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DERIVATIVE INSTRUMENTS - DERIVATIVE ASSETS AND LIABILITIES (Details) $ in Millions | Sep. 30, 2024 USD ($) Instruments | Dec. 31, 2023 USD ($) Instruments
--- | --- | ---
Derivative assets |  |
Current derivative assets | $ 29.5 | $ 17.9
Long-term derivative assets | 0.8 | 0.1
Total derivative assets | $ 30.3 | $ 18.0
Current derivative assets balance sheet location | Other | Other
Long-term derivative assets balance sheet location | Other Assets, Noncurrent | Other Assets, Noncurrent
Derivative liabilities |  |
Current derivative liabilities | $ 41.3 | $ 89.0
Long-term derivative liabilities | 2.5 | 17.4
Derivative liabilities | $ 43.8 | $ 106.4
Current derivative liabilities balance sheet location | Other Liabilities, Current | Other Liabilities, Current
Long-term derivative liabilities balance sheet location | Other noncurrent liabilities | Other noncurrent liabilities
Natural gas contracts |  |
Derivative assets |  |
Current derivative assets | $ 17.5 | $ 10.4
Long-term derivative assets | 0.8 | 0.1
Derivative liabilities |  |
Current derivative liabilities | 41.3 | 78.1
Long-term derivative liabilities | 2.5 | 8.0
FTRs and TCRs |  |
Derivative assets |  |
Current derivative assets | 12.0 | 7.2
Derivative liabilities |  |
Current derivative liabilities | 0.0 | 0.0
Coal contracts |  |
Derivative assets |  |
Current derivative assets | 0.0 | 0.3
Long-term derivative assets | 0.0 | 0.0
Derivative liabilities |  |
Current derivative liabilities | 0.0 | 10.9
Long-term derivative liabilities | $ 0.0 | $ 9.4
Designated as hedging instrument |  |
Derivative instruments |  |
Number of derivative instruments | Instruments | 0 | 0

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