Revenue Recognition (Revenue by Business Segment by Geography) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	$ 2,800,000	$ 3,600,000	$ 7,000,000	$ 9,500,000
Revenue, Net	1,366,300,000	1,244,900,000	3,827,100,000	3,624,600,000
Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	896,300,000	835,300,000	2,513,600,000	2,494,900,000
Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	405,500,000	352,300,000	1,121,500,000	959,200,000
Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net	64,500,000	57,300,000	192,000,000.0	170,500,000
Sales Channel, Directly to Consumer | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.77	0.72	0.75	0.70
Equipment Sales | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.88	0.88	87	0.87
International [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	64,500,000	57,400,000	192,000,000.0	171,100,000
International [Member] | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net		0	0	0
International [Member] | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	0	100,000	0	600,000
International [Member] | Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net	64,500,000	57,300,000	192,000,000.0	170,500,000
CANADA
Disaggregation of Revenue [Line Items]
Revenue, Net	82,900,000	75,800,000	231,600,000	226,900,000
CANADA | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	54,200,000	55,500,000	163,600,000	183,700,000
CANADA | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	28,700,000	20,300,000	68,000,000.0	43,200,000
CANADA | Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net		0	0	0
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenue, Net	1,218,900,000	1,111,700,000	3,403,500,000	3,226,600,000
UNITED STATES | Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenue, Net	842,100,000	779,800,000	2,350,000,000	2,311,200,000
UNITED STATES | Commercial Heating and Cooling
Disaggregation of Revenue [Line Items]
Revenue, Net	$ 376,800,000	331,900,000	1,053,500,000	915,400,000
UNITED STATES | Corporate & Other
Disaggregation of Revenue [Line Items]
Revenue, Net		$ 0	$ 0	$ 0