Segment Information (Average Assets For Segments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Assets	$ 5,307.3	$ 4,800.0	$ 4,855.4
Additions to Property, Plant and Equipment	106.6	66.2	143.1
Acquired Companies’ Long-Lived Assets	167.9	0.0	1,297.4
Operating segments | Bedding Products
Segment Reporting Information [Line Items]
Assets	836.0	739.0	829.6
Additions to Property, Plant and Equipment	67.1	27.1	65.4
Acquired Companies’ Long-Lived Assets	136.6	0.0	1,279.8
Operating segments | Specialized Products
Segment Reporting Information [Line Items]
Assets	316.7	299.5	346.4
Additions to Property, Plant and Equipment	20.6	13.2	29.3
Acquired Companies’ Long-Lived Assets	25.1	0.0	0.2
Operating segments | Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Assets	373.5	348.6	383.2
Additions to Property, Plant and Equipment	9.8	7.9	13.7
Acquired Companies’ Long-Lived Assets	6.2	0.0	17.4
Average current liabilities included in segment numbers above
Segment Reporting Information [Line Items]
Assets	814.1	665.0	735.3
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	2,828.5	2,759.1	2,689.7
Additions to Property, Plant and Equipment	9.1	18.0	34.7
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	138.5	(11.2)	(128.8)
Additions to Property, Plant and Equipment	0.0	0.0	0.0
Acquired Companies’ Long-Lived Assets	$ 0.0	$ 0.0	$ 0.0