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DERIVATIVE INSTRUMENTS - DERIVATIVE ASSETS AND LIABILITIES (Details)
$ in Millions
Jun. 30, 2023
USD ($)
Instruments
Dec. 31, 2022
USD ($)
Instruments
Derivative assets    
Current derivative assets $ 8.6 $ 23.7
Long-term derivative assets 0.1 15.1
Total derivative assets $ 8.7 $ 38.8
Current derivative assets balance sheet location Other Other
Long-term derivative assets balance sheet location Other Other
Derivative liabilities    
Current derivative liabilities $ 52.8 $ 28.8
Long-term derivative liabilities 11.8 1.2
Derivative liabilities $ 64.6 $ 30.0
Long-term derivative liabilities balance sheet location Other Other
Natural gas contracts    
Derivative assets    
Current derivative assets $ 1.6 $ 4.1
Long-term derivative assets 0.0 0.0
Derivative liabilities    
Current derivative liabilities 36.7 28.8
Long-term derivative liabilities 0.4 1.2
FTRs    
Derivative assets    
Current derivative assets 6.9 2.0
Derivative liabilities    
Current derivative liabilities 0.0 0.0
Coal contracts    
Derivative assets    
Current derivative assets 0.1 17.6
Long-term derivative assets 0.1 15.1
Derivative liabilities    
Current derivative liabilities 16.1 0.0
Long-term derivative liabilities $ 11.4 $ 0.0
Derivatives designated as hedging instruments    
Derivative instruments    
Number of derivative instruments | Instruments 0 0