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Impairment Charges - Schedule of Impairment Charges (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Schedule Of Asset Impairment Charges [Line Items]            
Other Long-Lived Assets Impairment $ 0.8 $ 0.6   $ 2.0 $ 3.2  
Goodwill impairment   0.0 $ 675.3 0.0 675.3  
Total Impairments 0.8 0.6   2.0 678.5  
Bedding Products            
Schedule Of Asset Impairment Charges [Line Items]            
Other Long-Lived Assets Impairment $ 0.8 0.6   2.0 3.2  
Goodwill impairment   0.0     587.2 $ 0.7
Total Impairments   $ 0.6     590.4  
Specialized Products            
Schedule Of Asset Impairment Charges [Line Items]            
Other Long-Lived Assets Impairment       0.0 0.0  
Goodwill impairment         43.6  
Total Impairments         43.6  
Furniture, Flooring & Textile Products            
Schedule Of Asset Impairment Charges [Line Items]            
Other Long-Lived Assets Impairment       $ 0.0 0.0  
Goodwill impairment         44.5  
Total Impairments         $ 44.5