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Selected Segment Data (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Net sales: $ 736.8 $ 718.3 $ 2,238.9 $ 2,023.3
Operating profit (loss): 167.6 161.5 509.8 373.0
Other operating credits and charges, net 6.3 0.9 11.2 (4.5)
Gain (loss) on sale or impairment of long-lived assets, net (0.3) (0.7) 0.3 1.8
General corporate and other expenses, net (27.9) (29.5) (82.8) (84.1)
Interest expense, net of capitalized interest (3.9) (4.9) (12.7) (14.8)
Investment income 5.5 2.9 13.5 7.2
Other non-operating items (2.2) (2.2) (4.3) (7.2)
Income from continuing operations before taxes 165.9 157.3 504.6 358.2
Provision for income taxes 41.8 46.4 122.7 97.9
Income from continuing operations 124.1 110.9 381.9 260.3
Siding [Member]        
Segment Reporting Information [Line Items]        
Net sales: 240.8 226.2 729.4 671.2
Operating profit (loss): 59.8 53.3 167.8 142.9
OSB [Member]        
Segment Reporting Information [Line Items]        
Net sales: 349.1 350.9 1,049.8 944.3
Operating profit (loss): 114.8 126.8 369.6 290.6
EWP [Member]        
Segment Reporting Information [Line Items]        
Net sales: 104.8 98.1 314.6 274.4
Operating profit (loss): 8.5 6.5 19.9 12.6
South America [Member]        
Segment Reporting Information [Line Items]        
Net sales: 34.5 38.3 122.2 114.8
Operating profit (loss): 6.5 5.8 25.0 16.4
Other [Member]        
Segment Reporting Information [Line Items]        
Net sales: 7.6 6.5 22.9 22.3
Operating profit (loss): (1.2) (1.6) (2.9) (2.7)
Intersegment [Member]        
Segment Reporting Information [Line Items]        
Net sales: $ 0.0 $ (1.7) $ 0.0 $ (3.7)