Average Assets for Segments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Assets	$ 3,427.9		$ 3,254.9
Residential Furnishings
Segment Reporting Information [Line Items]
Assets	576.1		602.9
Commercial Fixturing & Components
Segment Reporting Information [Line Items]
Assets	144.9		159.1
Industrial Materials
Segment Reporting Information [Line Items]
Assets	248.9		243.3
Specialized Products
Segment Reporting Information [Line Items]
Assets	219.7		227.4
Average current liabilities included in segment numbers above
Segment Reporting Information [Line Items]
Assets	440.7		440.7
Unallocated assets
Segment Reporting Information [Line Items]
Assets	1,758.1	[1]	1,678.2	[1]
Difference between average assets and period-end balance sheet
Segment Reporting Information [Line Items]
Assets	$ 39.5		$ (96.7)

[1] Primarily goodwill, other intangibles, cash and deferred tax assets