Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 1,325.0	$ 548.0	$ 2,342.0	$ 1,133.0
Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	291.0	220.0	576.0	432.0
OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	778.0	204.0	1,317.0	424.0
EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	158.0	79.0	280.0	178.0
Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	26.0	7.0	43.0	25.0
South America
Disaggregation of Revenue [Line Items]
Net sales	74.0	38.0	126.0	74.0
Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	(1.0)	0.0
Value-add [Member]
Disaggregation of Revenue [Line Items]
Net sales	843.0	411.0	1,529.0	826.0
Value-add [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	288.0		570.0
Value-add [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	350.0	95.0	605.0	198.0
Value-add [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	132.0	72.0	231.0	158.0
Value-add [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	74.0	37.0	124.0	72.0
Value-add [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | SmartSide siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	298.0	212.0	589.0	406.0
Value-add [Member] | SmartSide siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	288.0	207.0	570.0	398.0
Value-add [Member] | SmartSide siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | SmartSide siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | SmartSide siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | SmartSide siding [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	10.0	5.0	20.0	8.0
Value-add [Member] | SmartSide siding [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | OSB -Structural Solutions [Member]
Disaggregation of Revenue [Line Items]
Net sales	414.0	128.0	709.0	264.0
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	350.0	95.0	605.0	198.0
Value-add [Member] | OSB -Structural Solutions [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	1.0	0.0	2.0
Value-add [Member] | OSB -Structural Solutions [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | OSB -Structural Solutions [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	63.0	32.0	104.0	64.0
Value-add [Member] | OSB -Structural Solutions [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | I Joist [Member]
Disaggregation of Revenue [Line Items]
Net sales	75.0		123.0
Value-add [Member] | I Joist [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	75.0	32.0	123.0	69.0
Value-add [Member] | LVL [Member]
Disaggregation of Revenue [Line Items]
Net sales	45.0	30.0	89.0	66.0
Value-add [Member] | LVL [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | LVL [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | LVL [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	45.0	30.0	89.0	66.0
Value-add [Member] | LVL [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | LVL [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | LVL [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | LSL [Member]
Disaggregation of Revenue [Line Items]
Net sales	11.0	9.0	19.0	21.0
Value-add [Member] | LSL [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | LSL [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | LSL [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	11.0	9.0	19.0	21.0
Value-add [Member] | LSL [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | LSL [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Value-add [Member] | LSL [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity
Disaggregation of Revenue [Line Items]
Net sales	445.0	111.0	739.0	230.0
Commodity | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	425.0	108.0	707.0	221.0
Commodity | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	19.0	3.0	32.0	9.0
Commodity | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity | South America
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity | OSB - commodity [Member]
Disaggregation of Revenue [Line Items]
Net sales	425.0	108.0	707.0	221.0
Commodity | OSB - commodity [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity | OSB - commodity [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	425.0	108.0	707.0	221.0
Commodity | OSB - commodity [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity | OSB - commodity [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity | OSB - commodity [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity | OSB - commodity [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales		0.0		0.0
Commodity | Plywood [Member]
Disaggregation of Revenue [Line Items]
Net sales	19.0	3.0	32.0	9.0
Commodity | Plywood [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity | Plywood [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity | Plywood [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	19.0	3.0	32.0	9.0
Commodity | Plywood [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity | Plywood [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity | Plywood [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Other Product Types | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	38.0	23.0	75.0	63.0
Other Product Types | Other [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	3.0		6.0
Other Product Types | Other [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	2.0		5.0
Other Product Types | Other [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	7.0		17.0
Other Product Types | Other [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	26.0	4.0	43.0	11.0
Other Product Types | Other [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	0.0		3.0
Other Product Types | Other [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales	$ 0.0		$ (1.0)
Other Product Types | SmartSide Fiber siding [Member]
Disaggregation of Revenue [Line Items]
Net sales		3.0		14.0
Other Product Types | SmartSide Fiber siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales		0.0		0.0
Other Product Types | SmartSide Fiber siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales		0.0		0.0
Other Product Types | SmartSide Fiber siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales		0.0		0.0
Other Product Types | SmartSide Fiber siding [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales		0.0		0.0
Other Product Types | SmartSide Fiber siding [Member] | Intersegment
Disaggregation of Revenue [Line Items]
Net sales		0.0		0.0
Other Product Types | CanExel siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 3.0		14.0
Other [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales				5.0
Other [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales				$ 2.0