Reportable Business Segments (Assets by Segment) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 1,817.2	$ 1,891.5	$ 1,760.3
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total assets	837.4	771.3	673.4
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total assets	457.2	443.9	385.8
Refrigeration [Member]
Segment Reporting Information [Line Items]
Total assets	355.2	506.9	442.8
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 167.4	$ 169.4	$ 258.3