Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 795.0	$ 603.0	$ 1,928.0	$ 1,773.0
Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	268.0	244.0	700.0	695.0
OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	368.0	197.0	792.0	605.0
EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	103.0	105.0	281.0	303.0
South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	45.0	36.0	119.0	121.0
Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	11.0	21.0	36.0	53.0
Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	(1.0)	0.0	(4.0)
SmartSide Strand siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	264.0	217.0	670.0	614.0
SmartSide Strand siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	260.0	213.0	658.0	600.0
SmartSide Strand siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
SmartSide Strand siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
SmartSide Strand siding [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	4.0	4.0	12.0	14.0
SmartSide Strand siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
SmartSide Strand siding [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
SmartSide Fiber siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	6.0	28.0	36.0	79.0
SmartSide Fiber siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	6.0	28.0	36.0	79.0
SmartSide Fiber siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
SmartSide Fiber siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
SmartSide Fiber siding [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
SmartSide Fiber siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
SmartSide Fiber siding [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
CanExel siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	15.0	14.0	38.0
CanExel siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
CanExel siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
CanExel siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
CanExel siding [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
CanExel siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	15.0	14.0	38.0
CanExel siding [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
OSB - value-add [Member]
Disaggregation of Revenue [Line Items]
Net sales	202.0	130.0	466.0	406.0
OSB - value-add [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
OSB - value-add [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	162.0	96.0	360.0	295.0
OSB - value-add [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	2.0	2.0	7.0
OSB - value-add [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	40.0	32.0	104.0	105.0
OSB - value-add [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
OSB - value-add [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
LVL [Member]
Disaggregation of Revenue [Line Items]
Net sales	35.0	37.0	101.0	108.0
LVL [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
LVL [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
LVL [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	35.0	37.0	101.0	108.0
LVL [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
LVL [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
LVL [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
LSL [Member]
Disaggregation of Revenue [Line Items]
Net sales	14.0	12.0	35.0	40.0
LSL [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
LSL [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
LSL [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	14.0	12.0	35.0	40.0
LSL [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
LSL [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
LSL [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
I Joist [Member]
Disaggregation of Revenue [Line Items]
Net sales	37.0	39.0	106.0	103.0
I Joist [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
I Joist [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
I Joist [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	37.0	39.0	106.0	103.0
I Joist [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
I Joist [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
I Joist [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
OSB - commodity [Member]
Disaggregation of Revenue [Line Items]
Net sales	198.0	100.0	419.0	312.0
OSB - commodity [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	1.0	0.0	9.0
OSB - commodity [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	198.0	100.0	419.0	304.0
OSB - commodity [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	3.0
OSB - commodity [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
OSB - commodity [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
OSB - commodity [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	(1.0)	0.0	(4.0)
Plywood [Member]
Disaggregation of Revenue [Line Items]
Net sales	7.0	7.0	16.0	19.0
Plywood [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Plywood [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Plywood [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	7.0	7.0	16.0	19.0
Plywood [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Plywood [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Plywood [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	32.0		65.0
Other [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	2.0		6.0
Other [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	8.0		13.0
Other [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	10.0		21.0
Other [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	1.0		3.0
Other [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	11.0		22.0
Other [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0		0.0
Commodity [Member]
Disaggregation of Revenue [Line Items]
Net sales	205.0	107.0	435.0	331.0
Commodity [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	1.0	0.0	9.0
Commodity [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	198.0	100.0	419.0	304.0
Commodity [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	7.0	7.0	16.0	22.0
Commodity [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0	0.0	0.0
Commodity [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	(1.0)	0.0	(4.0)
Value-add [Member]
Disaggregation of Revenue [Line Items]
Net sales	558.0	478.0	1,428.0	1,387.0
Value-add [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	266.0	241.0	694.0	679.0
Value-add [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	162.0	96.0	360.0	295.0
Value-add [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	86.0	91.0	244.0	257.0
Value-add [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	44.0	36.0	116.0	119.0
Value-add [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	15.0	14.0	38.0
Value-add [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 0.0	0.0	$ 0.0	0.0
Other [Member]
Disaggregation of Revenue [Line Items]
Net sales		19.0		55.0
Other [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales		2.0		7.0
Other [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales		2.0		6.0
Other [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales		8.0		23.0
Other [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales		1.0		2.0
Other [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales		6.0		16.0
Other [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 0.0		$ 0.0