Reportable Business Segments (Capital Expenditures by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 118.8	$ 163.6	$ 250.2
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	49.0	78.1	59.1
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	37.7	57.8	119.6
Corporate Segment and Other Operating Segment [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 32.1	$ 27.7	$ 71.5