Revenue Recognition (Revenue by Business Segment by Geography) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	$ 1,600,000	$ 1,500,000
Revenue, Net	930,500,000	723,800,000
Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	606,300,000	442,100,000
Commercial Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	199,200,000	178,400,000
Refrigeration [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	125,000,000.0	103,300,000
Equipment Sales [Member] | Commercial Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.83	0.84
International [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	49,400,000	44,000,000.0
International [Member] | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	0	0
International [Member] | Commercial Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	0	200,000
International [Member] | Refrigeration [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	49,400,000	43,800,000
CANADA
Disaggregation of Revenue [Line Items]
Revenue, Net	64,400,000	46,800,000
CANADA | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	47,500,000	29,700,000
CANADA | Commercial Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	16,900,000	17,100,000
CANADA | Refrigeration [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	0	0
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue, Net	816,700,000	633,000,000.0
UNITED STATES | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	558,800,000	412,400,000
UNITED STATES | Commercial Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	182,300,000	161,100,000
UNITED STATES | Refrigeration [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 75,600,000	$ 59,500,000