Reportable Business Segments (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010
Total assets by business segment
Total assets	$ 1,705.7		$ 1,692.0
Discontinued operations	0		0
Total assets including discontinued operation	1,705.7		1,692.0
Residential Heating & Cooling [Member]
Total assets by business segment
Total assets	481.2		519.8
Commercial Heating & Cooling [Member]
Total assets by business segment
Total assets	257.3		252.7
Service Experts [Member]
Total assets by business segment
Total assets	182.0		186.2
Refrigeration [Member]
Total assets by business segment
Total assets	558.2		389.7
Corporate and Other [Member]
Total assets by business segment
Total assets	234.8		354.9
Eliminations [Member]
Total assets by business segment
Total assets	$ (7.8)	[1]	$ (11.3)	[1]

[1] (1) Eliminations consist of net intercompany receivables and intercompany profit included in inventory from products sold between business segments, such as products sold to Service Experts by the Residential Heating & Cooling segment.