Selected Segment Data (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Net sales	$ 585.0	$ 582.0
Operating profit (loss):	44.0	22.0
Provision for income taxes	9.0	7.0
Depreciation and amortization	28.0	31.0
Stock-based compensation expense	(2.0)	(2.0)
Impairment of Long-Lived Assets Held-for-use	7.0	1.0
Other operating credits and charges, net	2.0	2.0
Interest expense, net	7.0	(1.0)
Other non-operating items	(5.0)	(11.0)
Income from continuing operations attributed to LP	83.0	58.0
Siding [Member]
Segment Reporting Information [Line Items]
Net sales	212.0	219.0
Operating profit (loss):	33.0	26.0
Income from continuing operations attributed to LP	42.0	39.0
OSB [Member]
Segment Reporting Information [Line Items]
Net sales	220.0	208.0
Operating profit (loss):
Income from continuing operations attributed to LP	35.0	8.0
EWP [Member]
Segment Reporting Information [Line Items]
Net sales	99.0	90.0
Operating profit (loss):	0.0	1.0
Income from continuing operations attributed to LP	9.0	7.0
South America [Member]
Segment Reporting Information [Line Items]
Net sales	36.0	45.0
Income from continuing operations attributed to LP	7.0	10.0
Other [Member]
Segment Reporting Information [Line Items]
Net sales	18.0	21.0
Operating profit (loss):	33.0	27.0
Income from continuing operations attributed to LP	(3.0)	1.0
Intersegment [Member]
Segment Reporting Information [Line Items]
Net sales	0.0	(1.0)
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Income from continuing operations attributed to LP	$ (7.0)	$ (7.0)

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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