Selected Segment Data (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 795.0	$ 603.0	$ 1,928.0	$ 1,773.0
Operating profit (loss):	242.0	8.0	339.0	53.0
Provision for income taxes	60.0	3.0	88.0	13.0
Depreciation and amortization	28.0	29.0		89.0
Depreciation and amortization	28.0	30.0	84.0	90.0
Stock-based compensation expense	(5.0)	(2.0)	(8.0)	(6.0)
Impairment of Long-Lived Assets Held-for-use	1.0	5.0	15.0	6.0
Other operating income (expense) exclusive of product discontinuance charges	(2.0)	(3.0)	(4.0)	(2.0)
Investment income	0.0	(2.0)	(3.0)	(9.0)
Other non-operating items	0.0	1.0	(4.0)	(8.0)
Product line discontinuance charges	1.0	0.0	9.0	0.0
Interest Expense	5.0	6.0	17.0	14.0
Income from continuing operations attributed to LP	273.0	49.0	453.0	160.0
Siding [Member]
Segment Reporting Information [Line Items]
Net sales	268.0	244.0	700.0	695.0
Operating profit (loss):	177.0	1.0	241.0	42.0
Income from continuing operations attributed to LP	76.0	44.0	169.0	128.0
OSB [Member]
Segment Reporting Information [Line Items]
Net sales	368.0	197.0	792.0	605.0
Income from continuing operations attributed to LP	189.0	(1.0)	270.0	4.0
EWP [Member]
Segment Reporting Information [Line Items]
Net sales	103.0	105.0	281.0	303.0
Operating profit (loss):	0.0	1.0	2.0	3.0
Income from continuing operations attributed to LP	9.0	6.0	21.0	22.0
South America [Member]
Segment Reporting Information [Line Items]
Net sales	45.0	36.0	119.0	121.0
Income from continuing operations attributed to LP	11.0	7.0	29.0	27.0
Other [Member]
Segment Reporting Information [Line Items]
Net sales	11.0	21.0	36.0	53.0
Operating profit (loss):	177.0	2.0	243.0	46.0
Income from continuing operations attributed to LP	(5.0)	(1.0)	(13.0)	(1.0)
Intersegment [Member]
Segment Reporting Information [Line Items]
Net sales	0.0	(1.0)	0.0	(4.0)
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Income from continuing operations attributed to LP	$ (7.0)	$ (6.0)	$ (23.0)	$ (20.0)

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