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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2019
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. 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.
|  | December 31, 2019 |  | December 31, 2018
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Other current |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 3.4 |  |  | $ | 21.8 |  |  | $ | 7.7 |  |  | $ | 5.3 |
FTRs |  | 3.1 |  |  | — |  |  | 7.4 |  |  | — |
Coal contracts |  | 0.2 |  |  | 0.2 |  |  | 0.2 |  |  | 0.1 |
Interest rate swaps |  | — |  |  | 2.8 |  |  | — |  |  | 0.4 |
Total other current |  | 6.7 |  |  | 24.8 |  |  | 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 |  | — |  |  | 3.2 |  |  | — |  |  | 1.9 |
Total other long-term |  | 0.2 |  |  | 4.1 |  |  | 0.6 |  |  | 2.1 |
Total |  | $ | 6.9 |  |  | $ | 28.9 |  |  | $ | 15.9 |  |  | $ | 7.9 |
Schedule of estimated notional sales volumes and realized gains (losses) | Our estimated notional sales volumes and realized gains (losses) were as follows for the years ended:
|  | December 31, 2019 |  | December 31, 2018 |  | December 31, 2017
(in millions) |  | Volumes |  | Gains (Losses) |  | Volumes |  | Gains |  | Volumes |  | Gains (Losses)
Natural gas contracts |  | 183.9 Dth |  | $ | (27.1 | ) |  | 173.2 Dth |  | $ | 24.6 |  |  | 123.1 Dth |  | $ | (8.0 | )
Petroleum products contracts |  | — gallons |  | — |  |  | 6.0 gallons |  | 1.6 |  |  | 18.0 gallons |  | (1.3 | )
FTRs |  | 31.2 MWh |  | 16.3 |  |  | 30.5 MWh |  | 15.9 |  |  | 36.2 MWh |  | 14.0 |
Total |  |  |  | $ | (10.8 | ) |  |  |  | $ | 42.1 |  |  |  |  | $ | 4.7 |
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:
|  | December 31, 2019 |  | December 31, 2018 |
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities |
Gross amount recognized on the balance sheet |  | $ | 6.9 |  |  | $ | 28.9 |  |  | $ | 15.9 |  |  | $ | 7.9 |  |
Gross amount not offset on the balance sheet |  | (1.4 | ) |  | (21.4 | ) | (1) | (4.0 | ) | (2) | (4.9 | ) | (3)
Net amount |  | $ | 5.5 |  |  | $ | 7.5 |  |  | $ | 11.9 |  |  | $ | 3.0 |  |
(1) | Includes cash collateral posted of $20.0 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, for the years ended December 31:
(in millions) |  | 2019 |  | 2018 |  | 2017
Derivative losses recognized in other comprehensive loss |  | $ | (4.8 | ) |  | $ | (2.9 | ) |  | $ | — |
Net derivative gains reclassified from accumulated other comprehensive loss to interest expense |  | 1.1 |  |  | 1.6 |  |  | 2.2 |
Total interest expense line item on the income statements |  | 501.5 |  |  | 445.1 |  |  | 415.7 |

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