Restructuring Charges (Restructuring Charges for Ongoing Activities) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Incurred in 2020	$ 10.8
Aggregate Incurred Through 12/31/2020	15.4
Total Expected to be Incurred	16.6
Restructuring Charges	10.8	$ 10.3	$ 3.0
Residential Heating and Cooling [Member]
Restructuring Cost and Reserve [Line Items]
Incurred in 2020	6.5
Aggregate Incurred Through 12/31/2020	9.4
Total Expected to be Incurred	9.4
Commercial Heating and Cooling [Member]
Restructuring Cost and Reserve [Line Items]
Incurred in 2020	1.6
Aggregate Incurred Through 12/31/2020	3.3
Total Expected to be Incurred	3.8
Refrigeration [Member]
Restructuring Cost and Reserve [Line Items]
Incurred in 2020	1.5
Aggregate Incurred Through 12/31/2020	1.5
Total Expected to be Incurred	2.2
Corporate and Other [Member]
Restructuring Cost and Reserve [Line Items]
Incurred in 2020	1.2
Aggregate Incurred Through 12/31/2020	1.2
Total Expected to be Incurred	1.2
Severance and Related Expense [Member]
Restructuring Cost and Reserve [Line Items]
Incurred in 2020	4.9
Aggregate Incurred Through 12/31/2020	6.2
Total Expected to be Incurred	6.9
Asset Write-offs and Accelerated Depreciation [Member]
Restructuring Cost and Reserve [Line Items]
Incurred in 2020	2.0
Aggregate Incurred Through 12/31/2020	3.6
Total Expected to be Incurred	3.6
Lease Termination [Member]
Restructuring Cost and Reserve [Line Items]
Incurred in 2020	(0.1)
Aggregate Incurred Through 12/31/2020	1.0
Total Expected to be Incurred	1.0
Other [Member]
Restructuring Cost and Reserve [Line Items]
Incurred in 2020	4.0
Aggregate Incurred Through 12/31/2020	4.6
Total Expected to be Incurred	$ 5.1