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Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 1,017.0	$ 585.0
Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	285.0	212.0
OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	539.0	220.0
EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	123.0	99.0
Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	18.0	18.0
South America
Disaggregation of Revenue [Line Items]
Net sales	53.0	36.0
Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member]
Disaggregation of Revenue [Line Items]
Net sales	687.0	434.0
Value-add [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	284.0	210.0
Value-add [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	254.0	103.0
Value-add [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	100.0	86.0
Value-add [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	50.0	35.0
Value-add [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | SmartSide siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	293.0	194.0
Value-add [Member] | SmartSide siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	283.0	191.0
Value-add [Member] | SmartSide siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | SmartSide siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | SmartSide siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | SmartSide siding [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	9.0	3.0
Value-add [Member] | SmartSide siding [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | OSB -Structural Solutions [Member]
Disaggregation of Revenue [Line Items]
Net sales	295.0	136.0
Value-add [Member] | OSB -Structural Solutions [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | OSB -Structural Solutions [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	254.0	103.0
Value-add [Member] | OSB -Structural Solutions [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	1.0
Value-add [Member] | OSB -Structural Solutions [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | OSB -Structural Solutions [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	41.0	32.0
Value-add [Member] | OSB -Structural Solutions [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | I Joist [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	48.0	37.0
Value-add [Member] | LVL [Member]
Disaggregation of Revenue [Line Items]
Net sales	43.0	36.0
Value-add [Member] | LVL [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | LVL [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | LVL [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	43.0	36.0
Value-add [Member] | LVL [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | LVL [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | LVL [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | LSL [Member]
Disaggregation of Revenue [Line Items]
Net sales	8.0	12.0
Value-add [Member] | LSL [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | LSL [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | LSL [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	8.0	12.0
Value-add [Member] | LSL [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | LSL [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | LSL [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Value-add [Member] | SmartSide Fiber siding [Member]
Disaggregation of Revenue [Line Items]
Net sales		19.0
Value-add [Member] | SmartSide Fiber siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales		19.0
Value-add [Member] | SmartSide Fiber siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales		0.0
Value-add [Member] | SmartSide Fiber siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales		0.0
Value-add [Member] | SmartSide Fiber siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales		0.0
Value-add [Member] | SmartSide Fiber siding [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales		0.0
Value-add [Member] | SmartSide Fiber siding [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales		0.0
Commodity
Disaggregation of Revenue [Line Items]
Net sales	294.0	119.0
Commodity | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	282.0	113.0
Commodity | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	13.0	6.0
Commodity | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity | South America
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity | OSB - commodity [Member]
Disaggregation of Revenue [Line Items]
Net sales	281.0	113.0
Commodity | OSB - commodity [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity | OSB - commodity [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	282.0	113.0
Commodity | OSB - commodity [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity | OSB - commodity [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity | OSB - commodity [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity | OSB - commodity [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales		0.0
Commodity | Plywood [Member]
Disaggregation of Revenue [Line Items]
Net sales	13.0	6.0
Commodity | Plywood [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity | Plywood [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity | Plywood [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	13.0	6.0
Commodity | Plywood [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity | Plywood [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity | Plywood [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Other Product Types | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	36.0	21.0
Other Product Types | Other [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	1.0	2.0
Other Product Types | Other [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	3.0	4.0
Other Product Types | Other [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	11.0	7.0
Other Product Types | Other [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	18.0	7.0
Other Product Types | Other [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	3.0	1.0
Other Product Types | Other [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	$ 0.0	0.0
Other Product Types | SmartSide Fiber siding [Member]
Disaggregation of Revenue [Line Items]
Net sales		11.0
Other Product Types | SmartSide Fiber siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales		0.0
Other Product Types | SmartSide Fiber siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales		0.0
Other Product Types | SmartSide Fiber siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales		0.0
Other Product Types | SmartSide Fiber siding [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales		0.0
Other Product Types | SmartSide Fiber siding [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales		0.0
Other Product Types | CanExel siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 11.0

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