Goodwill and Other Intangible Assets - Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Goodwill [Line Items]
Goodwill	$ 307.6	[1]	$ 307.6	[1]	$ 294.1	[1]
Amortization of intangible assets	44.3		44.8		37.0
Intangible assets, less accumulated amortization	614.9		659.2
TECH [Member]
Goodwill [Line Items]
Weighted average percent for DCF approach	50.00%
Weighted average percent for EBITDA approach	50.00%
Weighted average cost of capital	16.90%
Goodwill	19.4	[1]	19.4	[1]	7.3	[1]
Ergotron, Inc [Member]
Goodwill [Line Items]
Goodwill			$ 131.4		$ 130.0
Minimum [Member] | TECH [Member]
Goodwill [Line Items]
EBITDA multiple	7.5
Maximum [Member] | TECH [Member]
Goodwill [Line Items]
EBITDA multiple	8.5

[1] The Residential Heating and Cooling ("RHC") and Custom & Engineered Solutions ("CES") reporting units did not have goodwill in any period presented.