Reportable Business Segments (Capital Expenditures 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] | ||||
| Payments to Acquire Property, Plant, and Equipment | $ 35.7 | $ 28.5 | $ 91.2 | $ 54.0 |
| Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Payments to Acquire Property, Plant, and Equipment | 26.5 | 18.0 | 49.1 | 35.7 |
| Corporate and Other | ||||
| Segment Reporting Information [Line Items] | ||||
| Payments to Acquire Property, Plant, and Equipment | 9.2 | 10.5 | 42.1 | 18.3 |
| Residential Heating and Cooling [Member] | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Payments to Acquire Property, Plant, and Equipment | 10.1 | 11.8 | 25.2 | 23.2 |
| Commercial Heating and Cooling | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Payments to Acquire Property, Plant, and Equipment | $ 16.4 | $ 6.2 | $ 23.9 | $ 12.5 |