Reportable Business Segments (Segment Data) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) Segment	Jun. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment			3
Net sales
Net sales	$ 941,300,000	$ 1,099,100,000	$ 1,665,100,000	$ 1,889,400,000
Segment profit (loss)
Total segment profit	153,000,000.0	202,300,000	190,600,000	300,300,000
Reconciliation to Operating income:
Loss on sale of business	0	400,000	0	8,800,000
Net Loss(gain) from natural disaster	1,000,000.0	(5,900,000)	2,700,000	(12,800,000)
Loss (gain) from natural disaster, net of insurance recoveries	(1,000,000.0)	5,900,000	(2,700,000)	12,800,000
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	7,000,000.0	2,600,000	6,100,000	3,900,000
Restructuring charges	10,000,000.0	(100,000)	10,500,000	400,000
Operating income	136,000,000.0	213,800,000	172,300,000	308,500,000
Partial advance of insurance recoveries related to lost profits	0	(8,000,000.0)	0	(8,000,000.0)
Special inventory write down	(1,000,000.0)	(500,000)	(1,000,000.0)	(500,000)
Residential Heating & Cooling [Member]
Net sales
Net sales	644,800,000	689,100,000	1,086,900,000	1,154,600,000
Segment profit (loss)
Total segment profit	127,300,000	153,400,000	159,800,000	240,100,000
Residential Heating & Cooling [Member] | Sales Channel, Directly to Consumer [Member]
Reconciliation to Operating income:
Revenue from Contract with Customer, Excluding Assessed Tax	0.76	0.75	0.75	0.74
Commercial Heating & Cooling [Member]
Net sales
Net sales	188,300,000	261,300,000	366,700,000	434,700,000
Segment profit (loss)
Total segment profit	35,600,000	53,900,000	54,300,000	68,900,000
Commercial Heating & Cooling [Member] | Equipment Sales [Member]
Reconciliation to Operating income:
Revenue from Contract with Customer, Excluding Assessed Tax	0.86	0.87	0.85	0.85
Refrigeration [Member]
Net sales
Net sales	108,200,000	148,700,000	211,500,000	300,100,000
Segment profit (loss)
Total segment profit	8,900,000	19,100,000	9,600,000	27,500,000
Corporate & Other [Member]
Segment profit (loss)
Total segment profit	$ 18,800,000	$ 24,100,000	$ 33,100,000	$ 36,200,000