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Restructuring and Related Activities - Schedule of Restructuring-Related Costs by Segment (Details) - 2024 restructuring plan - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended 21 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Sep. 30, 2025
Restructuring Cost and Reserve [Line Items]            
Total restructuring-related costs     $ 10.6   $ 47.8 $ 58.4
Other restructuring            
Restructuring Cost and Reserve [Line Items]            
Total restructuring-related costs $ 1.0 $ 11.7 8.6 $ 31.1 $ 43.6 $ 52.2
Other restructuring | Bedding Products            
Restructuring Cost and Reserve [Line Items]            
Total restructuring-related costs 0.3 7.4 4.6 24.0    
Other restructuring | Specialized Products            
Restructuring Cost and Reserve [Line Items]            
Total restructuring-related costs 0.6 3.8 2.9 5.1    
Other restructuring | Furniture, Flooring & Textile Products            
Restructuring Cost and Reserve [Line Items]            
Total restructuring-related costs $ 0.1 $ 0.5 $ 1.1 $ 2.0