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DERIVATIVE INSTRUMENTS - DERIVATIVE ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative assets |  |
Current derivative assets | $ 247.1 | $ 17.0
Long-term derivative assets | 23.0 | 0.9
Total derivative assets | 270.1 | 17.9
Derivative liabilities |  |
Current derivative liabilities | 22.3 | 20.5
Long-term derivative liabilities | 0.0 | 1.6
Total derivative liabilities | 22.3 | 22.1
Natural gas contracts |  |
Derivative assets |  |
Current derivative assets | 204.7 | 13.0
Long-term derivative assets | 17.5 | 0.7
Derivative liabilities |  |
Current derivative liabilities | 20.6 | 12.9
Long-term derivative liabilities | 0.0 | 1.2
FTRs |  |
Derivative assets |  |
Current derivative assets | 3.7 | 2.4
Derivative liabilities |  |
Current derivative liabilities | 0.0 | 0.0
Coal contracts |  |
Derivative assets |  |
Current derivative assets | 38.7 | 1.6
Long-term derivative assets | 5.5 | 0.2
Derivative liabilities |  |
Current derivative liabilities | 0.0 | 0.8
Long-term derivative liabilities | 0.0 | 0.4
Interest rate swaps |  |
Derivative assets |  |
Current derivative assets | 0.0 | 0.0
Derivative liabilities |  |
Current derivative liabilities | $ 1.7 | $ 6.8

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