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Impairment Charges (Schedule of Impairment Charges) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Asset Impairment Charges [Line Items]        
Goodwill Impairment $ 675,300,000 $ 676,000,000.0 $ 0 $ 0
Long-lived asset impairment   6,300,000 443,700,000 0
Total Impairments   682,300,000 443,700,000 $ 0
Total restructuring-related costs   50,700,000    
2024 Restructuring Plan        
Schedule Of Asset Impairment Charges [Line Items]        
Goodwill Impairment   700,000    
Long-lived asset impairment   3,500,000    
2024 Restructuring Plan        
Schedule Of Asset Impairment Charges [Line Items]        
Total restructuring-related costs   47,800,000    
2024 Restructuring Plan | Impairment costs associated with this plan        
Schedule Of Asset Impairment Charges [Line Items]        
Total restructuring-related costs   4,200,000    
Bedding Products        
Schedule Of Asset Impairment Charges [Line Items]        
Goodwill Impairment   587,900,000 0  
Long-lived asset impairment   4,600,000 443,700,000  
Total Impairments   592,500,000 443,700,000  
Specialized Products        
Schedule Of Asset Impairment Charges [Line Items]        
Goodwill Impairment   43,600,000 0  
Long-lived asset impairment   800,000 0  
Total Impairments   44,400,000 0  
Furniture, Flooring & Textile Products        
Schedule Of Asset Impairment Charges [Line Items]        
Goodwill Impairment   44,500,000 0  
Long-lived asset impairment   900,000 0  
Total Impairments   $ 45,400,000 $ 0