Reportable Business Segments (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of depreciation and amortization expense by business segment
Total depreciation and amortization	$ 55.4	$ 56.6	$ 48.9
Residential Heating and Cooling [Member]
Summary of depreciation and amortization expense by business segment
Total depreciation and amortization	19.9	19.6	18.8
Commercial Heating and Cooling [Member]
Summary of depreciation and amortization expense by business segment
Total depreciation and amortization	8.5	8.6	8.5
Refrigeration [Member]
Summary of depreciation and amortization expense by business segment
Total depreciation and amortization	13.0	14.8	8.7
Corporate and Other [Member]
Summary of depreciation and amortization expense by business segment
Total depreciation and amortization	$ 14.0	$ 13.6	$ 12.9