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DERIVATIVE INSTRUMENTS (Tables) | 9 Months Ended
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Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of derivative assets and liabilities | The following table shows our derivative assets and derivative liabilities:
|  | September 30, 2019 |  | December 31, 2018
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Other current |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 8.9 |  |  | $ | 22.3 |  |  | $ | 7.7 |  |  | $ | 5.3 |
FTRs |  | 6.2 |  |  | — |  |  | 7.4 |  |  | — |
Coal contracts |  | 0.3 |  |  | 0.1 |  |  | 0.2 |  |  | 0.1 |
Interest rate swaps |  | — |  |  | 2.5 |  |  | — |  |  | 0.4 |
Total other current * |  | 15.4 |  |  | 24.9 |  |  | 15.3 |  |  | 5.8 |
Other long-term |  |  |  |  |  |  |  |
Natural gas contracts |  | — |  |  | 2.2 |  |  | 0.4 |  |  | 0.2 |
Coal contracts |  | 0.3 |  |  | 0.1 |  |  | 0.2 |  |  | — |
Interest rate swaps |  | — |  |  | 4.4 |  |  | — |  |  | 1.9 |
Total other long-term * |  | 0.3 |  |  | 6.7 |  |  | 0.6 |  |  | 2.1 |
Total |  | $ | 15.7 |  |  | $ | 31.6 |  |  | $ | 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.
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 September 30, 2019 |  | Three Months Ended September 30, 2018
(in millions) |  | Volumes |  | Gains (Losses) |  | Volumes |  | Gains
Natural gas contracts |  | 37.8 Dth |  | $ | (13.2 | ) |  | 36.7 Dth |  | $ | 0.4 |
Petroleum products contracts |  | — gallons |  | — |  |  | 1.3 gallons |  | 0.5 |
FTRs |  | 7.8 MWh |  | 7.6 |  |  | 7.9 MWh |  | 7.1 |
Total |  |  |  | $ | (5.6 | ) |  |  |  | $ | 8.0 |
|  | Nine Months Ended September 30, 2019 |  | Nine Months Ended September 30, 2018
(in millions) |  | Volumes |  | Gains (Losses) |  | Volumes |  | Gains (Losses)
Natural gas contracts |  | 137.7 Dth |  | $ | (16.8 | ) |  | 124.7 Dth |  | $ | (7.1 | )
Petroleum products contracts |  | — gallons |  | — |  |  | 5.1 gallons |  | 1.3 |
FTRs |  | 23.9 MWh |  | 12.9 |  |  | 22.9 MWh |  | 14.7 |
Total |  |  |  | $ | (3.9 | ) |  |  |  | $ | 8.9 |
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:
|  | September 30, 2019 |  | December 31, 2018
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Gross amount recognized on the balance sheet |  | $ | 15.7 |  |  | $ | 31.6 |  |  | $ | 15.9 |  |  | $ | 7.9 |  |
Gross amount not offset on the balance sheet |  | (5.7 | ) |  | (23.9 | ) | (1) | (4.0 | ) | (2) | (4.9 | ) | (3)
Net amount |  | $ | 10.0 |  |  | $ | 7.7 |  |  | $ | 11.9 |  |  | $ | 3.0 |  |
(1) | Includes cash collateral posted of $18.2 million.
(2) | Includes cash collateral received of $0.2 million.
(3) | Includes cash collateral posted of $1.1 million.
Schedule of cash flow hedges recorded in other comprehensive loss and earnings | The table below shows the amounts related to these cash flow hedges recorded in other comprehensive loss and in earnings, along with our total interest expense on the income statements:
|  | Three Months Ended September 30 |  | Nine Months Ended September 30
(in millions) |  | 2019 |  | 2018 |  | 2019 |  | 2018
Derivative (losses) gains recognized in other comprehensive loss |  | $ | (0.5 | ) |  | $ | 0.4 |  |  | $ | (5.3 | ) |  | $ | 0.4 |
Net derivative gains reclassified from accumulated other comprehensive loss to interest expense |  | 0.2 |  |  | 0.2 |  |  | 1.0 |  |  | 1.3 |
Total interest expense line item on the income statements |  | 125.8 |  |  | 112.0 |  |  | 374.3 |  |  | 327.2 |

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