)
Interest expense, net of capitalized interest (5.0) (8.0)
Investment income 2.0 1.8
Other non-operating items (0.3) 0.5
Income from operations before taxes 70.5 14.7
Provision for income taxes 15.5 4.4
Net income 55.0 10.3
OSB [Member]    
Segment Reporting Information [Line Items]    
Net sales: 268.4 217.0
Operating profit (loss): 60.4 15.3
Siding [Member]    
Segment Reporting Information [Line Items]    
Net sales: 214.0 181.3
Operating profit (loss): 40.2 26.9
Engineered Wood Products [Member]    
Segment Reporting Information [Line Items]    
Net sales: 82.1 71.8
Operating profit (loss): 0.6 (2.5)
South America [Member]    
Segment Reporting Information [Line Items]    
Net sales: 37.8 30.5
Operating profit (loss): 5.1 5.1
Other [Member]    
Segment Reporting Information [Line Items]    
Net sales: 8.7 6.1
Operating profit (loss): (0.2) (0.4)
Intersegment elimination [Member]    
Segment Reporting Information [Line Items]    
Net sales: $ (0.1) $ (2.1)