Reportable Business Segments (Segment Data) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net sales
Net sales	$ 1,102.1	$ 1,019.2	$ 1,895.6	$ 1,734.4
Segment profit (loss)
Total segment profit	182.9	161.1	247.6	207.7
Reconciliation to Operating income:
Special product quality adjustments	5.2	0.0	5.2	(0.4)
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	2.2	(0.4)	6.0	3.1
Restructuring charges	0.1	0.8	0.2	0.6
Operating income	175.4	160.7	236.2	204.4
Residential Heating & Cooling [Member]
Net sales
Net sales	653.5	574.5	1,073.3	951.8
Segment profit (loss)
Total segment profit	140.5	115.9	182.9	154.1
Commercial Heating & Cooling [Member]
Net sales
Net sales	258.6	252.9	454.1	423.3
Segment profit (loss)
Total segment profit	44.7	47.4	63.8	61.7
Refrigeration [Member]
Net sales
Net sales	190.0	191.8	368.2	359.3
Segment profit (loss)
Total segment profit	21.6	21.3	35.7	30.3
Corporate & Other [Member]
Segment profit (loss)
Total segment profit	$ 23.9	$ 23.5	$ 34.8	$ 38.4