Reportable Business Segments (Capital Expenditures by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 35.7	$ 28.5	$ 91.2	$ 54.0
Operating Segments
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	26.5	18.0	49.1	35.7
Corporate and Other
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	9.2	10.5	42.1	18.3
Residential Heating and Cooling [Member] | Operating Segments
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	10.1	11.8	25.2	23.2
Commercial Heating and Cooling | Operating Segments
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 16.4	$ 6.2	$ 23.9	$ 12.5