SEGMENT INFORMATION - Summary of Segment Results from Continuing Operations (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)
Segment Reporting [Abstract]
Number of operating segments \| segment			3
Segment Reporting Information [Line Items]
Net trade sales	$ 1,175.4	$ 1,294.4	$ 3,610.2	$ 3,950.9
EBIT	91.4	113.2	276.4	393.8
Depreciation and Amortization	45.0	44.1	135.1	134.3
Bedding Products
Segment Reporting Information [Line Items]
Net trade sales	483.3	582.0	1,516.2	1,833.9
Specialized Products
Segment Reporting Information [Line Items]
Net trade sales	319.4	291.3	961.3	815.5
Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Net trade sales	372.7	421.1	1,132.7	1,301.5
Trade sales
Segment Reporting Information [Line Items]
Net trade sales	1,185.9	1,307.5	3,646.2	3,996.8
Trade sales \| Bedding Products
Segment Reporting Information [Line Items]
Net trade sales	490.7	590.8	1,541.7	1,866.1
EBIT	31.1	43.9	87.4	189.2
Depreciation and Amortization	26.2	25.7	77.3	78.1
Trade sales \| Specialized Products
Segment Reporting Information [Line Items]
Net trade sales	319.7	291.8	962.5	817.3
EBIT	31.2	31.3	93.0	73.0
Depreciation and Amortization	10.7	9.7	31.7	30.4
Trade sales \| Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Net trade sales	375.5	424.9	1,142.0	1,313.4
EBIT	29.5	38.3	96.7	132.3
Depreciation and Amortization	5.5	5.7	17.0	17.5
Intersegment eliminations
Segment Reporting Information [Line Items]
Net trade sales	10.5	13.1	36.0	45.9
EBIT	(0.4)	(0.3)	(0.7)	(0.7)
Depreciation and Amortization	2.6	3.0	9.1	8.3
Intersegment eliminations \| Bedding Products
Segment Reporting Information [Line Items]
Net trade sales	7.4	8.8	25.5	32.2
Intersegment eliminations \| Specialized Products
Segment Reporting Information [Line Items]
Net trade sales	0.3	0.5	1.2	1.8
Intersegment eliminations \| Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Net trade sales	$ 2.8	$ 3.8	$ 9.3	$ 11.9

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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