Reportable Business Segments (Segment Data) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) segment	Jun. 30, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment			2
Net sales
Net sales	$ 1,451.1	$ 1,411.4	$ 2,498.2	$ 2,460.7
Segment profit (loss)
Total segment profit	318.5	283.1	485.3	424.8
Reconciliation to Operating income:
Gain on sale from previous dispositions	(1.6)	0.0	(1.6)	0.0
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	0.0	4.3	0.0	6.4
Operating income	320.1	278.8	486.9	418.4
Home Comfort Solutions
Net sales
Net sales	982.3	936.2	1,656.9	1,617.2
Segment profit (loss)
Total segment profit	228.5	202.6	340.6	313.7
Building Climate Solutions
Net sales
Net sales	468.8	407.5	841.3	716.1
Segment profit (loss)
Total segment profit	114.0	103.0	192.2	153.0
Corporate and Other
Net sales
Net sales	0.0	67.7	0.0	127.4
Segment profit (loss)
Total segment profit	$ (24.0)	$ (22.5)	$ (47.5)	$ (41.9)