Segment Information (Average Assets For Segments) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Assets		$ 2,967.6	$ 3,140.6	$ 3,108.1
Additions to Property, Plant and Equipment		103.2	94.1	80.6
Acquired Companies’ Long-Lived Assets		25.6	60.8	34.9
Depreciation And Amortization		113.2	117.9	122.6
Residential Furnishings
Segment Reporting Information [Line Items]
Assets		623.7	586.4	575.3
Additions to Property, Plant and Equipment		44.8	48.8	36.9
Acquired Companies’ Long-Lived Assets		0.2	60.8	3.9
Depreciation And Amortization		48.9	48.5	46.7
Commercial Fixturing & Components
Segment Reporting Information [Line Items]
Assets		110.2	96.2	98.6
Additions to Property, Plant and Equipment		4.6	3.2	2.7
Acquired Companies’ Long-Lived Assets		25.4	0.0	0.0
Depreciation And Amortization		5.7	5.8	6.5
Industrial Materials - Steel Tubing
Segment Reporting Information [Line Items]
Assets		186.7	202.6	209.6
Additions to Property, Plant and Equipment		12.5	13.6	11.8
Acquired Companies’ Long-Lived Assets		0.0	0.0	0.1
Depreciation And Amortization		14.2	14.0	14.1
Specialized Products:
Segment Reporting Information [Line Items]
Assets		256.4	261.2	224.5
Additions to Property, Plant and Equipment		31.7	25.5	25.9
Acquired Companies’ Long-Lived Assets		0.0	0.0	30.9
Depreciation And Amortization		29.8	30.7	33.1
Average current liabilities included in segment numbers above
Segment Reporting Information [Line Items]
Assets		516.6	520.8	461.7
Additions to Property, Plant and Equipment		0.0	0.0	0.0
Acquired Companies’ Long-Lived Assets		0.0	0.0	0.0
Depreciation And Amortization		0.0	0.0	0.0
Other
Segment Reporting Information [Line Items]
Assets	[1]	6.3	68.0	99.6
Additions to Property, Plant and Equipment	[1]	0.0	1.4	1.1
Acquired Companies’ Long-Lived Assets	[1]	0.0	0.0	0.0
Depreciation And Amortization	[1]	0.1	2.9	6.1
Unallocated assets
Segment Reporting Information [Line Items]
Assets	[2]	1,390.9	1,470.4	1,492.0
Additions to Property, Plant and Equipment	[2]	9.6	1.6	2.2
Acquired Companies’ Long-Lived Assets	[2]	0.0	0.0	0.0
Depreciation And Amortization	[2]	14.5	16.0	16.1
Difference between average assets and year-end balance sheet
Segment Reporting Information [Line Items]
Assets		(123.2)	(65.0)	(53.2)
Additions to Property, Plant and Equipment		0.0	0.0	0.0
Acquired Companies’ Long-Lived Assets		0.0	0.0	0.0
Depreciation And Amortization		$ 0.0	$ 0.0	$ 0.0

[1] Businesses sold or classified as discontinued operations during the years presented.

[2] Unallocated assets consist primarily of goodwill, other intangibles, cash and deferred tax assets. Unallocated depreciation and amortization consists primarily of depreciation of non-operating assets and amortization of debt issue costs.