Reportable Business Segments (Capital Expenditures by Segment) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total capital expenditures	$ 105,600,000	$ 95,200,000	$ 98,300,000
New capital leases		0
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	59,200,000	45,200,000	38,900,000
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	11,300,000	12,500,000	14,700,000
Refrigeration [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	9,400,000	9,300,000	11,800,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	$ 25,700,000	$ 28,200,000	$ 32,900,000