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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

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