Reportable Business Segments (Capital Expenditures by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 163.6	$ 250.2	$ 101.1
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	78.1	59.1	42.4
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	57.8	119.6	29.7
Corporate Segment and Other Operating Segment [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 27.7	$ 71.5	$ 29.0