SEGMENT INFORMATION - Average Assets for Segments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Assets	$ 4,857.8	$ 3,517.9	$ 3,382.0
Operating segments | Residential Products
Segment Reporting Information [Line Items]
Assets	801.3		609.4
Operating segments | Industrial Products
Segment Reporting Information [Line Items]
Assets	170.0		163.8
Operating segments | Furniture Products
Segment Reporting Information [Line Items]
Assets	244.9		279.8
Operating segments | Specialized Products
Segment Reporting Information [Line Items]
Assets	352.7		342.5
Operating segments | Average current liabilities included in segment numbers above
Segment Reporting Information [Line Items]
Assets	746.9		661.8
Unallocated assets
Segment Reporting Information [Line Items]
Assets	2,597.7		1,278.0
Difference between average assets and period-end balance sheet
Segment Reporting Information [Line Items]
Assets	$ (55.7)		$ 46.7