Reportable Business Segments (Capital Expenditures by Segment) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 78.5	$ 105.6	$ 95.2
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	44.0	59.2	45.2
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	5.9	11.3	12.5
Refrigeration [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	9.2	9.4	9.3
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Payments to Acquire Property, Plant, and Equipment	$ 19.4	$ 25.7	$ 28.2