SEGMENT INFORMATION (Details) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2026
USD ($)
|
Jun. 30, 2025
USD ($)
|
Jun. 30, 2026
USD ($)
numberOfSegments
|
Jun. 30, 2025
USD ($)
|
|
| Segment Reporting Information [Line Items] | ||||
| Number of reportable segments | numberOfSegments | 2 | |||
| Other Segment | ||||
| Segment Reporting Information [Line Items] | ||||
| Significant items reported in the other segment | $ 0.0 | $ 0.0 | ||
| Utility segment | ||||
| Segment Reporting Information [Line Items] | ||||
| Fuel and purchased power | $ 285.6 | $ 286.4 | 595.4 | 562.6 |
| Cost of natural gas sold | $ 34.7 | $ 39.9 | $ 206.5 | $ 163.3 |