Selected Segment Data (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 1,219.0			$ 795.0			$ 3,561.0	$ 1,928.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	365.0			177.0			1,182.0	241.0
Net loss attributed to noncontrolling interest	0.0			0.0			1.0	2.0
Net Income (Loss) Attributable to Parent	365.0	$ 498.0	$ 320.0	177.0	$ 33.0	$ 33.0	1,183.0	243.0
Provision for income taxes	123.0			60.0			366.0	88.0
Depreciation and amortization	30.0			28.0			88.0	84.0
Stock-based compensation expense	(5.0)			(5.0)			(10.0)	(8.0)
Asset impairment attributable to parent	0.0			1.0			0.0	15.0
Other operating income (expense) exclusive of product discontinuance charges	(2.0)			(2.0)			(5.0)	(4.0)
Product line discontinuance charges	0.0			(1.0)			0.0	9.0
Gain (Loss) on Extinguishment of Debt	0.0			0.0			11.0	0.0
Interest Expense	4.0			5.0			12.0	17.0
Investment income, net of adjustments	0.0			0.0
Other Nonoperating Income Expense, Net of Debt Extinguishment	2.0			0.0			(3.0)	4.0
Adjusted EBITDA	522.0			273.0			1,667.0	453.0
Value-add [Member]
Segment Reporting Information [Line Items]
Net sales	871.0			552.0			2,402.0	1,378.0
Value-add [Member] | LSL [Member]
Segment Reporting Information [Line Items]
Net sales	20.0			14.0			39.0	35.0
Siding [Member]
Segment Reporting Information [Line Items]
Net sales	312.0			268.0			889.0	700.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest							1,182.0	241.0
Adjusted EBITDA	73.0			76.0			240.0	169.0
Siding [Member] | Value-add [Member]
Segment Reporting Information [Line Items]
Net sales	310.0						879.0
Siding [Member] | Value-add [Member] | LSL [Member]
Segment Reporting Information [Line Items]
Net sales	0.0			0.0			0.0	0.0
OSB [Member]
Segment Reporting Information [Line Items]
Net sales	600.0			368.0			1,917.0	792.0
Adjusted EBITDA	381.0			189.0			1,300.0	270.0
OSB [Member] | Value-add [Member]
Segment Reporting Information [Line Items]
Net sales	307.0			162.0			912.0	360.0
OSB [Member] | Value-add [Member] | LSL [Member]
Segment Reporting Information [Line Items]
Net sales	0.0			0.0			0.0	0.0
EWP [Member]
Segment Reporting Information [Line Items]
Net sales	201.0			103.0			481.0	281.0
Net loss attributed to noncontrolling interest							1.0	2.0
Adjusted EBITDA	42.0			9.0			68.0	21.0
EWP [Member] | Value-add [Member]
Segment Reporting Information [Line Items]
Net sales	180.0			86.0			411.0	244.0
EWP [Member] | Value-add [Member] | LSL [Member]
Segment Reporting Information [Line Items]
Net sales	20.0			14.0			39.0	35.0
Other [Member]
Segment Reporting Information [Line Items]
Net sales	30.0			11.0			73.0	36.0
Net Income (Loss) Attributable to Parent	365.0			177.0			1,183.0	243.0
Adjusted EBITDA	(3.0)			(5.0)			(11.0)	(13.0)
Other [Member] | Value-add [Member]
Segment Reporting Information [Line Items]
Net sales	0.0			0.0			0.0	0.0
Other [Member] | Value-add [Member] | LSL [Member]
Segment Reporting Information [Line Items]
Net sales	0.0			0.0			0.0	0.0
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Adjusted EBITDA	(8.0)			(7.0)			(22.0)	(23.0)
Intersegment
Segment Reporting Information [Line Items]
Net sales	(1.0)			0.0			(2.0)	0.0
Intersegment | Value-add [Member]
Segment Reporting Information [Line Items]
Net sales	(1.0)			0.0			(2.0)	0.0
Intersegment | Value-add [Member] | LSL [Member]
Segment Reporting Information [Line Items]
Net sales	(1.0)			0.0			(2.0)	0.0
South America
Segment Reporting Information [Line Items]
Net sales	76.0			45.0			203.0	119.0
Adjusted EBITDA	37.0			11.0			91.0	29.0
South America | Value-add [Member]
Segment Reporting Information [Line Items]
Net sales	75.0			44.0			200.0	116.0
South America | Value-add [Member] | LSL [Member]
Segment Reporting Information [Line Items]
Net sales	$ 0.0			$ 0.0			$ 0.0	$ 0.0