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Reportable Business Segments (Equity Method Investments) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Total income from equity method investments | $ 15.6 | $ 13.4 | $ 12.0
Commercial Heating and Cooling [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total income from equity method investments | (2.3) | (1.7) | (1.4)
Residential Heating and Cooling [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total income from equity method investments | (11.4) | (8.8) | (8.5)
Corporate and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total income from equity method investments | $ (1.9) | $ (2.9) | $ (2.1)

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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