SEGMENT INFORMATION - Average Assets for Segments (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Assets	$ 3,644.0	$ 3,551.5	$ 3,550.8
Operating segments | Residential Products
Segment Reporting Information [Line Items]
Assets	597.8		554.6
Operating segments | Industrial Products
Segment Reporting Information [Line Items]
Assets	162.3		150.0
Operating segments | Furniture Products
Segment Reporting Information [Line Items]
Assets	271.5		245.7
Operating segments | Specialized Products
Segment Reporting Information [Line Items]
Assets	335.9		271.7
Operating segments | Average current liabilities included in segment numbers above
Segment Reporting Information [Line Items]
Assets	626.2		557.0
Unallocated assets
Segment Reporting Information [Line Items]
Assets	1,570.7		1,693.1
Difference between average assets and period-end balance sheet
Segment Reporting Information [Line Items]
Assets	$ 79.6		$ 78.7