Reportable Business Segments (Depreciation and Amortization Expense by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 71.1	$ 66.0	$ 64.6
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	30.0	26.6	24.9
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	12.5	8.6	8.6
Refrigeration [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	7.9	8.9	11.4
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 20.7	$ 21.9	$ 19.7