Reportable Business Segments (Capital Expenditures 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] | ||||
| Payments to Acquire Property, Plant, and Equipment | $ 33.2 | $ 35.6 | $ 124.4 | $ 89.6 |
| Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Payments to Acquire Property, Plant, and Equipment | 18.0 | 29.2 | 67.1 | 64.9 |
| Corporate and Other | ||||
| Segment Reporting Information [Line Items] | ||||
| Payments to Acquire Property, Plant, and Equipment | 15.2 | 6.4 | 57.3 | 24.7 |
| Residential Heating and Cooling [Member] | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Payments to Acquire Property, Plant, and Equipment | 9.3 | 7.2 | 34.5 | 30.4 |
| Commercial Heating and Cooling | Operating Segments | ||||
| Segment Reporting Information [Line Items] | ||||
| Payments to Acquire Property, Plant, and Equipment | $ 8.7 | $ 22.0 | $ 32.6 | $ 34.5 |