Discontinued Operations (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended					3 Months Ended	12 Months Ended		3 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2012 Goodwill in assets of discontinued operations [Member]	Dec. 31, 2011 Goodwill in assets of discontinued operations [Member]	Sep. 30, 2012 Service Experts [Member] Goodwill in assets of discontinued operations [Member]	Dec. 31, 2012 Service Experts [Member] Goodwill in assets of discontinued operations [Member]	Dec. 31, 2011 Service Experts [Member] Goodwill in assets of discontinued operations [Member]	Sep. 30, 2012 Hearth [Member]	Jun. 30, 2012 Hearth [Member]	Mar. 31, 2012 Hearth [Member]	Dec. 31, 2011 Hearth [Member]
Discontinued Operations (Textual) [Abstract]
Goodwill	$ 223.2	$ 223.8	$ 179.3				$ 66.0	$ 82.4
Goodwill impairment	7.6					20.5	20.5					7.6
Accumulated impairment charges			17.0	228.5	208.0
Net proceeds from sale of discontinued operations									10.1
Working capital adjustment included in net proceeds from sale of discontinued operations										2.9
Pre-tax charge for write-down of net assets to estimated fair market value											6.3
Settlement charge related to recognized actuarial losses										6.3
Discontinued operation in settlement of foreign currency translation										3.5
Impairment, long-lived assets, property, plant and equipment												5.1
Impairment, finite-lived intangible assets, customer relationships												$ 1.6