SEGMENT INFORMATION - Average Assets for Segments (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 5,270.0	$ 5,186.1
Operating segments | Bedding Products
Segment Reporting Information [Line Items]
Total assets	833.6	931.2
Operating segments | Specialized Products
Segment Reporting Information [Line Items]
Total assets	396.2	350.1
Operating segments | Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Total assets	409.0	423.1
Unallocated assets
Segment Reporting Information [Line Items]
Total assets	718.0	793.9
Difference between average assets and period-end balance sheet
Segment Reporting Information [Line Items]
Total assets	14.5	(152.8)
Eliminations And Reconciling Items
Segment Reporting Information [Line Items]
Total assets	$ 2,898.7	$ 2,840.6