Segment Information (Segment Results From Continuing Operations) (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment									3
Segment Reporting Information [Line Items]
Trade sales	$ 1,332,900,000	$ 1,319,200,000	$ 1,269,600,000	$ 1,150,900,000	$ 1,182,000,000	$ 1,207,600,000	$ 845,100,000	$ 1,045,500,000	$ 5,072,600,000	$ 4,280,200,000	$ 4,752,500,000
Total Segment Sales									5,133,700,000	4,329,000,000	4,813,000,000
EBIT									596,000,000.0	407,500,000	486,800,000
Depreciation and Amortization									187,300,000	189,400,000	191,900,000
Goodwill impairment									0	25,400,000	0
Hydraulic Cylinders
Segment Reporting Information [Line Items]
Goodwill impairment							$ 25,400,000			25,400,000
Bedding Products
Segment Reporting Information [Line Items]
Trade sales									2,455,900,000	2,039,300,000	2,254,300,000
Total Segment Sales									2,500,000,000	2,071,500,000	2,295,600,000
EBIT									321,300,000	192,400,000	214,900,000
Depreciation and Amortization									106,800,000	106,700,000	107,300,000
Gain on the sale of real estate			$ 28,200,000
Goodwill impairment										0
Specialized Products
Segment Reporting Information [Line Items]
Trade sales									998,900,000	891,200,000	1,066,800,000
Total Segment Sales									1,002,500,000	894,000,000.0	1,070,000,000
EBIT									115,900,000	92,000,000.0	169,900,000
Depreciation and Amortization									44,800,000	44,300,000	41,800,000
Goodwill impairment										25,400,000
Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Trade sales									1,617,800,000	1,349,700,000	1,431,400,000
Total Segment Sales									1,631,200,000	1,363,500,000	1,447,400,000
EBIT									159,500,000	126,500,000	102,300,000
Depreciation and Amortization									24,000,000.0	25,500,000	25,700,000
Goodwill impairment										0
Intersegment eliminations
Segment Reporting Information [Line Items]
Trade sales									(61,100,000)	(48,800,000)	(60,500,000)
Intersegment eliminations | Bedding Products
Segment Reporting Information [Line Items]
Trade sales									(44,100,000)	(32,200,000)	(41,300,000)
Intersegment eliminations | Specialized Products
Segment Reporting Information [Line Items]
Trade sales									(3,600,000)	(2,800,000)	(3,200,000)
Intersegment eliminations | Furniture, Flooring & Textile Products
Segment Reporting Information [Line Items]
Trade sales									(13,400,000)	(13,800,000)	(16,000,000.0)
Intersegment eliminations and other
Segment Reporting Information [Line Items]
Intersegment eliminations and other									(700,000)	(3,400,000)	(300,000)
Depreciation and Amortization									$ 11,700,000	$ 12,900,000	$ 17,100,000