REVENUE - By Major Source (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Net trade sales	$ 1,207.6	$ 1,239.3	$ 3,098.2	$ 3,607.6
Bedding Products | Bedding group
Disaggregation of Revenue [Line Items]
Net trade sales	589.8	601.4	1,491.0	1,724.1
Specialized Products
Disaggregation of Revenue [Line Items]
Net trade sales	242.9	267.2	618.2	797.1
Specialized Products | Automotive group
Disaggregation of Revenue [Line Items]
Net trade sales	207.9	209.6	487.1	607.6
Specialized Products | Aerospace Products group
Disaggregation of Revenue [Line Items]
Net trade sales	19.6	36.2	79.8	116.3
Specialized Products | Hydraulic Cylinders group
Disaggregation of Revenue [Line Items]
Net trade sales	15.4	21.4	51.3	73.2
Furniture, Flooring & Textile Products
Disaggregation of Revenue [Line Items]
Net trade sales	374.9	370.7	989.0	1,086.4
Furniture, Flooring & Textile Products | Home Furniture group
Disaggregation of Revenue [Line Items]
Net trade sales	89.6	86.3	220.6	264.6
Furniture, Flooring & Textile Products | Work Furniture group
Disaggregation of Revenue [Line Items]
Net trade sales	59.3	77.1	168.3	224.8
Furniture, Flooring & Textile Products | Flooring & Textile Products group
Disaggregation of Revenue [Line Items]
Net trade sales	$ 226.0	$ 207.3	$ 600.1	$ 597.0