Average Assets for Segments (Detail) - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Assets		$ 3,031.8	$ 2,963.7
Operating Segments | Residential Furnishings
Segment Reporting Information [Line Items]
Assets		602.2	623.7
Operating Segments | Commercial Products
Segment Reporting Information [Line Items]
Assets		121.6	110.2
Operating Segments | Industrial Materials
Segment Reporting Information [Line Items]
Assets		151.0	186.7
Operating Segments | Specialized Products
Segment Reporting Information [Line Items]
Assets		266.9	256.4
Operating Segments | Other units
Segment Reporting Information [Line Items]
Assets	[1]	0.4	6.3
Operating Segments | Average current liabilities included in segment numbers above
Segment Reporting Information [Line Items]
Assets		488.0	516.6
Unallocated assets
Segment Reporting Information [Line Items]
Assets	[2]	1,381.7	1,387.0
Difference between average assets and period-end balance sheet
Segment Reporting Information [Line Items]
Assets		$ 20.0	$ (123.2)

[1] Businesses sold or classified as discontinued operations

[2] Unallocated assets consist primarily of goodwill, other intangibles, cash and deferred tax assets.