Reportable Business Segments (Equity Method Investments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total income from equity method investments	$ 8.5	$ 5.1	$ 11.8
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total income from equity method investments	(3.0)	(4.2)	(4.9)
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total income from equity method investments	$ (5.5)	$ (0.9)	$ (6.9)