v3.26.3
DERIVATIVE INSTRUMENTS - DERIVATIVE ASSETS AND LIABILITIES (Details)
$ in Millions
Sep. 30, 2026
USD ($)
Instruments
Dec. 31, 2025
USD ($)
Instruments
Derivative assets    
Current derivative assets $ 11.6 $ 7.9
Long-term derivative assets 0.0 0.0
Total derivative assets $ 11.6 $ 7.9
Current derivative assets balance sheet location Other Other
Long-term derivative assets balance sheet location Other Other
Derivative liabilities    
Current derivative liabilities $ 9.6 $ 3.8
Long-term derivative liabilities 0.2 0.2
Total derivative liabilities $ 9.8 $ 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 $ 4.8 $ 5.6
Derivative liabilities    
Current derivative liabilities 9.6 3.8
FTRs    
Derivative assets    
Current derivative assets 6.8 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