Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Service Experts [Member]
Summary of net trade sales and pre-tax operating losses
Net trade sales	$ 73.5	[1]	$ 81.9	[1]
Pre-tax operating income (loss)	(15.1)	[1],[2]	(14.3)	[1],[2]
Gain on sale of business	1.7		0
Hearth [Member]
Summary of net trade sales and pre-tax operating losses
Net trade sales	0		18.6
Pre-tax operating income (loss)	$ 0.1	[3]	$ (8.5)	[3]

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

[2] Pre-tax operating loss for the three months ended March 31, 2013 includes $2.3 million in retention bonus and severance costs and $0.2 million in stock-based compensation expense

[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.