Consolidated Statements of Changes in Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Contributed Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Non- controlling Interest
Beginning balance (in shares) at Dec. 31, 2022		198.8
Balance, beginning of period at Dec. 31, 2022	$ 1,641.4	$ 2.0	$ 568.5	$ 3,046.0	$ (93.5)	$ (1,882.3)	$ 0.7
Beginning balance (in shares) at Dec. 31, 2022						(66.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to Leggett & Platt, Inc. common shareholders	(136.8)			(136.8)
Dividends declared	(242.4)		5.7	(248.1)
Treasury stock purchased, (in shares)						(0.2)
Treasury stock purchased	(6.4)					$ (6.4)
Treasury stock issued, (in shares)						1.0
Treasury stock issued	5.7		(21.1)			$ 26.8
Other comprehensive income (loss), net of tax	49.8				49.8
Stock-based compensation, net of tax	22.7		22.7
Ending balance (in shares) at Dec. 31, 2023		198.8
Balance, end of period at Dec. 31, 2023	1,334.0	$ 2.0	575.8	2,661.1	(43.7)	$ (1,861.9)	0.7
Ending balance (in shares) at Dec. 31, 2023						(65.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to Leggett & Platt, Inc. common shareholders	(511.4)			(511.5)			0.1
Dividends declared	(81.7)		3.4	(85.1)
Treasury stock purchased, (in shares)						(0.3)
Treasury stock purchased	(4.9)					$ (4.9)
Treasury stock issued, (in shares)						1.3
Treasury stock issued	4.8		(32.0)			$ 36.8
Other comprehensive income (loss), net of tax	(72.1)				(72.1)
Stock-based compensation, net of tax	21.5		21.5
Ending balance (in shares) at Dec. 31, 2024		198.8
Balance, end of period at Dec. 31, 2024	$ 690.2	$ 2.0	568.7	2,064.5	(115.8)	$ (1,830.0)	0.8
Ending balance (in shares) at Dec. 31, 2024	(64.4)					(64.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to Leggett & Platt, Inc. common shareholders	$ 235.4			235.4
Dividends declared	(27.3)		0.7	(27.7)			(0.3)
Treasury stock purchased, (in shares)						(0.3)
Treasury stock purchased	(2.4)					$ (2.4)
Treasury stock issued, (in shares)						1.3
Treasury stock issued	3.3		(35.7)			$ 39.0
Other comprehensive income (loss), net of tax	106.8				106.8
Stock-based compensation, net of tax	16.6		16.6
Ending balance (in shares) at Dec. 31, 2025		198.8
Balance, end of period at Dec. 31, 2025	$ 1,022.6	$ 2.0	$ 550.3	$ 2,272.2	$ (9.0)	$ (1,793.4)	$ 0.5
Ending balance (in shares) at Dec. 31, 2025	(63.3)					(63.4)