Reportable Business Segments (Depreciation and Amortization Expense by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 64.6	$ 58.1	$ 62.8
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	24.9	21.0	20.7
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	10.1	9.8	9.7
Refrigeration [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	9.9	9.7	15.5
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 19.7	$ 17.6	$ 16.9