Reportable Business Segments (Segment Data) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Segment	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment			3
Assets	$ 2,214.8		$ 2,214.8		$ 1,817.2
Net sales
Net sales	1,032.9	$ 1,030.2	2,922.2	$ 3,040.4
Segment profit (loss)
Total segment profit	175.3	154.6	475.6	430.8
Reconciliation to Operating income:
Special inventory write down	0.0	0.0	0.0	0.2
Special Product Quality Adjustment	(0.5)	0.0	(1.0)	0.0
Loss (gain), net on sale of businesses and related property	0.2	6.2	9.1	25.8
Loss on assets held for sale		0.3		0.3
Net Loss(gain) from natural disaster	1.2	0.0	(11.6)	0.0
Partial advance of insurance recoveries related to lost profits	8.0	0.0	0.0	0.0
Loss (gain) from insurance recoveries, net of losses incurred	7.1	(0.3)	85.4	(0.3)
non-cash pension settlement loss	0.0	0.0	(60.6)	0.0
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	3.5	2.4	7.3	9.3
Restructuring charges	6.1	0.5	6.5	1.9
Operating income	156.8	145.2	465.3	393.3
Residential Heating & Cooling [Member]
Segment Reporting Information [Line Items]
Assets	1,165.3		1,165.3		837.4
Net sales
Net sales	637.6	594.7	1,792.2	1,764.4
Segment profit (loss)
Total segment profit	126.5	113.0	366.6	317.9
Commercial Heating & Cooling [Member]
Segment Reporting Information [Line Items]
Assets	423.4		423.4		349.5
Net sales
Net sales	253.3	236.9	687.9	668.1
Segment profit (loss)
Total segment profit	47.1	44.8	116.0	117.6
Refrigeration [Member]
Segment Reporting Information [Line Items]
Assets	415.7		415.7		462.9
Net sales
Net sales	142.0	198.6	442.1	607.9
Segment profit (loss)
Total segment profit	19.8	24.9	47.3	57.1
Corporate & Other [Member]
Segment Reporting Information [Line Items]
Assets	210.4		210.4		$ 167.4
Segment profit (loss)
Total segment profit	$ 18.1	$ 28.1	$ 54.3	$ 61.8