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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivative assets and liabilities | None 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:
|  | December 31, 2018 |  | December 31, 2017
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Other current |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 7.7 |  |  | $ | 5.3 |  |  | $ | 5.6 |  |  | $ | 9.4 |
Petroleum products contracts |  | — |  |  | — |  |  | 1.2 |  |  | — |
FTRs |  | 7.4 |  |  | — |  |  | 4.4 |  |  | — |
Coal contracts |  | 0.2 |  |  | 0.1 |  |  | 0.6 |  |  | 0.6 |
Interest rate swaps |  | — |  |  | 0.4 |  |  | — |  |  | — |
Total other current |  | $ | 15.3 |  |  | $ | 5.8 |  |  | $ | 11.8 |  |  | $ | 10.0 |
Other long-term |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 0.4 |  |  | $ | 0.2 |  |  | $ | 0.1 |  |  | $ | 1.4 |
Coal contracts |  | 0.2 |  |  | — |  |  | 0.5 |  |  | 0.2 |
Interest rate swaps |  | — |  |  | 1.9 |  |  | — |  |  | — |
Total other long-term |  | $ | 0.6 |  |  | $ | 2.1 |  |  | $ | 0.6 |  |  | $ | 1.6 |
Total |  | $ | 15.9 |  |  | $ | 7.9 |  |  | $ | 12.4 |  |  | $ | 11.6 |
Estimated notional volumes and realized gain (losses) | Our estimated notional sales volumes and realized gains (losses) were as follows for the years ended:
|  | December 31, 2018 |  | December 31, 2017 |  | December 31, 2016
(in millions) |  | Volume |  | Gains |  | Volume |  | Gains (Losses) |  | Volume |  | Gains (losses)
Natural gas contracts |  | 173.2 Dth |  | $ | 24.6 |  |  | 123.1 Dth |  | $ | (8.0 | ) |  | 151.1 Dth |  | $ | (59.6 | )
Petroleum products contracts |  | 6.0 gallons |  | 1.6 |  |  | 18.0 gallons |  | (1.3 | ) |  | 14.7 gallons |  | (3.2 | )
FTRs |  | 30.5 MWh |  | 15.9 |  |  | 36.2 MWh |  | 14.0 |  |  | 33.7 MWh |  | 13.3 |
Total |  |  |  | $ | 42.1 |  |  |  |  | $ | 4.7 |  |  |  |  | $ | (49.5 | )
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:
|  | December 31, 2018 |  | December 31, 2017 |
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities |
Gross amount recognized on the balance sheet |  | $ | 15.9 |  |  | $ | 7.9 |  |  | $ | 12.4 |  |  | $ | 11.6 |  |
Gross amount not offset on the balance sheet |  | (4.0 | ) | (1) | (4.9 | ) | (2) | (4.9 | ) |  | (9.0 | ) | (3)
Net amount |  | $ | 11.9 |  |  | $ | 3.0 |  |  | $ | 7.5 |  |  | $ | 2.6 |  |
(1) | Includes cash collateral received of $0.2 million.
(2) | Includes cash collateral posted of $1.1 million.
(3) | Includes cash collateral posted of $4.1 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 at December 31:
(in millions) |  | 2018 |  | 2017 |  | 2016
Amount of net derivative loss recognized in OCI |  | $ | (2.9 | ) |  | $ | — |  |  | $ | — |
Amount of net derivative gain reclassified from accumulated OCI to interest expense |  | 1.6 |  |  | 2.2 |  |  | 2.2 |

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