REVENUE - By Major Source (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Net trade sales	$ 845.1	$ 1,213.2	$ 1,890.6	$ 2,368.3
Bedding Products
Disaggregation of Revenue [Line Items]
Net trade sales	410.6	568.4	901.2	1,122.7
Bedding Products | Bedding group
Disaggregation of Revenue [Line Items]
Net trade sales	410.6	568.4	901.2	1,122.7
Specialized Products
Disaggregation of Revenue [Line Items]
Net trade sales	140.8	267.0	375.3	529.9
Specialized Products | Automotive group
Disaggregation of Revenue [Line Items]
Net trade sales	105.5	201.9	279.2	398.0
Specialized Products | Aerospace Products group
Disaggregation of Revenue [Line Items]
Net trade sales	21.8	40.7	60.2	80.1
Specialized Products | Hydraulic Cylinders group
Disaggregation of Revenue [Line Items]
Net trade sales	13.5	24.4	35.9	51.8
Furniture, Flooring & Textile Products
Disaggregation of Revenue [Line Items]
Net trade sales	293.7	377.8	614.1	715.7
Furniture, Flooring & Textile Products | Home Furniture group
Disaggregation of Revenue [Line Items]
Net trade sales	49.8	87.4	131.0	178.3
Furniture, Flooring & Textile Products | Work Furniture group
Disaggregation of Revenue [Line Items]
Net trade sales	45.4	74.5	109.0	147.7
Furniture, Flooring & Textile Products | Flooring & Textile Products group
Disaggregation of Revenue [Line Items]
Net trade sales	$ 198.5	$ 215.9	$ 374.1	$ 389.7