Reportable Business Segments (Capital Expenditures by Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 25.5	$ 29.5
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	11.4	14.2
Commercial Heating and Cooling
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	6.3	10.4
Corporate & Other
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 7.8	$ 4.9