Segment Information (Summary of Segment Results from Continuing Operations) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Net trade sales		$ 4,055,100,000	$ 4,383,600,000	$ 4,725,300,000
Long-lived asset impairment		19,000,000.0	6,300,000	443,700,000
Goodwill impairment	$ 675,300,000	0	676,000,000.0	0
Gain on sale of Aerospace Products Group		(90,900,000)	0	0
Net gain from insurance proceeds		(34,700,000)
Earnings (loss) before interest and income taxes		356,000,000.0	(429,900,000)	(90,400,000)
Interest expense net of interest income		(66,300,000)	(79,300,000)	(83,000,000.0)
Earnings (loss) before income taxes		289,700,000	(509,200,000)	(173,400,000)
Pension settlement		22,000,000.0	700,000	0
Offer evaluation costs		3,400,000
Chief Executive Officer
Segment Reporting Information [Line Items]
Compensation costs		3,700,000
Bedding Products
Segment Reporting Information [Line Items]
Net trade sales		1,558,400,000	1,751,700,000	1,964,700,000
Long-lived asset impairment				443,700,000
Goodwill impairment			587,900,000
Specialized Products
Segment Reporting Information [Line Items]
Net trade sales		1,122,400,000	1,239,100,000	1,279,800,000
Goodwill impairment			43,600,000
Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Net trade sales		1,374,300,000	1,392,800,000	1,480,800,000
Goodwill impairment			44,500,000
Operating segments
Segment Reporting Information [Line Items]
Net trade sales		4,085,200,000	4,421,700,000	4,770,400,000
Depreciation and amortization		108,100,000	123,700,000	167,500,000
Nonoperating assets depreciation and amortization		14,300,000	12,300,000	12,400,000
Total depreciation and amortization		122,400,000	136,000,000.0	179,900,000
Long-lived asset impairment				443,700,000
Goodwill impairment			676,000,000.0
Restructuring, restructuring-related, and impairment charges		36,200,000	49,800,000
Gain on sale of real estate		(29,100,000)	(30,900,000)	(10,900,000)
Net gain from insurance proceeds		(34,700,000)	(2,200,000)	(8,900,000)
Other segment items		3,699,700,000	4,019,400,000	4,257,200,000
Earnings (loss) before interest and income taxes		381,600,000	(426,400,000)	(90,600,000)
Operating segments \| Aerospace Products Group
Segment Reporting Information [Line Items]
Gain on sale of Aerospace Products Group		(90,900,000)
Operating segments \| Reportable Subsegments
Segment Reporting Information [Line Items]
Net trade sales		4,055,100,000	4,383,600,000	4,725,300,000
Operating segments \| Intersubsegment Eliminations
Segment Reporting Information [Line Items]
Net trade sales		30,100,000	38,100,000	45,100,000
Operating segments \| Bedding Products
Segment Reporting Information [Line Items]
Net trade sales		1,579,400,000	1,776,700,000	1,996,600,000
Depreciation and amortization		55,100,000	59,000,000.0	103,900,000
Nonoperating assets depreciation and amortization		5,500,000	5,000,000.0	5,300,000
Total depreciation and amortization		60,600,000	64,000,000.0	109,200,000
Long-lived asset impairment				443,700,000
Goodwill impairment			587,900,000
Restructuring, restructuring-related, and impairment charges		26,000,000.0	37,400,000
Gain on sale of real estate		(21,700,000)	(30,900,000)	(5,400,000)
Net gain from insurance proceeds		(34,700,000)	0	(1,900,000)
Other segment items		1,450,500,000	1,667,300,000	1,795,200,000
Earnings (loss) before interest and income taxes		98,700,000	(549,000,000.0)	(344,200,000)
Operating segments \| Bedding Products \| Aerospace Products Group
Segment Reporting Information [Line Items]
Gain on sale of Aerospace Products Group		0
Operating segments \| Bedding Products \| Reportable Subsegments
Segment Reporting Information [Line Items]
Net trade sales		1,558,400,000	1,751,700,000	1,964,700,000
Operating segments \| Bedding Products \| Intersubsegment Eliminations
Segment Reporting Information [Line Items]
Net trade sales		21,000,000.0	25,000,000.0	31,900,000
Operating segments \| Specialized Products
Segment Reporting Information [Line Items]
Net trade sales		1,124,000,000	1,242,400,000	1,281,300,000
Depreciation and amortization		34,700,000	43,000,000.0	41,100,000
Nonoperating assets depreciation and amortization		3,900,000	3,400,000	3,300,000
Total depreciation and amortization		38,600,000	46,400,000	44,400,000
Long-lived asset impairment				0
Goodwill impairment			43,600,000
Restructuring, restructuring-related, and impairment charges		7,500,000	10,100,000
Gain on sale of real estate		(1,700,000)	0	0
Net gain from insurance proceeds		0	0	0
Other segment items		966,200,000	1,077,900,000	1,111,900,000
Earnings (loss) before interest and income taxes		204,300,000	64,400,000	125,000,000.0
Operating segments \| Specialized Products \| Aerospace Products Group
Segment Reporting Information [Line Items]
Gain on sale of Aerospace Products Group		(90,900,000)
Operating segments \| Specialized Products \| Reportable Subsegments
Segment Reporting Information [Line Items]
Net trade sales		1,122,400,000	1,239,100,000	1,279,800,000
Operating segments \| Specialized Products \| Intersubsegment Eliminations
Segment Reporting Information [Line Items]
Net trade sales		1,600,000	3,300,000	1,500,000
Operating segments \| Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Net trade sales		1,381,800,000	1,402,600,000	1,492,500,000
Depreciation and amortization		18,300,000	21,700,000	22,500,000
Nonoperating assets depreciation and amortization		4,900,000	3,900,000	3,800,000
Total depreciation and amortization		23,200,000	25,600,000	26,300,000
Long-lived asset impairment				0
Goodwill impairment			44,500,000
Restructuring, restructuring-related, and impairment charges		2,700,000	2,300,000
Gain on sale of real estate		(5,700,000)	0	(5,500,000)
Net gain from insurance proceeds		0	(2,200,000)	(7,000,000.0)
Other segment items		1,283,000,000	1,274,200,000	1,350,100,000
Earnings (loss) before interest and income taxes		78,600,000	58,200,000	128,600,000
Operating segments \| Furniture, Flooring & Textile Products \| Aerospace Products Group
Segment Reporting Information [Line Items]
Gain on sale of Aerospace Products Group		0
Operating segments \| Furniture, Flooring & Textile Products \| Reportable Subsegments
Segment Reporting Information [Line Items]
Net trade sales		1,374,300,000	1,392,800,000	1,480,800,000
Operating segments \| Furniture, Flooring & Textile Products \| Intersubsegment Eliminations
Segment Reporting Information [Line Items]
Net trade sales		7,500,000	9,800,000	11,700,000
Intersegment eliminations
Segment Reporting Information [Line Items]
Earnings (loss) before interest and income taxes		$ (25,600,000)	$ (3,500,000)	$ 200,000

LEGGETT & PLATT INC 10-K