v3.26.3
SEGMENT INFORMATION (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
numberOfSegments
Sep. 30, 2025
USD ($)
Segment Reporting [Line Items]        
Number of reportable segments | numberOfSegments     2  
Other Segment        
Segment Reporting [Line Items]        
Significant items reported in the other segment     $ 0.0 $ 0.0
Utility segment        
Segment Reporting [Line Items]        
Fuel and purchased power $ 437.0 $ 378.4 1,032.4 941.0
Cost of natural gas sold $ 16.5 $ 22.8 $ 223.0 $ 186.1