Reportable Business Segments (Depreciation and Amortization Expense by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 72.4	$ 72.6	$ 71.1
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	27.6	28.5	30.0
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	13.2	13.5	12.5
Refrigeration [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	7.8	7.8	7.9
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 23.8	$ 22.8	$ 20.7