Reportable Business Segments (Depreciation and Amortization Expense by Segment) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Segment Reporting Information [Line Items] | ||||
| Total depreciation and amortization | $ 32.6 | $ 26.8 | $ 61.8 | $ 52.4 |
| Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Total depreciation and amortization | 25.3 | 19.5 | 47.7 | 37.8 |
| Corporate and Other | ||||
| Segment Reporting Information [Line Items] | ||||
| Total depreciation and amortization | 7.3 | 7.3 | 14.1 | 14.6 |
| Residential Heating and Cooling [Member] | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Total depreciation and amortization | 13.0 | 11.5 | 23.7 | 21.9 |
| Commercial Heating and Cooling | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Total depreciation and amortization | $ 12.3 | $ 8.0 | $ 24.0 | $ 15.9 |