Reportable Business Segments (Segment Data) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net sales
Net sales	$ 793.4	$ 715.2
Segment profit (loss)
Total segment profit	64.7	46.7
Reconciliation to Operating income:
Special product quality adjustments	0.0	0.4
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	3.8	3.6
Restructuring charges (gains)	0.1	(0.2)
Operating income	60.8	43.7
Residential Heating & Cooling [Member]
Net sales
Net sales	419.8	377.3
Segment profit (loss)
Total segment profit	42.5	38.3
Commercial Heating & Cooling [Member]
Net sales
Net sales	195.5	170.3
Segment profit (loss)
Total segment profit	19.1	14.2
Refrigeration [Member]
Net sales
Net sales	178.1	167.6
Segment profit (loss)
Total segment profit	14.1	9.0
Corporate & Other [Member]
Segment profit (loss)
Total segment profit	$ 11.0	$ 14.8