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DERIVATIVE INSTRUMENTS - DERIVATIVE ASSETS AND LIABILITIES (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative Asset |  |
Other current derivative assets | $ 15.5 | $ 15.3
Other long-term derivative assets | 0.3 | 0.6
Derivative asset | 15.8 | 15.9
Derivative Liability |  |
Other current derivative liabilities | 24.5 | 5.8
Other long-term derivative liabilities | 6.6 | 2.1
Derivative liability | 31.1 | 7.9
Natural gas contracts |  |
Derivative Asset |  |
Other current derivative assets | 4.6 | 7.7
Other long-term derivative assets | 0.0 | 0.4
Derivative Liability |  |
Other current derivative liabilities | 22.5 | 5.3
Other long-term derivative liabilities | 1.8 | 0.2
FTRs |  |
Derivative Asset |  |
Other current derivative assets | 10.4 | 7.4
Derivative Liability |  |
Other current derivative liabilities | 0.0 | 0.0
Coal contracts |  |
Derivative Asset |  |
Other current derivative assets | 0.5 | 0.2
Other long-term derivative assets | 0.3 | 0.2
Derivative Liability |  |
Other current derivative liabilities | 0.1 | 0.1
Other long-term derivative liabilities | 0.0 | 0.0
Interest rate swaps |  |
Derivative Asset |  |
Other current derivative assets | 0.0 | 0.0
Other long-term derivative assets | 0.0 | 0.0
Derivative Liability |  |
Other current derivative liabilities | 1.9 | 0.4
Other long-term derivative liabilities | $ 4.8 | $ 1.9

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