Impairment Charges - Schedule of Impairment Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Schedule Of Asset Impairment Charges [Line Items]
Other Long-Lived Assets Impairment	$ 0.9	$ 0.3	$ 1.2	$ 2.6
Goodwill impairment (Note F)		675.3	0.0	675.3
Total Impairments	0.9	675.6	1.2	677.9
Bedding Products
Schedule Of Asset Impairment Charges [Line Items]
Other Long-Lived Assets Impairment	0.9	0.3	1.2	2.6
Goodwill impairment (Note F)		587.2		587.2	$ 0.7
Total Impairments		587.5		589.8
Specialized Products
Schedule Of Asset Impairment Charges [Line Items]
Other Long-Lived Assets Impairment	0.0	0.0	0.0	0.0
Goodwill impairment (Note F)		43.6		43.6
Total Impairments		43.6		43.6
Furniture, Flooring & Textile Products
Schedule Of Asset Impairment Charges [Line Items]
Other Long-Lived Assets Impairment	$ 0.0	0.0	$ 0.0	0.0
Goodwill impairment (Note F)		44.5		44.5
Total Impairments		$ 44.5		$ 44.5

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.