Reportable Business Segments (Capital Expenditures by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 28.5	$ 32.7	$ 54.0	$ 62.2
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	11.8	14.6	23.2	28.8
Commercial Heating and Cooling
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	6.2	11.8	12.5	22.2
Corporate & Other
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 10.5	$ 6.3	$ 18.3	$ 11.2