Reportable Business Segments (Segment Data) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) Segment	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment			3
Assets	$ 2,340.4		$ 2,340.4		$ 1,817.2
Net sales
Net sales	1,099.1	$ 1,175.4	1,889.4	$ 2,010.2
Segment profit (loss)
Total segment profit	202.3	205.3	300.3	276.1
Reconciliation to Operating income:
Special inventory write down	0.0	0.0	0.0	0.2
Special Product Quality Adjustment	(0.5)	0.0	(0.5)	0.0
Loss (gain) on sale of businesses and related property	0.4	(22.1)	8.8	(11.8)
Loss on assets held for sale	0.0	31.4	0.0	31.4
Partial advance of insurance recoveries related to lost profits	(8.0)	0.0	(8.0)	0.0
Gain from insurance recoveries, net of losses incurred	(5.9)	0.0	(12.8)	0.0
non-cash pension settlement loss	60.6	0.0	60.6	0.0
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	2.6	0.4	3.9	6.9
Restructuring charges	(0.1)	0.5	0.4	1.3
Operating income	213.8	195.1	308.5	248.1
Residential Heating & Cooling [Member]
Segment Reporting Information [Line Items]
Assets	1,269.0		1,269.0		837.4
Net sales
Net sales	689.1	716.0	1,154.6	1,169.7
Segment profit (loss)
Total segment profit	153.4	153.6	240.1	204.9
Commercial Heating & Cooling [Member]
Segment Reporting Information [Line Items]
Assets	436.0		436.0		349.5
Net sales
Net sales	261.3	252.1	434.7	431.2
Segment profit (loss)
Total segment profit	53.9	50.8	68.9	72.8
Refrigeration [Member]
Segment Reporting Information [Line Items]
Assets	412.6		412.6		462.9
Net sales
Net sales	148.7	207.3	300.1	409.3
Segment profit (loss)
Total segment profit	19.1	23.4	27.5	32.1
Corporate & Other [Member]
Segment Reporting Information [Line Items]
Assets	222.8		222.8		$ 167.4
Segment profit (loss)
Total segment profit	$ 24.1	$ 22.5	$ 36.2	$ 33.7