Reportable Business Segments (Segment Data) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net sales
Net sales	$ 1,175.4	$ 1,102.1	$ 2,010.2	$ 1,895.6
Segment profit (loss)
Total segment profit	205.3	182.9	276.1	247.6
Reconciliation to Operating income:
Special inventory write down	0.0	0.0	0.2	0.0
One time inventory write down	0.0	5.2	0.0	5.2
(Gain) loss, net on sale of business and related property	(22.1)	0.0	(11.8)	0.0
Loss on assets held for sale	31.4	0.0	31.4	0.0
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	0.4	2.2	6.9	6.0
Restructuring charges	0.5	0.1	1.3	0.2
Operating income	195.1	175.4	248.1	236.2
Residential Heating & Cooling [Member]
Net sales
Net sales	716.0	653.5	1,169.7	1,073.3
Segment profit (loss)
Total segment profit	153.6	140.5	204.9	182.9
Commercial Heating & Cooling [Member]
Net sales
Net sales	292.2	258.6	497.7	454.1
Segment profit (loss)
Total segment profit	52.6	44.7	72.1	63.8
Refrigeration [Member]
Net sales
Net sales	167.2	190.0	342.8	368.2
Segment profit (loss)
Total segment profit	21.9	21.6	33.0	35.7
Corporate & Other [Member]
Segment profit (loss)
Total segment profit	22.8	$ 23.9	33.9	$ 34.8
UNITED STATES
Net sales
Net sales	1,095.7		1,838.3
UNITED STATES | Residential Heating & Cooling [Member]
Net sales
Net sales	716.0		1,169.7
UNITED STATES | Commercial Heating & Cooling [Member]
Net sales
Net sales	252.1		431.2
UNITED STATES | Refrigeration [Member]
Net sales
Net sales	$ 127.6		$ 237.4