REVENUE - By Major Source (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Net trade sales	$ 1,319.2	$ 1,207.6	$ 3,739.7	$ 3,098.2
Bedding Products | Bedding Group
Disaggregation of Revenue [Line Items]
Net trade sales	664.1	589.8	1,808.6	1,491.0
Specialized Products
Disaggregation of Revenue [Line Items]
Net trade sales	235.6	242.9	734.9	618.2
Specialized Products | Automotive Group
Disaggregation of Revenue [Line Items]
Net trade sales	187.6	207.9	591.0	487.1
Specialized Products | Aerospace Products Group
Disaggregation of Revenue [Line Items]
Net trade sales	25.0	19.6	74.9	79.8
Specialized Products | Hydraulic Cylinders Group
Disaggregation of Revenue [Line Items]
Net trade sales	23.0	15.4	69.0	51.3
Furniture, Flooring & Textile Products
Disaggregation of Revenue [Line Items]
Net trade sales	419.5	374.9	1,196.2	989.0
Furniture, Flooring & Textile Products | Home Furniture Group
Disaggregation of Revenue [Line Items]
Net trade sales	110.6	89.6	309.5	220.6
Furniture, Flooring & Textile Products | Work Furniture Group
Disaggregation of Revenue [Line Items]
Net trade sales	72.7	59.3	205.3	168.3
Furniture, Flooring & Textile Products | Flooring & Textile Products Group
Disaggregation of Revenue [Line Items]
Net trade sales	$ 236.2	$ 226.0	$ 681.4	$ 600.1