CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Net trade sales	$ 1,175.4	$ 1,294.4	$ 3,610.2	$ 3,950.9
Cost of goods sold	961.1	1,063.9	2,956.2	3,184.7
Gross profit	214.3	230.5	654.0	766.2
Selling and administrative expenses	109.1	100.4	344.3	317.5
Amortization of intangibles	17.9	16.6	51.6	50.0
Other expense (income)	(4.1)	0.3	(18.3)	4.9
Earnings before interest and income taxes	91.4	113.2	276.4	393.8
Interest expense	22.0	20.5	67.2	62.3
Interest income	1.5	0.8	3.7	3.1
Earnings before income taxes	70.9	93.5	212.9	334.6
Income taxes	18.0	22.0	52.3	77.5
Net earnings	52.9	71.5	160.6	257.1
(Earnings) attributable to noncontrolling interest, net of tax	(0.1)	(0.1)	(0.1)	(0.1)
Net earnings attributable to Leggett & Platt, Inc. common shareholders	$ 52.8	$ 71.4	$ 160.5	$ 257.0
Net earnings per share attributable to Leggett & Platt, Inc. common shareholders
Basic (in usd per share)	$ 0.39	$ 0.53	$ 1.18	$ 1.89
Diluted (in usd per share)	$ 0.39	$ 0.52	$ 1.18	$ 1.88
Weighted average shares outstanding
Basic (in shares)	136.4	135.7	136.2	136.2
Diluted (in shares)	136.8	136.1	136.5	136.6