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DERIVATIVE INSTRUMENTS (Tables) | 3 Months Ended
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Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of derivative assets and liabilities | The following table shows our derivative assets and derivative liabilities, along with their classification on our balance sheets.
|  | March 31, 2021 |  | December 31, 2020
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Other current |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 13.4 |  |  | $ | 3.6 |  |  | $ | 13.0 |  |  | $ | 12.9 |
FTRs |  | 0.9 |  |  | — |  |  | 2.4 |  |  | — |
Coal contracts |  | 2.4 |  |  | 0.1 |  |  | 1.6 |  |  | 0.8 |
Interest rate swaps |  | — |  |  | 5.1 |  |  | — |  |  | 6.8 |
Total other current (1) |  | 16.7 |  |  | 8.8 |  |  | 17.0 |  |  | 20.5 |
Other long-term |  |  |  |  |  |  |  |
Natural gas contracts |  | 0.5 |  |  | 0.5 |  |  | 0.7 |  |  | 1.2 |
Coal contracts |  | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.4 |
Total other long-term (1) |  | 0.7 |  |  | 0.7 |  |  | 0.9 |  |  | 1.6 |
Total |  | $ | 17.4 |  |  | $ | 9.5 |  |  | $ | 17.9 |  |  | $ | 22.1 |
(1)On our balance sheets, we classify derivative assets and liabilities as other current or other long-term based on the maturities of the underlying contracts.
Schedule of estimated notional sales volumes and realized gains (losses) | Our estimated notional sales volumes and realized gains (losses) were as follows:
|  | Three Months Ended March 31, 2021 |  | Three Months Ended March 31, 2020
(in millions) |  | Volumes |  | Gains (Losses) |  | Volumes |  | Gains (Losses)
Natural gas contracts |  | 59.8 Dth |  | $ | (7.5) |  |  | 58.4 Dth |  | $ | (24.7) |
FTRs |  | 8.4 MWh |  | 2.1 |  |  | 7.2 MWh |  | 1.4 |
Total |  |  |  | $ | (5.4) |  |  |  |  | $ | (23.3) |
Schedule of net derivative instruments | The following table shows derivative assets and derivative liabilities if derivative instruments by counterparty were presented net on our balance sheets:
|  | March 31, 2021 |  | December 31, 2020
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities |
Gross amount recognized on the balance sheet |  | $ | 17.4 |  |  | $ | 9.5 |  |  | $ | 17.9 |  |  | $ | 22.1 |  |
Gross amount not offset on the balance sheet |  | (3.1) |  |  | (3.1) |  |  | (6.9) |  |  | (7.7) |  | (1)
Net amount |  | $ | 14.3 |  |  | $ | 6.4 |  |  | $ | 11.0 |  |  | $ | 14.4 |  |
(1)Includes cash collateral posted of $0.8 million.
Schedule of cash flow hedges recorded in other comprehensive income (loss) and earnings | The table below shows the amounts related to these cash flow hedges recorded in other comprehensive income (loss) and in earnings, along with our total interest expense on the income statements:
|  |  |  | Three Months Ended March 31
(in millions) |  |  |  |  |  | 2021 |  | 2020
Derivative loss recognized in other comprehensive loss |  |  |  |  |  | $ | — |  |  | $ | (4.7) |
Net derivative loss reclassified from accumulated other comprehensive loss to interest expense |  |  |  |  |  | (1.4) |  |  | (0.1) |
Total interest expense line item on the income statements |  |  |  |  |  | 119.5 |  |  | 129.4 |

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