Consolidated Statement of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 1,219.0	$ 795.0	$ 3,561.0	$ 1,928.0
Cost of sales	(670.0)	(503.0)	(1,827.0)	(1,411.0)
Gross Profit	549.0	292.0	1,734.0	517.0
Selling, general, and administrative expenses	(63.0)	(52.0)	(168.0)	(157.0)
Loss on impairment	0.0	(1.0)	0.0	(16.0)
Other Operating Charges And Credits, Net	2.0	3.0	5.0	(5.0)
Income from operations	488.0	242.0	1,571.0	339.0
Non-operating income (expense):
Interest Expense	(4.0)	(5.0)	(12.0)	(17.0)
Investment income	0.0	0.0	1.0	3.0
Other non-operating items	2.0	0.0	(14.0)	4.0
Income before income taxes	486.0	237.0	1,546.0	329.0
Provision for income taxes	(123.0)	(60.0)	(366.0)	(88.0)
Income (Loss) from Equity Method Investments, Net of Dividends or Distributions	1.0	0.0	3.0	0.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total	365.0	177.0	1,182.0	241.0
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	0.0	0.0	1.0	2.0
Net income attributed to LP	$ 365.0	$ 177.0	$ 1,183.0	$ 243.0
Basic net income per share of common stock:
Net income per share - basic	$ 3.90	$ 1.58	$ 11.81	$ 2.16
Net income per share - diluted	$ 3.87	$ 1.57	$ 11.73	$ 2.15
Diluted net income per share of common stock
Basic	94,000,000	112,000,000	100,000,000	112,000,000
Weighted average shares of stock outstanding - diluted	94,000,000	113,000,000	101,000,000	113,000,000