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Segment Information (Average Assets For Segments) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Assets $ 4,634,500,000 $ 5,186,100,000 $ 5,307,300,000
Additions to Property, Plant and Equipment 113,800,000 100,300,000 106,600,000
Acquired Companies’ Long-Lived Assets 0 100,900,000 167,900,000
Long-lived asset impairment 443,700,000 0 0
Operating segments | Bedding Products      
Segment Reporting Information [Line Items]      
Assets 815,200,000 931,200,000 836,000,000.0
Additions to Property, Plant and Equipment 47,300,000 42,100,000 67,100,000
Acquired Companies’ Long-Lived Assets 0 0 136,600,000
Operating segments | Specialized Products      
Segment Reporting Information [Line Items]      
Assets 398,600,000 350,100,000 316,700,000
Additions to Property, Plant and Equipment 42,700,000 28,200,000 20,600,000
Acquired Companies’ Long-Lived Assets 0 93,800,000 25,100,000
Operating segments | Furniture, Flooring & Textile Products      
Segment Reporting Information [Line Items]      
Assets 390,300,000 423,100,000 373,500,000
Additions to Property, Plant and Equipment 12,700,000 12,500,000 9,800,000
Acquired Companies’ Long-Lived Assets 0 7,100,000 6,200,000
Average current liabilities included in segment numbers above      
Segment Reporting Information [Line Items]      
Assets 736,100,000 793,900,000 814,100,000
Additions to Property, Plant and Equipment 0 0 0
Acquired Companies’ Long-Lived Assets 0 0 0
Unallocated assets and other      
Segment Reporting Information [Line Items]      
Assets 2,403,200,000 2,840,600,000 2,828,500,000
Additions to Property, Plant and Equipment 11,100,000 17,500,000 9,100,000
Acquired Companies’ Long-Lived Assets 0 0 0
Difference between average assets and year-end balance sheet      
Segment Reporting Information [Line Items]      
Assets (108,900,000) (152,800,000) 138,500,000
Additions to Property, Plant and Equipment 0 0 0
Acquired Companies’ Long-Lived Assets $ 0 $ 0 $ 0