Reportable Business Segments (Segment Data) (Details)	3 Months Ended
	Mar. 31, 2022 USD ($) Segment	Mar. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment	3
Net sales
Net sales	$ 1,013,400,000	$ 930,500,000
Segment profit (loss)
Total segment profit	114,600,000	115,700,000
Reconciliation to Operating income:
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	2,200,000	1,500,000
Restructuring charges	500,000	100,000
Operating income	111,900,000	114,100,000
Residential Heating & Cooling [Member]
Net sales
Net sales	682,200,000	606,300,000
Segment profit (loss)
Total segment profit	107,600,000	96,400,000
Residential Heating & Cooling [Member] | Sales Channel, Directly to Consumer [Member]
Reconciliation to Operating income:
Revenue from Contract with Customer, Excluding Assessed Tax	0.66	0.67
Commercial Heating & Cooling
Net sales
Net sales	187,700,000	199,200,000
Segment profit (loss)
Total segment profit	6,300,000	27,400,000
Commercial Heating & Cooling | Equipment Sales
Reconciliation to Operating income:
Revenue from Contract with Customer, Excluding Assessed Tax	0.80	0.83
Refrigeration [Member]
Net sales
Net sales	143,500,000	125,000,000.0
Segment profit (loss)
Total segment profit	14,100,000	7,900,000
Corporate & Other [Member]
Segment profit (loss)
Total segment profit	$ 13,400,000	$ 16,000,000.0