CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Net trade sales	$ 1,221.2	$ 1,334.2	$ 2,434.8	$ 2,656.5
Cost of goods sold	1,000.1	1,065.8	1,995.1	2,120.8
Gross profit	221.1	268.4	439.7	535.7
Selling and administrative expenses	119.2	105.4	235.2	217.1
Amortization of intangibles	16.8	16.4	33.7	33.4
Other (income) expense, net	(10.6)	3.6	(14.2)	4.6
Earnings before interest and income taxes	95.7	143.0	185.0	280.6
Interest expense	23.1	21.1	45.2	41.8
Interest income	1.1	1.1	2.2	2.3
Earnings before income taxes	73.7	123.0	142.0	241.1
Income taxes	19.5	27.8	34.3	55.5
Net earnings	54.2	95.2	107.7	185.6
(Earnings) attributable to noncontrolling interest, net of tax	0.0	0.0	0.0	0.0
Net earnings attributable to Leggett & Platt, Inc. common shareholders	$ 54.2	$ 95.2	$ 107.7	$ 185.6
Net earnings per share attributable to Leggett & Platt, Inc. common shareholders
Basic (in usd per share)	$ 0.40	$ 0.70	$ 0.79	$ 1.36
Diluted (in usd per share)	$ 0.40	$ 0.70	$ 0.79	$ 1.36
Weighted average shares outstanding
Basic (in shares)	136.2	136.3	136.1	136.4
Diluted (in shares)	136.6	136.7	136.4	136.8