Restructuring Charges Restructuring charges (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	$ 0.5
Restructuring and Related Cost, Cost Incurred to Date	5.1
Restructuring and Related Cost, Expected Cost	5.8
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0.1
Restructuring and Related Cost, Cost Incurred to Date	1.4
Restructuring and Related Cost, Expected Cost	1.4
Reduced Depreciation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0.1
Restructuring and Related Cost, Cost Incurred to Date	1.7
Restructuring and Related Cost, Expected Cost	1.7
Contract Termination [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0.0
Restructuring and Related Cost, Cost Incurred to Date	1.1
Restructuring and Related Cost, Expected Cost	1.1
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0.3
Restructuring and Related Cost, Cost Incurred to Date	0.9
Restructuring and Related Cost, Expected Cost	1.6
Commercial Heating and Cooling [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0.3
Restructuring and Related Cost, Cost Incurred to Date	2.0
Restructuring and Related Cost, Expected Cost	2.7
Residential Heating and Cooling [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0.2
Restructuring and Related Cost, Cost Incurred to Date	3.1
Restructuring and Related Cost, Expected Cost	$ 3.1