Revenue Recognition Revenue by Business Segment Geography (Details) - USD ($)	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
Disaggregation of Revenue [Line Items]
Revenues	$ 914,000,000.0	$ 1,055,000,000.0	$ 941,300,000	$ 723,800,000	$ 885,000,000.0	$ 1,032,900,000	$ 1,099,100,000	$ 790,300,000	$ 3,634,100,000	$ 3,807,200,000	$ 3,883,900,000
UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues									3,160,800,000	3,304,600,000	3,275,300,000
CANADA
Disaggregation of Revenue [Line Items]
Revenues									257,300,000	254,700,000	255,500,000
International [Member]
Disaggregation of Revenue [Line Items]
Revenues									216,000,000.0	247,900,000	353,100,000
Residential Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenues									2,361,500,000	2,291,100,000	2,225,000,000.0
Residential Heating and Cooling [Member] | Sales Channel, Directly to Consumer [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									0.75	0.75	0.76
Residential Heating and Cooling [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues									2,181,800,000	2,135,600,000	2,066,700,000
Residential Heating and Cooling [Member] | CANADA
Disaggregation of Revenue [Line Items]
Revenues									179,700,000	155,500,000	158,300,000
Residential Heating and Cooling [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues									0	0	0
Commercial Heating and Cooling [Member]
Disaggregation of Revenue [Line Items]
Revenues									800,900,000	947,400,000	900,700,000
Revenue from Contract with Customer, Excluding Assessed Tax									0.85	0.86	0.86
Commercial Heating and Cooling [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues									721,100,000	847,100,000	805,400,000
Commercial Heating and Cooling [Member] | CANADA
Disaggregation of Revenue [Line Items]
Revenues									77,600,000	98,500,000	92,700,000
Commercial Heating and Cooling [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues									2,200,000	1,800,000	2,600,000
Refrigeration [Member]
Disaggregation of Revenue [Line Items]
Revenues									471,700,000	568,700,000	758,200,000
Refrigeration [Member] | UNITED STATES
Disaggregation of Revenue [Line Items]
Revenues									257,900,000	321,900,000	403,200,000
Refrigeration [Member] | CANADA
Disaggregation of Revenue [Line Items]
Revenues									0	700,000	4,500,000
Refrigeration [Member] | International [Member]
Disaggregation of Revenue [Line Items]
Revenues									213,800,000	246,100,000	350,500,000
Refrigeration [Member] | Service [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 0.01	$ 0.01	$ 0.01