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DERIVATIVE INSTRUMENTS (Tables) | 3 Months Ended
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Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivative assets and derivative liabilities | of our derivatives are designated as hedging instruments, with the exception of our interest rate swaps, which have been designated as cash flow hedges. The following table shows our derivative assets and derivative liabilities:
|  | March 31, 2019 |  | December 31, 2018
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Other current |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 5.1 |  |  | $ | 0.9 |  |  | $ | 7.7 |  |  | $ | 5.3 |
FTRs |  | 3.1 |  |  | — |  |  | 7.4 |  |  | — |
Coal contracts |  | 1.0 |  |  | 0.1 |  |  | 0.2 |  |  | 0.1 |
Interest rate swaps |  | — |  |  | 0.7 |  |  | — |  |  | 0.4 |
Total other current * |  | $ | 9.2 |  |  | $ | 1.7 |  |  | $ | 15.3 |  |  | $ | 5.8 |
Other long-term |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 0.9 |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | 0.2 |
Coal contracts |  | 0.2 |  |  | — |  |  | 0.2 |  |  | — |
Interest rate swaps |  | — |  |  | 3.0 |  |  | — |  |  | 1.9 |
Total other long-term * |  | $ | 1.1 |  |  | $ | 3.0 |  |  | $ | 0.6 |  |  | $ | 2.1 |
Total |  | $ | 10.3 |  |  | $ | 4.7 |  |  | $ | 15.9 |  |  | $ | 7.9 |
* | 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.
Estimated notional volumes and realized gain (losses) | Our estimated notional sales volumes and realized gains (losses) were as follows:
|  | Three Months Ended March 31, 2019 |  | Three Months Ended March 31, 2018
(in millions) |  | Volumes |  | Gains (Losses) |  | Volumes |  | Gains (Losses)
Natural gas contracts |  | 56.1 Dth |  | $ | (0.5 | ) |  | 48.1 Dth |  | $ | (5.2 | )
Petroleum products contracts |  | — gallons |  | — |  |  | 2.1 gallons |  | 0.5 |
FTRs |  | 8.1 MWh |  | 2.3 |  |  | 8.2 MWh |  | 3.7 |
Total |  |  |  | $ | 1.8 |  |  |  |  | $ | (1.0 | )
Offsetting assets and liabilities | The following table shows derivative assets and derivative liabilities if derivative instruments by counterparty were presented net on our balance sheets:
|  | March 31, 2019 |  | December 31, 2018
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Gross amount recognized on the balance sheet |  | $ | 10.3 |  |  | $ | 4.7 |  |  | $ | 15.9 |  |  | $ | 7.9 |  |
Gross amount not offset on the balance sheet |  | (0.9 | ) |  | (0.9 | ) |  | (4.0 | ) | (1) | (4.9 | ) | (2)
Net amount |  | $ | 9.4 |  |  | $ | 3.8 |  |  | $ | 11.9 |  |  | $ | 3.0 |  |
(1) | Includes cash collateral received of $0.2 million.
(2) | Includes cash collateral posted of $1.1 million.
Amounts related to cash flow hedges recorded in OCI and earnings | The table below shows the amounts related to these cash flow hedges recorded in OCI and in earnings, along with our total interest expense on the income statements:
|  | Three Months Ended March 31
(in millions) |  | 2019 |  | 2018
Derivative losses recognized in OCI |  | $ | (1.6 | ) |  | $ | — |
Net derivative gains reclassified from accumulated OCI to interest expense |  | 0.4 |  |  | 0.6 |
Total interest expense line item on the income statements |  | 124.4 |  |  | 106.7 |

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