Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 548.0	$ 588.0	$ 1,133.0	$ 1,170.0
Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	220.0	231.0	432.0	450.0
OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	204.0	199.0	424.0	407.0
EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	79.0	107.0	178.0	197.0
South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	38.0	40.0	74.0	85.0
Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	7.0	14.0	25.0	35.0
Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	(3.0)	$ 0.0	$ (4.0)
SmartSide Strand siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	212.0	204.0
SmartSide Strand siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	207.0	200.0
SmartSide Strand siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
SmartSide Strand siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
SmartSide Strand siding [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	5.0	4.0
SmartSide Strand siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
SmartSide Strand siding [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
SmartSide Fiber siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	11.0	25.0
SmartSide Fiber siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	11.0	25.0
SmartSide Fiber siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
SmartSide Fiber siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
SmartSide Fiber siding [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
SmartSide Fiber siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
SmartSide Fiber siding [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
CanExel siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	3.0	7.0
CanExel siding [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
CanExel siding [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
CanExel siding [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
CanExel siding [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
CanExel siding [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	3.0
CanExel siding [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
OSB - value-add [Member]
Disaggregation of Revenue [Line Items]
Net sales	128.0	138.0
OSB - value-add [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
OSB - value-add [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	95.0	100.0
OSB - value-add [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	1.0	2.0
OSB - value-add [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	32.0	35.0
OSB - value-add [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
OSB - value-add [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
LVL [Member]
Disaggregation of Revenue [Line Items]
Net sales	30.0	40.0
LVL [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
LVL [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
LVL [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	30.0	40.0
LVL [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
LVL [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
LVL [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
LSL [Member]
Disaggregation of Revenue [Line Items]
Net sales	9.0	14.0
LSL [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
LSL [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
LSL [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	9.0	14.0
LSL [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
LSL [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
LSL [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0
I Joist [Member]
Disaggregation of Revenue [Line Items]
Net sales	32.0	38.0
I Joist [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
I Joist [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
I Joist [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	32.0	38.0
I Joist [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
I Joist [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
I Joist [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
OSB - commodity [Member]
Disaggregation of Revenue [Line Items]
Net sales	108.0	100.0
OSB - commodity [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	5.0
OSB - commodity [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	108.0	97.0
OSB - commodity [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	1.0
OSB - commodity [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
OSB - commodity [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
OSB - commodity [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	(3.0)
Plywood [Member]
Disaggregation of Revenue [Line Items]
Net sales	3.0	6.0
Plywood [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Plywood [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Plywood [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	3.0	6.0
Plywood [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Plywood [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Plywood [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	12.0
Other [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	2.0
Other [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	1.0
Other [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	4.0
Other [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	1.0
Other [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	4.0
Other [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0
Commodity [Member]
Disaggregation of Revenue [Line Items]
Net sales	111.0	107.0
Commodity [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	5.0
Commodity [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	108.0	97.0
Commodity [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	3.0	7.0
Commodity [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	0.0
Commodity [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	0.0	(3.0)
Value-add [Member]
Disaggregation of Revenue [Line Items]
Net sales	425.0	466.0
Value-add [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales	218.0	225.0
Value-add [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales	95.0	100.0
Value-add [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales	72.0	95.0
Value-add [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales	37.0	39.0
Value-add [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Net sales	3.0	7.0
Value-add [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 0.0	0.0
Other [Member] | Siding [Member]
Disaggregation of Revenue [Line Items]
Net sales		1.0
Other [Member] | OSB [Member]
Disaggregation of Revenue [Line Items]
Net sales		1.0
Other [Member] | EWP [Member]
Disaggregation of Revenue [Line Items]
Net sales		5.0
Other [Member] | South America [Member]
Disaggregation of Revenue [Line Items]
Net sales		1.0
Other [Member] | Intersegment [Member]
Disaggregation of Revenue [Line Items]
Net sales		$ 0.0