Goodwill and Other Intangible Assets (Changes In The Carrying Amounts Of Goodwill) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Goodwill [Roll Forward]
Net goodwill, beginning of period	$ 1,388,800,000	$ 1,406,300,000
Adjustments to prior year acquisitions		600,000
Additions for current year acquisitions	70,900,000
Reductions for sale of business	(1,300,000)	(2,500,000)
Goodwill impairment	0	(25,400,000)	$ 0
Foreign currency translation adjustment	(8,800,000)	9,800,000
Net goodwill, end of period	1,449,600,000	1,388,800,000	1,406,300,000
Gross goodwill	1,797,700,000
Accumulated impairment losses	(348,100,000)
Goodwill	1,449,600,000	1,388,800,000	1,406,300,000
Bedding Products
Goodwill [Roll Forward]
Net goodwill, beginning of period	856,900,000	855,900,000
Adjustments to prior year acquisitions		0
Additions for current year acquisitions	58,300,000
Reductions for sale of business	(1,300,000)	(2,500,000)
Goodwill impairment		0
Foreign currency translation adjustment	(5,600,000)	3,500,000
Net goodwill, end of period	908,300,000	856,900,000	855,900,000
Gross goodwill	913,700,000
Accumulated impairment losses	(5,400,000)
Goodwill	908,300,000	856,900,000	855,900,000
Specialized Products
Goodwill [Roll Forward]
Net goodwill, beginning of period	187,000,000.0	208,800,000
Adjustments to prior year acquisitions		0
Additions for current year acquisitions	8,200,000
Reductions for sale of business	0	0
Goodwill impairment		(25,400,000)
Foreign currency translation adjustment	(2,500,000)	3,600,000
Net goodwill, end of period	192,700,000	187,000,000.0	208,800,000
Gross goodwill	284,800,000
Accumulated impairment losses	(92,100,000)
Goodwill	192,700,000	187,000,000.0	208,800,000
Furniture, Flooring & Textile Products
Goodwill [Roll Forward]
Net goodwill, beginning of period	344,900,000	341,600,000
Adjustments to prior year acquisitions		600,000
Additions for current year acquisitions	4,400,000
Reductions for sale of business	0	0
Goodwill impairment		0
Foreign currency translation adjustment	(700,000)	2,700,000
Net goodwill, end of period	348,600,000	344,900,000	341,600,000
Gross goodwill	599,200,000
Accumulated impairment losses	(250,600,000)
Goodwill	$ 348,600,000	$ 344,900,000	$ 341,600,000