CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Net trade sales	$ 1,213.6	$ 1,322.3
Cost of goods sold	995.0	1,055.0
Gross profit	218.6	267.3
Selling and administrative expenses	116.0	111.7
Amortization of intangibles	16.9	17.0
Net gain from sale of assets and businesses	(0.3)	(0.6)
Other (income) expense, net	(3.3)	1.6
Earnings before interest and income taxes	89.3	137.6
Interest expense	22.1	20.7
Interest income	1.1	1.2
Earnings before income taxes	68.3	118.1
Income taxes	14.8	27.7
Net earnings	53.5	90.4
(Earnings) attributable to noncontrolling interest, net of tax	0.0	0.0
Net earnings attributable to Leggett & Platt, Inc. common shareholders	$ 53.5	$ 90.4
Net earnings per share attributable to Leggett & Platt, Inc. common shareholders
Basic (in usd per share)	$ 0.39	$ 0.66
Diluted (in usd per share)	$ 0.39	$ 0.66
Weighted average shares outstanding
Basic (in shares)	135.9	136.6
Diluted (in shares)	136.3	136.9