Revenue Recognition (Revenue by Business Segment by Geography) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	$ 5,700,000	$ 3,000,000
Revenue, Net	1,047,100,000	1,049,400,000
Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	674,600,000	681,000,000.0
Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	372,500,000	308,700,000
Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net	0	59,700,000
Sales Channel, Directly to Consumer | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.74	0.70
Equipment Sales | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.83	0.85
International [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	0	59,700,000
International [Member] | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	0	0
International [Member] | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	0	0
International [Member] | Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net	0	59,700,000
CANADA
Disaggregation of Revenue [Line Items]
Revenue, Net	63,700,000	55,800,000
CANADA | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	48,500,000	41,700,000
CANADA | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	15,200,000	14,100,000
CANADA | Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net	0	0
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue, Net	983,400,000	933,900,000
UNITED STATES | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	626,100,000	639,300,000
UNITED STATES | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	357,300,000	294,600,000
UNITED STATES | Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 0	$ 0