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Reportable Business Segments (Equity Method Investments) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
Total income from equity method investments | $ 2.1 | $ 2.5 | $ 3.3 | $ 3.7
Residential Heating and Cooling [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total income from equity method investments | (1.7) | (1.7) | (2.4) | (2.6)
Commercial Heating and Cooling |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total income from equity method investments | (0.4) | (0.8) | (0.8) | (1.2)
Corporate & Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total income from equity method investments | $ 0.0 | $ 0.0 | $ (0.1) | $ 0.1

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