Reportable Business Segments (Depreciation and Amortization Expense by Segment) (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Segment Reporting Information [Line Items] | ||||
| Total depreciation and amortization | $ 34.6 | $ 27.0 | $ 96.4 | $ 79.4 |
| Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Total depreciation and amortization | 27.1 | 20.1 | 74.9 | 57.9 |
| Corporate and Other | ||||
| Segment Reporting Information [Line Items] | ||||
| Total depreciation and amortization | 7.5 | 6.9 | 21.5 | 21.5 |
| Residential Heating and Cooling [Member] | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Total depreciation and amortization | 14.4 | 11.5 | 38.3 | 33.4 |
| Commercial Heating and Cooling | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Total depreciation and amortization | $ 12.7 | $ 8.6 | $ 36.6 | $ 24.5 |