Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 483.0	$ 320.0
Other comprehensive income (loss)
Other comprehensive income (loss), net of tax	24.0	(6.0)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	508.0	313.0
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest		(1.0)
Comprehensive income (loss) attributed to LP	508.0	314.0
Foreign currency translation adjustments
Other comprehensive income (loss)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	23.0	(7.0)
Amortization of pension and post-retirement prior service costs and net loss
Other comprehensive income (loss)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 1.0	$ 0.0