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Selected Segment Data (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Segment Reporting Information [Line Items]        
Net sales: $ 694.1 $ 582.4 $ 1,305.0 $ 1,087.0
Operating profit (loss): 132.9 52.2 205.6 71.1
Other operating credits and charges, net (2.0) (11.4) (5.4) (11.4)
Loss on sale or impairment of long-lived assets, net 3.1 (0.7) 2.5 (0.7)
General corporate and other expenses, net (27.3) (27.2) (55.6) (51.2)
Interest expense, net of capitalized interest (4.9) (9.3) (9.9) (17.3)
Investment income 2.3 2.1 4.3 3.9
Other non-operating items (1.5) 1.4 (1.8) 1.9
Income from operations before taxes 130.5 47.9 201.0 62.6
Provision for income taxes 36.0 16.2 51.5 20.6
Net income 94.5 31.7 149.5 42.0
Siding [Member]        
Segment Reporting Information [Line Items]        
Net sales: 231.0 207.2 445.0 388.5
Operating profit (loss): 48.5 41.8 88.7 68.7
OSB [Member]        
Segment Reporting Information [Line Items]        
Net sales: 325.0 252.8 593.4 469.8
Operating profit (loss): 102.6 44.0 163.0 59.3
Engineered Wood Products [Member]        
Segment Reporting Information [Line Items]        
Net sales: 94.2 78.0 176.3 149.8
Operating profit (loss): 5.1 0.5 5.7 (2.0)
South America [Member]        
Segment Reporting Information [Line Items]        
Net sales: 38.7 41.0 76.5 71.5
Operating profit (loss): 5.5 6.9 10.6 12.0
Other [Member]        
Segment Reporting Information [Line Items]        
Net sales: 7.1 6.6 15.8 12.7
Operating profit (loss): (0.9) (0.2) (1.1) (0.6)
Intersegment elimination [Member]        
Segment Reporting Information [Line Items]        
Net sales: $ (1.9) $ (3.2) $ (2.0) $ (5.3)