Reportable Business Segments (Assets by Segment) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total assets	$ 2,034.9	$ 1,817.2	$ 1,891.5
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total assets	1,055.7	837.4	771.3
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total assets	409.0	349.5	324.3
Refrigeration [Member]
Segment Reporting Information [Line Items]
Total assets	393.3	462.9	626.5
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 176.9	$ 167.4	$ 169.4