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 $ 14.9 $ 6.2
Long-term derivative assets 0.0 0.0
Total derivative assets $ 14.9 $ 6.2
Current derivative assets balance sheet location Other Other
Long-term derivative assets balance sheet location Other Other
Derivative liabilities    
Current derivative liabilities $ 11.7 $ 7.4
Long-term derivative liabilities 0.3 0.3
Total derivative liabilities $ 12.0 $ 7.7
Current derivative liabilities balance sheet location Other Other
Long-term derivative liabilities balance sheet location Other Other
Natural gas contracts    
Derivative assets    
Current derivative assets $ 2.6 $ 3.3
Derivative liabilities    
Current derivative liabilities 11.7 7.4
FTRs    
Derivative assets    
Current derivative assets 12.3 2.9
Derivative liabilities    
Current derivative liabilities $ 0.0 $ 0.0
Derivatives designated as hedging instruments    
Derivative instruments    
Number of derivative instruments | Instruments 0 0