CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net trade sales	$ 845.1	$ 1,213.2	$ 1,890.6	$ 2,368.3
Cost of goods sold	698.8	943.5	1,521.5	1,865.6
Gross profit	146.3	269.7	369.1	502.7
Selling and administrative expenses	97.2	118.3	215.0	236.9
Amortization of intangibles	16.3	16.9	32.7	31.0
Impairments	25.9	1.4	29.4	4.3
Other (income) expense, net	(15.9)	(2.9)	(11.5)	(3.7)
Earnings before interest and income taxes	22.8	136.0	103.5	234.2
Interest expense	21.4	24.5	42.3	45.9
Interest income	1.0	2.6	1.9	4.0
Earnings before income taxes	2.4	114.1	63.1	192.3
Income taxes	8.5	27.8	23.5	44.9
Net earnings (loss)	(6.1)	86.3	39.6	147.4
(Earnings) attributable to noncontrolling interest, net of tax	0.0	(0.1)	0.0	0.0
Net earnings (loss) attributable to Leggett & Platt common shareholders	$ (6.1)	$ 86.2	$ 39.6	$ 147.4
Net earnings (loss) per share attributable to Leggett & Platt, Inc. common shareholders
Basic (in dollars per share)	$ (0.05)	$ 0.64	$ 0.29	$ 1.10
Diluted (in dollars per share)	$ (0.05)	$ 0.64	$ 0.29	$ 1.09
Weighted average shares outstanding
Basic (in shares)	135.7	134.7	135.5	134.5
Diluted (in shares)	135.7	135.2	135.7	135.1