CONSOLIDATED CONDENSED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Net sales	$ 1,213.2	$ 1,102.5	$ 2,368.3	$ 2,131.3
Cost of goods sold	943.5	871.5	1,865.6	1,682.9
Gross profit	269.7	231.0	502.7	448.4
Selling and administrative expenses	118.3	107.8	236.9	212.5
Amortization of intangibles	16.9	5.1	31.0	10.1
Impairments	1.4	0.0	4.3	0.2
Other (income) expense, net	(2.9)	(3.0)	(3.7)	(2.9)
Earnings before interest and income taxes	136.0	121.1	234.2	228.5
Interest expense	24.5	16.0	45.9	30.4
Interest income	2.6	2.4	4.0	4.8
Earnings before income taxes	114.1	107.5	192.3	202.9
Income taxes	27.8	22.4	44.9	39.9
Net earnings	86.3	85.1	147.4	163.0
Loss attributable to noncontrolling interest, net of tax	(0.1)	(0.1)	0.0	(0.1)
Net earnings attributable to Leggett & Platt, Inc. common shareholders	$ 86.2	$ 85.0	$ 147.4	$ 162.9
Net earnings per share attributable to Leggett & Platt, Inc. common shareholders
Basic (in dollars per share)	$ 0.64	$ 0.63	$ 1.10	$ 1.21
Diluted (in dollars per share)	$ 0.64	$ 0.63	$ 1.09	$ 1.20
Weighted average shares outstanding
Basic (in shares)	134.7	134.1	134.5	134.7
Diluted (in shares)	135.2	135.0	135.1	135.7