Reportable Business Segments (Assets by Segment) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total assets	$ 1,891.5	$ 1,760.3	$ 1,677.4
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total assets	771.3	673.4	628.3
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Total assets	443.9	385.8	363.6
Refrigeration [Member]
Segment Reporting Information [Line Items]
Total assets	506.9	442.8	444.9
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Total assets	$ 169.4	$ 258.3	$ 240.6