v3.26.1
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