Reportable Business Segments (Net Sales and Segment Profit (Loss) and Reconciliation to Income from Continuing Operations) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 4,981,900,000	$ 4,718,400,000	$ 4,194,100,000
Segment Profit (Loss)
Total segment profit	857,100,000	665,800,000	603,900,000
Reconciliation to Operating income:
Gain (Loss) on Disposition of Business and Related Property	(14,100,000)	0	0
Special Product Quality Adjustment	0	0	(2,500,000)
Impairment charges	63,200,000	0	0
Items in (Gains) Losses and other expenses, net that are excluded from segment profit (loss)	14,800,000	8,100,000	14,300,000
Restructuring charges	3,100,000	1,500,000	1,800,000
Operating income	790,100,000	$ 656,200,000	$ 590,300,000
Revenue from transactions with major customers	$ 0
Minimum percentage of consolidated net sales from single customer	10.00%	10.00%	10.00%
Residential Heating & Cooling [Member]
Segment Reporting Information [Line Items]
Revenues	$ 3,222,900,000	$ 3,198,300,000	$ 2,775,600,000
Segment Profit (Loss)
Total segment profit	610,200,000	596,900,000	540,300,000
Commercial Heating & Cooling [Member]
Segment Reporting Information [Line Items]
Revenues	1,511,400,000	1,286,400,000	1,188,800,000
Segment Profit (Loss)
Total segment profit	340,800,000	162,900,000	164,600,000
Corporate & other [Member]
Segment Reporting Information [Line Items]
Revenues	247,600,000	233,700,000	229,700,000
Segment Profit (Loss)
Total segment profit	$ (93,900,000)	$ (94,000,000.0)	$ (101,000,000.0)