Reportable Business Segments (Depreciation and Amortization Expense by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 95.1	$ 86.0	$ 77.9
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	39.0	35.3	31.5
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	25.6	19.4	17.9
Corporate Segment and Other Operating Segment [Member]
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 30.5	$ 31.3	$ 28.5