Reportable Business Segments (Assets by Segment) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total assets	$ 2,171.9	$ 2,032.5	$ 2,034.9
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total assets	1,149.7	1,034.6	1,055.7
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total assets	366.2	366.5	409.0
Refrigeration [Member]
Segment Reporting Information [Line Items]
Total assets	426.6	387.9	393.3
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 229.4	$ 243.5	$ 176.9