SEGMENT INFORMATION - Average Assets for Segments (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Assets	$ 5,002.0	$ 3,517.9	$ 3,382.0
Operating segments | Residential Products
Segment Reporting Information [Line Items]
Assets	800.4		609.4
Operating segments | Industrial Products
Segment Reporting Information [Line Items]
Assets	169.6		163.8
Operating segments | Furniture Products
Segment Reporting Information [Line Items]
Assets	253.9		279.8
Operating segments | Specialized Products
Segment Reporting Information [Line Items]
Assets	358.9		342.5
Operating segments | Average current liabilities included in segment numbers above
Segment Reporting Information [Line Items]
Assets	756.3		661.8
Unallocated assets
Segment Reporting Information [Line Items]
Assets	2,691.2		1,278.0
Difference between average assets and period-end balance sheet
Segment Reporting Information [Line Items]
Assets	$ (28.3)		$ 46.7