Reportable Business Segments (Capital Expenditures by Segment) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total capital expenditures	$ 95,200,000	$ 98,300,000	$ 84,300,000
New capital leases	0	0	0
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	45,200,000	38,900,000	36,700,000
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	14,000,000	18,500,000	11,500,000
Refrigeration [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	7,800,000	8,000,000	12,100,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	$ 28,200,000	$ 32,900,000	$ 24,000,000