CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Net trade sales	$ 1,322.3	$ 1,150.9
Cost of goods sold	1,055.0	903.4
Gross profit	267.3	247.5
Selling and administrative expenses	111.7	106.3
Amortization of intangibles	17.0	15.8
Other (income) expense, net	1.0	(2.3)
Earnings before interest and income taxes	137.6	127.7
Interest expense	20.7	19.3
Interest income	1.2	0.9
Earnings before income taxes	118.1	109.3
Income taxes	27.7	21.8
Net earnings	90.4	87.5
(Earnings) attributable to noncontrolling interest, net of tax	0.0	0.0
Net earnings attributable to Leggett & Platt, Inc. common shareholders	$ 90.4	$ 87.5
Net earnings per share attributable to Leggett & Platt, Inc. common shareholders
Basic (in usd per share)	$ 0.66	$ 0.64
Diluted (in usd per share)	$ 0.66	$ 0.64
Weighted average shares outstanding
Basic (in shares)	136.6	136.0
Diluted (in shares)	136.9	136.3