v3.26.1
DERIVATIVE INSTRUMENTS - DERIVATIVE ASSETS AND LIABILITIES (Details)
$ in Millions
Jun. 30, 2026
USD ($)
Instruments
Dec. 31, 2025
USD ($)
Instruments
Derivative assets    
Current derivative assets $ 17.0 $ 7.9
Long-term derivative assets 0.0 0.0
Total derivative assets $ 17.0 $ 7.9
Current derivative assets balance sheet location Other Other
Long-term derivative assets balance sheet location Other Other
Derivative liabilities    
Current derivative liabilities $ 6.5 $ 3.8
Long-term derivative liabilities 0.1 0.2
Total derivative liabilities $ 6.6 $ 4.0
Current derivative liability balance sheet location Other Other
Long-term derivative liabilities balance sheet location Other Other
Natural gas contracts    
Derivative assets    
Current derivative assets $ 6.8 $ 5.6
Derivative liabilities    
Current derivative liabilities 6.5 3.8
FTRs    
Derivative assets    
Current derivative assets 10.2 2.3
Derivative liabilities    
Current derivative liabilities $ 0.0 $ 0.0
Derivatives designated as hedging instruments    
Derivative instruments    
Number of derivative instruments | Instruments 0 0