SEGMENT INFORMATION - Average Assets for Segments (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 5,144.3	$ 5,186.1
Operating segments | Bedding Products
Segment Reporting Information [Line Items]
Total assets	828.0	931.2
Operating segments | Specialized Products
Segment Reporting Information [Line Items]
Total assets	398.2	350.1
Operating segments | Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Total assets	409.1	423.1
Average current liabilities included in segment numbers above
Segment Reporting Information [Line Items]
Total assets	725.5	793.9
Unallocated assets
Segment Reporting Information [Line Items]
Total assets	2,779.9	2,840.6
Difference between average assets and period-end balance sheet
Segment Reporting Information [Line Items]
Total assets	$ 3.6	$ (152.8)