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SEGMENT INFORMATION - Summary of Average Assets for Segments (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]    
Total assets $ 5,077.6 $ 5,186.1
Operating segments | Bedding Products    
Segment Reporting Information [Line Items]    
Total assets 820.9 931.2
Operating segments | Specialized Products    
Segment Reporting Information [Line Items]    
Total assets 399.2 350.1
Operating segments | Furniture, Flooring & Textile Products    
Segment Reporting Information [Line Items]    
Total assets 401.7 423.1
Average current liabilities included in segment numbers above    
Segment Reporting Information [Line Items]    
Total assets 733.8 793.9
Unallocated assets    
Segment Reporting Information [Line Items]    
Total assets 2,758.5 2,840.6
Difference between average assets and period-end balance sheet    
Segment Reporting Information [Line Items]    
Total assets $ (36.5) $ (152.8)