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Segment Information (Average Assets For Segments) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]        
Assets   $ 3,661.6 $ 4,634.5 $ 5,186.1
Additions to Property, Plant and Equipment   81.6 113.8 100.3
Acquired Companies’ Long-Lived Assets   0.0 0.0 100.9
Goodwill impairment $ 675.3 676.0 0.0 0.0
Long-lived asset impairment   6.3 443.7 0.0
Bedding Products        
Segment Reporting Information [Line Items]        
Goodwill impairment   587.9 0.0  
Long-lived asset impairment   4.6 443.7  
Specialized Products        
Segment Reporting Information [Line Items]        
Goodwill impairment   43.6 0.0  
Long-lived asset impairment   0.8 0.0  
Furniture, Flooring & Textile Products        
Segment Reporting Information [Line Items]        
Goodwill impairment   44.5    
Operating segments        
Segment Reporting Information [Line Items]        
Goodwill impairment   676.0    
Long-lived asset impairment     443.7  
Operating segments | Bedding Products        
Segment Reporting Information [Line Items]        
Assets   741.8 815.2 931.2
Additions to Property, Plant and Equipment   30.5 47.3 42.1
Acquired Companies’ Long-Lived Assets   0.0 0.0 0.0
Goodwill impairment   587.9    
Long-lived asset impairment     443.7  
Operating segments | Specialized Products        
Segment Reporting Information [Line Items]        
Assets   398.7 398.6 350.1
Additions to Property, Plant and Equipment   35.2 42.7 28.2
Acquired Companies’ Long-Lived Assets   0.0 0.0 93.8
Goodwill impairment   43.6    
Long-lived asset impairment     0.0  
Operating segments | Furniture, Flooring & Textile Products        
Segment Reporting Information [Line Items]        
Assets   346.1 390.3 423.1
Additions to Property, Plant and Equipment   9.7 12.7 12.5
Acquired Companies’ Long-Lived Assets   0.0 0.0 7.1
Goodwill impairment   44.5    
Long-lived asset impairment     0.0  
Average current liabilities included in segment numbers above        
Segment Reporting Information [Line Items]        
Assets   692.7 736.1 793.9
Additions to Property, Plant and Equipment   0.0 0.0 0.0
Acquired Companies’ Long-Lived Assets   0.0 0.0 0.0
Unallocated assets and other        
Segment Reporting Information [Line Items]        
Assets   1,634.0 2,403.2 2,840.6
Additions to Property, Plant and Equipment   6.2 11.1 17.5
Acquired Companies’ Long-Lived Assets   0.0 0.0 0.0
Difference between average assets and year-end balance sheet        
Segment Reporting Information [Line Items]        
Assets   (151.7) (108.9) (152.8)
Additions to Property, Plant and Equipment   0.0 0.0 0.0
Acquired Companies’ Long-Lived Assets   $ 0.0 $ 0.0 $ 0.0