Revenue Recognition (Revenue by Business Segment by Geography) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	$ 5,400,000	$ 700,000	$ 8,500,000	$ 6,800,000
Revenue, Net	1,426,800,000	1,498,100,000	4,000,300,000	3,996,300,000
Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	912,900,000	1,032,800,000	2,643,600,000	2,689,700,000
Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	513,900,000	465,300,000	1,356,700,000	1,306,600,000
Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net	0	0	0	0
Sales Channel, Directly to Consumer | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.75	0.73	0.74	0.74
Equipment Sales | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.80	0.80	0.80	0.81
CANADA
Disaggregation of Revenue [Line Items]
Revenue, Net	98,400,000	85,100,000	274,800,000	231,400,000
CANADA | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	62,800,000	61,700,000	184,700,000	169,000,000.0
CANADA | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	35,600,000	23,400,000	90,100,000	62,400,000
CANADA | Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net	0	0	0	0
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue, Net	1,328,400,000	1,413,000,000	3,725,500,000	3,764,900,000
UNITED STATES | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	850,100,000	971,100,000	2,458,900,000	2,520,700,000
UNITED STATES | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	478,300,000	441,900,000	1,266,600,000	1,244,200,000
UNITED STATES | Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 0	$ 0	$ 0	$ 0