Reportable Business Segments (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Total assets by business segment
Total assets, excluding discontinued operations	$ 1,593.3	$ 1,545.2	$ 1,513.1
Total assets, discontinued operations	98.6	160.5	178.9
Total assets	1,691.9	1,705.7	1,692.0
Residential Heating and Cooling [Member]
Total assets by business segment
Total assets	457.5	453.2	474.6
Commercial Heating and Cooling [Member]
Total assets by business segment
Total assets	321.9	306.4	299.1
Refrigeration [Member]
Total assets by business segment
Total assets	585.3	558.2	389.7
Corporate and Other [Member]
Total assets by business segment
Total assets	$ 228.6	$ 227.4	$ 349.7