Reportable Business Segments (Depreciation and Amortization Expense 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]
Total depreciation and amortization	$ 32.6	$ 26.8	$ 61.8	$ 52.4
Operating Segments
Segment Reporting Information [Line Items]
Total depreciation and amortization	25.3	19.5	47.7	37.8
Corporate and Other
Segment Reporting Information [Line Items]
Total depreciation and amortization	7.3	7.3	14.1	14.6
Residential Heating and Cooling [Member] | Operating Segments
Segment Reporting Information [Line Items]
Total depreciation and amortization	13.0	11.5	23.7	21.9
Commercial Heating and Cooling | Operating Segments
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 12.3	$ 8.0	$ 24.0	$ 15.9