Reportable Business Segments (Segment Data) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) Segment	Sep. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment			3
Net sales
Net sales	$ 1,055,000,000.0	$ 1,032,900,000	$ 2,720,100,000	$ 2,922,200,000
Segment profit (loss)
Total segment profit	176,500,000	175,300,000	367,200,000	475,600,000
Reconciliation to Operating income:
Loss on sale of business	0	200,000	0	9,100,000
Net Loss(gain) from natural disaster	4,900,000	1,200,000	7,600,000	(11,600,000)
Loss (gain) from natural disasters, net of insurance recoveries	(4,900,000)	7,100,000	(7,600,000)	85,400,000
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	4,400,000	3,500,000	10,500,000	7,300,000
Restructuring charges	100,000	6,100,000	10,600,000	6,500,000
Operating income	167,100,000	156,800,000	339,500,000	465,300,000
Partial advance of insurance recoveries related to lost profits	0	8,000,000.0	0	0
Special inventory write down	0	(500,000)	(1,000,000.0)	(1,000,000.0)
Residential Heating & Cooling [Member]
Net sales
Net sales	722,000,000.0	637,600,000	1,808,800,000	1,792,200,000
Segment profit (loss)
Total segment profit	153,000,000.0	126,500,000	312,800,000	366,600,000
Residential Heating & Cooling [Member] | Sales Channel, Directly to Consumer [Member]
Reconciliation to Operating income:
Revenue from Contract with Customer, Excluding Assessed Tax	0.74	0.74	0.75	0.74
Commercial Heating & Cooling [Member]
Net sales
Net sales	207,900,000	253,300,000	574,600,000	687,900,000
Segment profit (loss)
Total segment profit	38,800,000	47,100,000	93,100,000	116,000,000.0
Commercial Heating & Cooling [Member] | Equipment Sales [Member]
Reconciliation to Operating income:
Revenue from Contract with Customer, Excluding Assessed Tax	0.83	0.86	0.84	0.86
Refrigeration [Member]
Net sales
Net sales	125,100,000	142,000,000.0	336,700,000	442,100,000
Segment profit (loss)
Total segment profit	13,000,000.0	19,800,000	22,600,000	47,300,000
Corporate & Other [Member]
Segment profit (loss)
Total segment profit	$ 28,300,000	$ 18,100,000	$ 61,300,000	$ 54,300,000