Selected Segment Data (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 548.0	$ 588.0	$ 1,133.0	$ 1,170.0
Operating profit (loss):	53.0	23.0	97.0	45.0
Provision for income taxes	19.0	3.0	28.0	11.0
Depreciation and amortization	28.0	29.0	56.0	60.0
Stock-based compensation expense	(1.0)	(3.0)	(3.0)	(5.0)
Impairment of Long-Lived Assets Held-for-use	7.0	0.0	14.0	1.0
Other operating income (expense) exclusive of product discontinuance charges	4.0	3.0	2.0	1.0
Other operating credits and charges, net	6.0	(3.0)	8.0	(1.0)
Investment income	(4.0)	(2.0)	(3.0)	(7.0)
Other non-operating items	1.0	2.0	(4.0)	(9.0)
Product line discontinuance charges	10.0	0.0	10.0	0.0
Interest Expense	6.0	4.0	12.0	8.0
Income from continuing operations attributed to LP	97.0	53.0	180.0	111.0
Siding [Member]
Segment Reporting Information [Line Items]
Net sales	220.0	231.0	432.0	450.0
Operating profit (loss):	31.0	16.0	64.0	42.0
Income from continuing operations attributed to LP	51.0	45.0	93.0	84.0
OSB [Member]
Segment Reporting Information [Line Items]
Net sales	204.0	199.0	424.0	407.0
Income from continuing operations attributed to LP	46.0	(3.0)	81.0	5.0
EWP [Member]
Segment Reporting Information [Line Items]
Net sales	79.0	107.0	178.0	197.0
Operating profit (loss):	2.0	2.0	2.0	2.0
Income from continuing operations attributed to LP	3.0	10.0	12.0	17.0
South America [Member]
Segment Reporting Information [Line Items]
Net sales	38.0	40.0	74.0	85.0
Income from continuing operations attributed to LP	11.0	9.0	18.0	19.0
Other [Member]
Segment Reporting Information [Line Items]
Net sales	7.0	14.0	25.0	35.0
Operating profit (loss):	33.0	17.0	66.0	44.0
Income from continuing operations attributed to LP	(5.0)	(1.0)	(8.0)	0.0
Intersegment [Member]
Segment Reporting Information [Line Items]
Net sales	0.0	(3.0)	0.0	(4.0)
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Income from continuing operations attributed to LP	$ (9.0)	$ (7.0)	$ (16.0)	$ (14.0)

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