SEGMENT INFORMATION - Summary of Segment Results from Continuing Operations (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	3
Net trade sales	$ 1,322.3	$ 1,150.9
Total Sales	1,339.5	1,165.4
EBIT	137.6	127.7
Depreciation and Amortization	45.7	46.1
Bedding Products
Segment Reporting Information [Line Items]
Total Sales	651.4	545.8
EBIT	76.2	63.8
Depreciation and Amortization	26.2	26.1
Specialized Products
Segment Reporting Information [Line Items]
Net trade sales	264.1	257.6
Total Sales	265.0	258.5
EBIT	20.3	35.2
Depreciation and Amortization	10.8	11.1
Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Net trade sales	418.8	357.5
Total Sales	423.1	361.1
EBIT	42.7	28.3
Depreciation and Amortization	5.9	6.1
Operating segments
Segment Reporting Information [Line Items]
Net trade sales	1,322.3	1,150.9
Operating segments | Bedding Products
Segment Reporting Information [Line Items]
Net trade sales	639.4	535.8
Operating segments | Specialized Products
Segment Reporting Information [Line Items]
Net trade sales	264.1	257.6
Operating segments | Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Net trade sales	418.8	357.5
Intersegment eliminations
Segment Reporting Information [Line Items]
Net trade sales	17.2	14.5
EBIT	(1.6)	0.4
Depreciation and Amortization	2.8	2.8
Intersegment eliminations | Bedding Products
Segment Reporting Information [Line Items]
Net trade sales	12.0	10.0
Intersegment eliminations | Specialized Products
Segment Reporting Information [Line Items]
Net trade sales	0.9	0.9
Intersegment eliminations | Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Net trade sales	$ 4.3	$ 3.6