Reportable Business Segments (Key Financial Information by Segment) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Net sales	$ 1,500,900,000	$ 1,451,100,000	$ 2,573,500,000	$ 2,498,200,000
Cost of Goods Sold	978,400,000	962,900,000	1,722,500,000	1,670,000,000
Selling, general and administrative	173,300,000	168,500,000	344,600,000	339,200,000
Other (income) expense	(4,800,000)	1,200,000	(3,200,000)	3,700,000
Segment Profit And Loss	354,000,000.0	318,500,000	509,600,000	485,300,000
Revenue from transactions with major customers	0	0	0	0
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting Information [Line Items]
Net sales	0	0	0	0
Cost of Goods Sold	1,200,000	800,000	900,000	500,000
Selling, general and administrative	20,800,000	18,700,000	33,400,000	38,200,000
Other (income) expense	1,700,000	4,500,000	4,200,000	8,800,000
Segment Profit And Loss	(23,700,000)	(24,000,000.0)	(38,400,000)	(47,500,000)
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Net sales	1,009,300,000	982,300,000	1,730,700,000	1,656,900,000
Residential Heating and Cooling [Member] | Operating Segments
Segment Reporting Information [Line Items]
Net sales	1,009,300,000	982,300,000	1,730,700,000	1,656,900,000
Cost of Goods Sold	668,300,000	661,100,000	1,175,500,000	1,127,200,000
Selling, general and administrative	91,400,000	94,500,000	189,800,000	192,100,000
Other (income) expense	(5,600,000)	(1,800,000)	(6,600,000)	(3,000,000.0)
Segment Profit And Loss	255,200,000	228,500,000	372,000,000.0	340,600,000
Commercial Heating and Cooling
Segment Reporting Information [Line Items]
Net sales	491,600,000	468,800,000	842,800,000	841,300,000
Commercial Heating and Cooling | Operating Segments
Segment Reporting Information [Line Items]
Net sales	491,600,000	468,800,000	842,800,000	841,300,000
Cost of Goods Sold	308,900,000	301,000,000.0	546,000,000.0	542,300,000
Selling, general and administrative	61,100,000	55,300,000	121,400,000	108,900,000
Other (income) expense	(900,000)	(1,500,000)	(800,000)	(2,100,000)
Segment Profit And Loss	$ 122,500,000	$ 114,000,000.0	$ 176,000,000.0	$ 192,200,000