Reportable Business Segments (Depreciation and Amortization Expense by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 66.0	$ 64.6	$ 58.1
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	26.6	24.9	21.0
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	10.4	10.1	9.8
Refrigeration [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	7.1	9.9	9.7
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 21.9	$ 19.7	$ 17.6