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Average Assets for Segments (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]    
Assets $ 3,066.2 $ 3,140.6
Residential Furnishings    
Segment Reporting Information [Line Items]    
Assets 635.9 588.1
Commercial Products    
Segment Reporting Information [Line Items]    
Assets 106.7 96.2
Industrial Materials    
Segment Reporting Information [Line Items]    
Assets 185.7 200.9
Specialized Products    
Segment Reporting Information [Line Items]    
Assets 259.1 261.2
Industrial Materials - Steel Tubing    
Segment Reporting Information [Line Items]    
Assets [1] 7.2 68.0
Average current liabilities included in segment numbers above    
Segment Reporting Information [Line Items]    
Assets 524.5 520.8
Unallocated assets    
Segment Reporting Information [Line Items]    
Assets [2] 1,369.6 1,470.4
Difference between average assets and period-end balance sheet    
Segment Reporting Information [Line Items]    
Assets $ (22.5) $ (65.0)
[1] Businesses sold or classified as discontinued operations
[2] Unallocated assets consist primarily of goodwill, other intangibles, cash and deferred tax assets.