Reportable Business Segments (Capital Expenditures by Segment) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 55.5	$ 25.5
Operating Segments
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	22.6	17.7
Corporate and Other
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	32.9	7.8
Residential Heating and Cooling [Member] | Operating Segments
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	15.1	11.4
Commercial Heating and Cooling | Operating Segments
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 7.5	$ 6.3