Reportable Business Segments (Equity Method Investments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total income from equity method investments	$ 6.0	$ 7.9	$ 8.5
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total income from equity method investments	(5.4)	(4.4)	(5.5)
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total income from equity method investments	$ (0.6)	$ (3.5)	$ (3.0)