Average Assets for Segments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Segment Reporting Information [Line Items]
Assets	$ 3,103.2		$ 3,140.6
Residential Furnishings
Segment Reporting Information [Line Items]
Assets	626.3		588.1
Commercial Products
Segment Reporting Information [Line Items]
Assets	97.6		96.2
Industrial Materials
Segment Reporting Information [Line Items]
Assets	188.0		200.9
Specialized Products
Segment Reporting Information [Line Items]
Assets	258.5		260.5
Industrial Materials - Steel Tubing
Segment Reporting Information [Line Items]
Assets	44.8	[1]	90.4	[1]
Average current liabilities included in segment numbers above
Segment Reporting Information [Line Items]
Assets	522.8		520.2
Unallocated assets
Segment Reporting Information [Line Items]
Assets	1,347.1	[2]	1,451.4	[2]
Difference between average assets and period-end balance sheet
Segment Reporting Information [Line Items]
Assets	$ 18.1		$ (67.1)

[1] Businesses sold or classified as discontinued operations.

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