Reportable Business Segments (Geographic Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 914.0	$ 1,055.0	$ 941.3	$ 723.8	$ 885.0	$ 1,032.9	$ 1,099.1	$ 790.3	$ 3,634.1	$ 3,807.2	$ 3,883.9
Total property, plant and equipment, net	464.3				445.4				464.3	445.4	408.3
United States [Member]
Segment Reporting Information [Line Items]
Revenues									3,160.8	3,304.6	3,275.3
Total property, plant and equipment, net	352.9				333.6				352.9	333.6	293.3
Mexico [Member]
Segment Reporting Information [Line Items]
Total property, plant and equipment, net	79.2				82.0				79.2	82.0	86.7
Canada [Member]
Segment Reporting Information [Line Items]
Revenues									257.3	254.7	255.5
Total property, plant and equipment, net	2.2				2.2				2.2	2.2	1.7
International [Member]
Segment Reporting Information [Line Items]
Revenues									216.0	247.9	353.1
Total property, plant and equipment, net	$ 30.0				$ 27.6				30.0	27.6	26.6
Residential Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Revenues									2,361.5	2,291.1	2,225.0
Residential Heating and Cooling [Member] | United States [Member]
Segment Reporting Information [Line Items]
Revenues									2,181.8	2,135.6	2,066.7
Residential Heating and Cooling [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Revenues									179.7	155.5	158.3
Residential Heating and Cooling [Member] | International [Member]
Segment Reporting Information [Line Items]
Revenues									0.0	0.0	0.0
Commercial Heating and Cooling [Member]
Segment Reporting Information [Line Items]
Revenues									800.9	947.4	900.7
Commercial Heating and Cooling [Member] | United States [Member]
Segment Reporting Information [Line Items]
Revenues									721.1	847.1	805.4
Commercial Heating and Cooling [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Revenues									77.6	98.5	92.7
Commercial Heating and Cooling [Member] | International [Member]
Segment Reporting Information [Line Items]
Revenues									2.2	1.8	2.6
Refrigeration [Member]
Segment Reporting Information [Line Items]
Revenues									471.7	568.7	758.2
Refrigeration [Member] | United States [Member]
Segment Reporting Information [Line Items]
Revenues									257.9	321.9	403.2
Refrigeration [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Revenues									0.0	0.7	4.5
Refrigeration [Member] | International [Member]
Segment Reporting Information [Line Items]
Revenues									$ 213.8	$ 246.1	$ 350.5