Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Net trade sales	$ 4,383.6	$ 4,725.3	$ 5,146.7
Cost of goods sold	3,634.5	3,871.5	4,169.9
Gross profit	749.1	853.8	976.8
Selling and administrative expenses	508.8	465.4	427.3
Amortization of intangibles	22.0	69.0	66.8
Goodwill impairment	676.0	0.0	0.0
Long-lived asset impairment	6.3	443.7	0.0
Net gain from disposal of assets and businesses	(35.6)	(20.1)	(2.5)
Other expense (income), net	1.5	(13.8)	0.2
Earnings (loss) before interest and income taxes	(429.9)	(90.4)	485.0
Interest expense	85.9	88.4	85.5
Interest income	6.6	5.4	4.1
Earnings (loss) before income taxes	(509.2)	(173.4)	403.6
Income taxes	2.2	(36.6)	93.7
Net earnings (loss)	(511.4)	(136.8)	309.9
Earnings attributable to noncontrolling interest, net of tax	(0.1)	0.0	(0.1)
Net earnings (loss) attributable to Leggett & Platt, Inc. common shareholders	$ (511.5)	$ (136.8)	$ 309.8
Net earnings (loss) per share attributable to Leggett & Platt, Inc. common shareholders
Basic (in dollars per share)	$ (3.73)	$ (1.00)	$ 2.28
Diluted (in dollars per share)	$ (3.73)	$ (1.00)	$ 2.27

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Name:	us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(2)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(2)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1