Reportable Business Segments (Segment Data) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) Segment	Mar. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment	3
Net sales
Net sales	$ 723.8	$ 790.3
Segment profit (loss)
Total segment profit	37.6	98.1
Reconciliation to Operating income:
Loss on sale of business	0.0	8.5
Net Loss(gain) from natural disaster	1.6
Loss (gain) from natural disaster, net of insurance recoveries	(1.6)	6.9
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	(0.9)	1.3
Restructuring charges	0.5	0.5
Operating income	36.4	94.7
Residential Heating & Cooling [Member]
Net sales
Net sales	442.1	465.6
Segment profit (loss)
Total segment profit	32.5	86.7
Commercial Heating & Cooling [Member]
Net sales
Net sales	178.4	173.3
Segment profit (loss)
Total segment profit	18.7	15.1
Refrigeration [Member]
Net sales
Net sales	103.3	151.4
Segment profit (loss)
Total segment profit	0.7	8.4
Corporate & Other [Member]
Segment profit (loss)
Total segment profit	$ 14.3	$ 12.1