Reportable Business Segments (Segment Data) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Segment	Sep. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment			3
Net sales
Net sales	$ 1,059,900,000	$ 1,055,000,000	$ 3,229,300,000	$ 2,720,100,000
Segment profit (loss)
Total segment profit	164,800,000	176,500,000	502,000,000.0	367,200,000
Reconciliation to Operating income:
Net Loss(gain) from natural disaster	0	4,900,000	0	7,600,000
Loss from natural disasters, net of insurance recoveries	0	(4,900,000)	0	(7,600,000)
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	2,900,000	4,400,000	8,700,000	10,500,000
Restructuring charges	300,000	100,000	1,600,000	10,600,000
Operating income	162,700,000	167,100,000	492,700,000	339,500,000
Special inventory write down	(1,100,000)	0	(1,000,000.0)	(1,000,000.0)
Residential Heating & Cooling [Member]
Net sales
Net sales	711,000,000.0	722,000,000.0	2,155,300,000	1,808,800,000
Segment profit (loss)
Total segment profit	144,000,000.0	153,000,000.0	430,100,000	312,800,000
Residential Heating & Cooling [Member] | Sales Channel, Directly to Consumer [Member]
Reconciliation to Operating income:
Revenue from Contract with Customer, Excluding Assessed Tax	0.73	0.74	0.72	0.75
Commercial Heating & Cooling [Member]
Net sales
Net sales	211,500,000	207,900,000	663,400,000	574,600,000
Segment profit (loss)
Total segment profit	22,600,000	38,800,000	95,300,000	93,100,000
Commercial Heating & Cooling [Member] | Equipment Sales [Member]
Reconciliation to Operating income:
Revenue from Contract with Customer, Excluding Assessed Tax	0.81	0.83	0.83	0.84
Refrigeration [Member]
Net sales
Net sales	137,400,000	125,100,000	410,600,000	336,700,000
Segment profit (loss)
Total segment profit	14,500,000	13,000,000.0	35,800,000	22,600,000
Refrigeration [Member] | service revenue
Reconciliation to Operating income:
Revenue from Contract with Customer, Excluding Assessed Tax	0.01
Corporate & Other [Member]
Segment profit (loss)
Total segment profit	$ 16,300,000	$ 28,300,000	$ 59,200,000	$ 61,300,000