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Derivative Instruments - Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative assets |  |
Other current derivative assets | $ 6.7 | $ 15.3
Other long-term derivative assets | 0.2 | 0.6
Derivative assets | 6.9 | 15.9
Derivative liabilities |  |
Other current derivative liabilities | 24.8 | 5.8
Other long-term derivative Iiabilities | 4.1 | 2.1
Derivative liabilities | 28.9 | 7.9
Natural gas contracts |  |
Derivative assets |  |
Other current derivative assets | 3.4 | 7.7
Other long-term derivative assets | 0.0 | 0.4
Derivative liabilities |  |
Other current derivative liabilities | 21.8 | 5.3
Other long-term derivative Iiabilities | 0.9 | 0.2
FTRs |  |
Derivative assets |  |
Other current derivative assets | 3.1 | 7.4
Derivative liabilities |  |
Other current derivative liabilities | 0.0 | 0.0
Coal contracts |  |
Derivative assets |  |
Other current derivative assets | 0.2 | 0.2
Other long-term derivative assets | 0.2 | 0.2
Derivative liabilities |  |
Other current derivative liabilities | 0.2 | 0.1
Other long-term derivative Iiabilities | 0.0 | 0.0
Interest rate swaps |  |
Derivative assets |  |
Other current derivative assets | 0.0 | 0.0
Other long-term derivative assets | 0.0 | 0.0
Derivative liabilities |  |
Other current derivative liabilities | 2.8 | 0.4
Other long-term derivative Iiabilities | $ 3.2 | $ 1.9

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