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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