Average Assets for Segments (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Assets	$ 3,281.5	$ 2,984.1
Operating Segments | Residential Products
Segment Reporting Information [Line Items]
Assets	542.4	527.2
Operating Segments | Industrial Materials
Segment Reporting Information [Line Items]
Assets	144.2	147.4
Operating Segments | Furniture Products
Segment Reporting Information [Line Items]
Assets	234.5	219.4
Operating Segments | Specialized Products
Segment Reporting Information [Line Items]
Assets	269.7	248.7
Operating Segments | Other units
Segment Reporting Information [Line Items]
Assets	0.0	0.2
Operating Segments | Average current liabilities included in segment numbers above
Segment Reporting Information [Line Items]
Assets	534.9	495.9
Difference between average assets and period-end balance sheet
Segment Reporting Information [Line Items]
Assets	94.6	(33.0)
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Assets	$ 1,461.2	$ 1,378.3