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Segment Information - Summary of Average Assets for Segments (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total assets	$ 3,780.1	$ 3,780.1		$ 4,634.5
Goodwill impairment	0.0	675.3	$ 0.0
Bedding Products
Segment Reporting Information [Line Items]
Goodwill impairment	0.0	587.2
Specialized Products
Segment Reporting Information [Line Items]
Goodwill impairment	0.0	43.6
Operating segments | Bedding Products
Segment Reporting Information [Line Items]
Total assets	755.8	755.8		815.2
Operating segments | Specialized Products
Segment Reporting Information [Line Items]
Total assets	399.4	399.4		398.6
Operating segments | Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Total assets	354.4	354.4		390.3
Average current liabilities included in segment numbers above
Segment Reporting Information [Line Items]
Total assets	688.3	688.3		736.1
Unallocated assets
Segment Reporting Information [Line Items]
Total assets	1,608.6	1,608.6		2,403.2
Difference between average assets and period-end balance sheet
Segment Reporting Information [Line Items]
Total assets	$ (26.4)	$ (26.4)		$ (108.9)

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