Reportable Business Segments (Capital Expenditures by Segment) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total capital expenditures	$ 98,300,000	$ 84,300,000	$ 69,900,000
New capital leases	0	0	0
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	38,900,000	36,700,000	28,100,000
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	18,500,000	11,500,000	8,600,000
Refrigeration [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	8,000,000	12,100,000	11,400,000
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total capital expenditures	$ 32,900,000	$ 24,000,000	$ 21,800,000