Revenue Recognition (Revenue by Business Segment by Geography) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized		$ 2,800,000		$ 7,000,000
Revenue, Net	$ 1,498,100,000	1,366,300,000	$ 3,996,300,000	3,827,100,000
Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	1,032,800,000	896,300,000	2,689,700,000	2,513,600,000
Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	465,300,000	405,500,000	1,306,600,000	1,121,500,000
Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net	0	64,500,000	0	192,000,000.0
Sales Channel, Directly to Consumer | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0.77		0.75
Equipment Sales | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		0.88		0.87
International [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	0	64,500,000	0	192,000,000.0
International [Member] | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	0	0	0	0
International [Member] | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	0	0	0	0
International [Member] | Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net	0	64,500,000	0	192,000,000.0
CANADA
Disaggregation of Revenue [Line Items]
Revenue, Net	85,100,000	82,900,000	231,400,000	231,600,000
CANADA | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	61,700,000	54,200,000	169,000,000.0	163,600,000
CANADA | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	23,400,000	28,700,000	62,400,000	68,000,000.0
CANADA | Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net	0	0	0	0
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue, Net	1,413,000,000	1,218,900,000	3,764,900,000	3,403,500,000
UNITED STATES | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	971,100,000	842,100,000	2,520,700,000	2,350,000,000
UNITED STATES | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	441,900,000	376,800,000	1,244,200,000	1,053,500,000
UNITED STATES | Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 0	$ 0	$ 0	$ 0