Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Statement [Abstract]
Net trade sales	$ 4,055.1	$ 4,383.6	$ 4,725.3
Cost of goods sold	3,311.0	3,634.5	3,871.5
Gross profit	744.1	749.1	853.8
Selling and administrative expenses	488.3	508.8	465.4
Amortization of intangibles	16.2	22.0	69.0
Goodwill impairment	0.0	676.0	0.0
Long-lived asset impairment	19.0	6.3	443.7
Gain on sale of Aerospace Products Group	(90.9)	0.0	0.0
Net gain on disposal of assets and businesses	(64.1)	(35.6)	(20.1)
Pension settlement	22.0	0.7	0.0
Other (income) expense, net	(2.4)	0.8	(13.8)
Earnings (loss) before interest and income taxes	356.0	(429.9)	(90.4)
Interest expense	72.9	85.9	88.4
Interest income	6.6	6.6	5.4
Earnings (loss) before income taxes	289.7	(509.2)	(173.4)
Income taxes	54.3	2.2	(36.6)
Net earnings (loss)	235.4	(511.4)	(136.8)
Earnings attributable to noncontrolling interest, net of tax	0.0	(0.1)	0.0
Net earnings (loss) attributable to Leggett & Platt, Inc. common shareholders	$ 235.4	$ (511.5)	$ (136.8)
Net earnings (loss) per share attributable to Leggett & Platt, Inc. common shareholders
Basic (in dollars per share)	$ 1.70	$ (3.73)	$ (1.00)
Diluted (in dollars per share)	$ 1.69	$ (3.73)	$ (1.00)