Reportable Business Segments (Segment Data) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) Segment	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | Segment	3
Assets	$ 2,105.7		$ 1,817.2
Net sales
Net sales	790.3	$ 834.8
Segment profit (loss)
Total segment profit	98.1	70.8
Reconciliation to Operating income:
Special inventory write down	0.0	0.1
Loss on sale of business	8.5	0.0
Loss on assets held for sale	0.0	10.3
Gain from insurance recoveries, net of losses incurred	(6.9)	0.0
Items in Losses (gains) and other expenses, net that are excluded from segment profit (loss)	1.3	6.5
Restructuring charges	0.5	0.9
Operating income	94.7	53.0
Residential Heating & Cooling [Member]
Segment Reporting Information [Line Items]
Assets	1,108.1		837.4
Net sales
Net sales	465.6	453.7
Segment profit (loss)
Total segment profit	86.7	51.3
Commercial Heating & Cooling [Member]
Segment Reporting Information [Line Items]
Assets	371.0		349.5
Net sales
Net sales	173.3	179.1
Segment profit (loss)
Total segment profit	15.1	22.0
Refrigeration [Member]
Segment Reporting Information [Line Items]
Assets	386.2		462.9
Net sales
Net sales	151.4	202.0
Segment profit (loss)
Total segment profit	8.4	8.7
Corporate & Other [Member]
Segment Reporting Information [Line Items]
Assets	240.4		$ 167.4
Segment profit (loss)
Total segment profit	$ 12.1	$ 11.2