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Derivative Instruments - Derivative Assets and Liabilities (Details) $ in Millions | Dec. 31, 2022 USD ($) Instruments | Dec. 31, 2021 USD ($) Instruments
--- | --- | ---
Derivative assets |  |
Other current derivative assets | $ 59.2 | $ 107.0
Other long-term derivative assets | 15.6 | 13.0
Derivative assets | $ 74.8 | $ 120.0
Current derivative assets balance sheet location | Other | Other
Long-term derivative assets balance sheet location | Other | Other
Derivative liabilities |  |
Other current derivative liabilities | $ 88.2 | $ 14.0
Other long-term derivative Iiabilities | 8.4 | 1.1
Derivative liabilities | $ 96.6 | $ 15.1
Current derivative liabilities balance sheet location | Other | Other
Long-term derivative liabilities balance sheet location | Other | Other
Natural gas contracts |  |
Derivative assets |  |
Other current derivative assets | $ 32.5 | $ 60.6
Other long-term derivative assets | 0.0 | 4.0
Derivative liabilities |  |
Other current derivative liabilities | 88.2 | 14.0
Other long-term derivative Iiabilities | 8.4 | 1.1
FTRs |  |
Derivative assets |  |
Other current derivative assets | 7.8 | 2.4
Derivative liabilities |  |
Other current derivative liabilities | 0.0 | 0.0
Coal contracts |  |
Derivative assets |  |
Other current derivative assets | 18.9 | 44.0
Other long-term derivative assets | 15.6 | 9.0
Derivative liabilities |  |
Other current derivative liabilities | 0.0 | 0.0
Other long-term derivative Iiabilities | $ 0.0 | $ 0.0
Hedging instruments |  |
Derivative instruments |  |
Number of derivatives designated as hedging instruments | Instruments | 0 | 0

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