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Derivative Instruments - Derivative Assets and Liabilities (Details) $ in Millions | Dec. 31, 2023 USD ($) Instruments | Dec. 31, 2022 USD ($) Instruments
--- | --- | ---
Derivative assets |  |
Current derivative assets | $ 17.9 | $ 59.2
Long-term derivative assets | 0.1 | 15.6
Total derivative assets | $ 18.0 | $ 74.8
Current derivative assets balance sheet location | Other | Other
Long-term derivative assets balance sheet location | Other | Other
Derivative liabilities |  |
Current derivative liabilities | $ 89.0 | $ 88.2
Long-term derivative Iiabilities | 17.4 | 8.4
Total derivative liabilities | $ 106.4 | $ 96.6
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 | $ 10.4 | $ 32.5
Long-term derivative assets | 0.1 | 0.0
Derivative liabilities |  |
Current derivative liabilities | 78.1 | 88.2
Long-term derivative Iiabilities | 8.0 | 8.4
FTRs and TCRs |  |
Derivative assets |  |
Current derivative assets | 7.2 | 7.8
Derivative liabilities |  |
Current derivative liabilities | 0.0 | 0.0
Coal contracts |  |
Derivative assets |  |
Current derivative assets | 0.3 | 18.9
Long-term derivative assets | 0.0 | 15.6
Derivative liabilities |  |
Current derivative liabilities | 10.9 | 0.0
Long-term derivative Iiabilities | $ 9.4 | $ 0.0
Hedging instruments |  |
Derivative instruments |  |
Number of derivatives designated as hedging instruments | Instruments | 0 | 0

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