Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Summary of net trade sales and pre-tax operating losses
Gain (loss) on sale	$ 0		$ 0.1		$ 0.2
Service Experts [Member]
Summary of net trade sales and pre-tax operating losses
Net trade sales	385.1	[1]	448.4	[1]	514.8	[1]
Pre-tax operating (loss) income	(50.8)	[1],[2]	(10.5)	[1],[2]	2.6	[1],[2]
Hearth [Member]
Summary of net trade sales and pre-tax operating losses
Net trade sales	23.5		81.5		78.9
Pre-tax operating (loss) income	(13.7)	[3]	(26.3)	[3]	(25.2)	[3]
Gain (loss) on sale	$ (0.9)		$ 0		$ 0

[1] Excludes eliminations of intercompany sales and any associated profit.

[2] Pre-tax operating loss for the year ended December 31, 2012 includes a $20.5 million goodwill impairment loss (see impairment discussion below).

[3] Pre-tax operating loss includes a $6.3 million first quarter 2012 pre-tax charge for the write-down of net assets to their estimated fair value and a $6.3 million settlement charge in the second quarter of 2012 related to actuarial losses recognized upon transition of a pension obligation to the acquirer of the Hearth business. Offsetting these charges was a $3.5 million gain in the second quarter of 2012 related to realized foreign currency translation adjustments.