Reportable Business Segments (Segment Data) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) Segment	Jun. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment			3
Net sales
Net sales	$ 1,239,000,000.0	$ 941,300,000	$ 2,169,400,000	$ 1,665,100,000
Segment profit (loss)
Total segment profit	221,600,000	153,000,000.0	337,200,000	190,600,000
Reconciliation to Operating income:
Net Loss(gain) from natural disaster	0	1,000,000.0	0	2,700,000
Loss from natural disasters, net of insurance recoveries	0	(1,000,000.0)	0	(2,700,000)
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	4,400,000	7,000,000.0	5,900,000	6,100,000
Restructuring charges	1,200,000	10,000,000.0	1,300,000	10,500,000
Operating income	216,000,000.0	136,000,000.0	330,000,000.0	172,300,000
Special inventory write down	0	(1,000,000.0)	0	(1,000,000.0)
Residential Heating & Cooling [Member]
Net sales
Net sales	838,000,000.0	644,800,000	1,444,200,000	1,086,900,000
Segment profit (loss)
Total segment profit	189,700,000	127,300,000	286,100,000	159,800,000
Residential Heating & Cooling [Member] | Sales Channel, Directly to Consumer [Member]
Reconciliation to Operating income:
Revenue from Contract with Customer, Excluding Assessed Tax	0.76	0.76	0.72	0.75
Commercial Heating & Cooling [Member]
Net sales
Net sales	252,800,000	188,300,000	452,000,000.0	366,700,000
Segment profit (loss)
Total segment profit	45,300,000	35,600,000	72,600,000	54,300,000
Commercial Heating & Cooling [Member] | Equipment Sales [Member]
Reconciliation to Operating income:
Revenue from Contract with Customer, Excluding Assessed Tax	0.85	0.86	0.84	0.85
Refrigeration [Member]
Net sales
Net sales	148,200,000	108,200,000	273,200,000	211,500,000
Segment profit (loss)
Total segment profit	13,500,000	8,900,000	21,400,000	9,600,000
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	$ 26,900,000	$ 18,800,000	$ 42,900,000	$ 33,100,000