Reportable Business Segments (Equity Method Investments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Total income from equity method investments	$ 2.1	$ 2.5	$ 3.3	$ 3.7
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total income from equity method investments	(1.7)	(1.7)	(2.4)	(2.6)
Commercial Heating and Cooling
Segment Reporting Information [Line Items]
Total income from equity method investments	(0.4)	(0.8)	(0.8)	(1.2)
Corporate & Other
Segment Reporting Information [Line Items]
Total income from equity method investments	$ 0.0	$ 0.0	$ (0.1)	$ 0.1