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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of derivative assets and liabilities | None of the derivatives shown below were designated as hedging instruments.
|  | December 31, 2022 |  | December 31, 2021
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Current |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 32.5 |  |  | $ | 88.2 |  |  | $ | 60.6 |  |  | $ | 14.0 |
FTRs |  | 7.8 |  |  | — |  |  | 2.4 |  |  | — |
Coal contracts |  | 18.9 |  |  | — |  |  | 44.0 |  |  | — |
Total current |  | 59.2 |  |  | 88.2 |  |  | 107.0 |  |  | 14.0 |
Long-term |  |  |  |  |  |  |  |
Natural gas contracts |  | — |  |  | 8.4 |  |  | 4.0 |  |  | 1.1 |
Coal contracts |  | 15.6 |  |  | — |  |  | 9.0 |  |  | — |
Total long-term |  | 15.6 |  |  | 8.4 |  |  | 13.0 |  |  | 1.1 |
Total |  | $ | 74.8 |  |  | $ | 96.6 |  |  | $ | 120.0 |  |  | $ | 15.1 |
Schedule of estimated notional sales volumes and realized gains (losses) | Our estimated notional sales volumes and realized gains and losses were as follows for the years ended:
|  | December 31, 2022 |  | December 31, 2021 |  | December 31, 2020
(in millions) |  | Volumes |  | Gains |  | Volumes |  | Gains |  | Volumes |  | Gains (Losses)
Natural gas contracts |  | 183.3 Dth |  | $ | 299.5 |  |  | 197.6 Dth |  | $ | 136.5 |  |  | 188.6 Dth |  | $ | (54.1) |
FTRs and TCRs |  | 27.2 MWh |  | 11.8 |  |  | 28.2 MWh |  | 17.7 |  |  | 29.8 MWh |  | 4.1 |
Total |  |  |  | $ | 311.3 |  |  |  |  | $ | 154.2 |  |  |  |  | $ | (50.0) |
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, 2022 |  | December 31, 2021 |
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities |
Gross amount recognized on the balance sheet |  | $ | 74.8 |  |  | $ | 96.6 |  |  | $ | 120.0 |  |  | $ | 15.1 |  |
Gross amount not offset on the balance sheet |  | (17.5) |  |  | (82.5) |  | (1) | (15.2) |  | (2) | (9.2) |  | (3)
Net amount |  | $ | 57.3 |  |  | $ | 14.1 |  |  | $ | 104.8 |  |  | $ | 5.9 |  |
(1) Includes cash collateral posted of $65.0 million. (2) Includes cash collateral received of $6.4 million. (3) Includes cash collateral posted of $0.4 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, for the years ended December 31:
(in millions) |  | 2022 |  | 2021 |  | 2020
Derivative gain (loss) recognized in other comprehensive income / loss |  | $ | — |  |  | $ | 0.8 |  |  | $ | (5.9) |
Net derivative gain (loss) reclassified from accumulated other comprehensive loss to interest expense |  | 0.4 |  |  | (1.3) |  |  | (2.1) |
Total interest expense line item on the income statements |  | 515.1 |  |  | 471.1 |  |  | 493.7 |

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