Reportable Business Segments (Capital Expenditures by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 250.2	$ 101.1	$ 106.8
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	59.1	42.4	70.0
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	119.6	29.7	9.7
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 71.5	$ 29.0	$ 27.1