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Segment Information - Schedule of Average Assets for Segments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Segment Reporting Information [Line Items]    
Total assets $ 3,525.0 $ 3,661.6
Operating segments | Bedding Products    
Segment Reporting Information [Line Items]    
Total assets 649.1 741.8
Operating segments | Specialized Products    
Segment Reporting Information [Line Items]    
Total assets 383.7 398.7
Operating segments | Furniture, Flooring & Textile Products    
Segment Reporting Information [Line Items]    
Total assets 336.8 346.1
Average current liabilities included in segment numbers above    
Segment Reporting Information [Line Items]    
Average current liabilities included in segment numbers above 659.0 692.7
Unallocated assets    
Segment Reporting Information [Line Items]    
Total assets 1,621.0 1,634.0
Difference between average assets and period-end balance sheet    
Segment Reporting Information [Line Items]    
Total assets $ (124.6) $ (151.7)