Restructuring and Related Activities - Schedule of Restructuring-Related Costs by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended		30 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2024	Jun. 30, 2026
Restructuring Cost and Reserve [Line Items]
Total incurred cost	$ 10.1	$ 2.2	$ 12.2	$ 8.8
2024 restructuring plan
Restructuring Cost and Reserve [Line Items]
Total incurred cost			3.6		$ 29.7	$ 47.8	$ 81.1
2026 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Total incurred cost	9.5		11.4
Other restructuring \| 2024 restructuring plan
Restructuring Cost and Reserve [Line Items]
Total incurred cost	0.6	2.4	0.8	7.6	$ 10.7	$ 43.6	$ 55.1
Other restructuring \| 2026 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Total incurred cost	9.5	0.0	11.4	0.0
Other restructuring \| Bedding Products \| 2024 restructuring plan
Restructuring Cost and Reserve [Line Items]
Total incurred cost	0.1	1.2	0.3	4.3
Other restructuring \| Bedding Products \| 2026 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Total incurred cost	5.8	0.0	7.5	0.0
Other restructuring \| Specialized Products \| 2024 restructuring plan
Restructuring Cost and Reserve [Line Items]
Total incurred cost	0.5	0.3	0.5	2.3
Other restructuring \| Specialized Products \| 2026 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Total incurred cost	2.7	0.0	2.7	0.0
Other restructuring \| Furniture, Flooring & Textile Products \| 2024 restructuring plan
Restructuring Cost and Reserve [Line Items]
Total incurred cost	0.0	0.9	0.0	1.0
Other restructuring \| Furniture, Flooring & Textile Products \| 2026 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Total incurred cost	$ 1.0	$ 0.0	$ 1.2	$ 0.0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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