Reportable Business Segments (Segment Data) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net sales
Net sales	$ 834.8	$ 793.4
Segment profit (loss)
Total segment profit	70.8	64.7
Reconciliation to Operating income:
One time inventory write down	0.1	0.0
Loss on assets held for sale	10.3	0.0
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	6.5	3.8
Restructuring charges	0.9	0.1
Operating income	53.0	60.8
Residential Heating & Cooling [Member]
Net sales
Net sales	453.7	419.8
Segment profit (loss)
Total segment profit	51.3	42.5
Commercial Heating & Cooling [Member]
Net sales
Net sales	205.5	195.5
Segment profit (loss)
Total segment profit	19.5	19.1
Refrigeration [Member]
Net sales
Net sales	175.6	178.1
Segment profit (loss)
Total segment profit	11.2	14.1
Corporate & Other [Member]
Segment profit (loss)
Total segment profit	$ 11.2	$ 11.0