Revenue Recognition (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Contract with Customer, Liability, Revenue Recognized	$ 3,000,000	$ 3,700,000
Residential Heating and Cooling [Member] | Sales Channel, Directly to Consumer
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0.70	0.66
Commercial Heating and Cooling | Equipment Sales
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 0.85	$ 0.87