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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2023
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, 2023 |  | December 31, 2022
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
Current |  |  |  |  |  |  |  |
Natural gas contracts |  | $ | 10.4 |  |  | $ | 78.1 |  |  | $ | 32.5 |  |  | $ | 88.2 |
FTRs and TCRs |  | 7.2 |  |  | — |  |  | 7.8 |  |  | — |
Coal contracts |  | 0.3 |  |  | 10.9 |  |  | 18.9 |  |  | — |
Total current |  | 17.9 |  |  | 89.0 |  |  | 59.2 |  |  | 88.2 |
Long-term |  |  |  |  |  |  |  |
Natural gas contracts |  | 0.1 |  |  | 8.0 |  |  | — |  |  | 8.4 |
Coal contracts |  | — |  |  | 9.4 |  |  | 15.6 |  |  | — |
Total long-term |  | 0.1 |  |  | 17.4 |  |  | 15.6 |  |  | 8.4 |
Total |  | $ | 18.0 |  |  | $ | 106.4 |  |  | $ | 74.8 |  |  | $ | 96.6 |
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, 2023 |  | December 31, 2022 |  | December 31, 2021
(in millions) |  | Volumes |  | Gains (Losses) |  | Volumes |  | Gains |  | Volumes |  | Gains
Natural gas contracts |  | 198.0 Dth |  | $ | (259.1) |  |  | 183.3 Dth |  | $ | 299.5 |  |  | 197.6 Dth |  | $ | 136.5 |
FTRs and TCRs |  | 30.2 MWh |  | 25.9 |  |  | 27.2 MWh |  | 11.8 |  |  | 28.2 MWh |  | 17.7 |
Total |  |  |  | $ | (233.2) |  |  |  |  | $ | 311.3 |  |  |  |  | $ | 154.2 |
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, 2023 |  | December 31, 2022 |
(in millions) |  | Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities |
Gross amount recognized on the balance sheet |  | $ | 18.0 |  |  | $ | 106.4 |  |  | $ | 74.8 |  |  | $ | 96.6 |  |
Gross amount not offset on the balance sheet |  | (3.1) |  |  | (71.0) |  | (1) | (17.5) |  |  | (82.5) |  | (2)
Net amount |  | $ | 14.9 |  |  | $ | 35.4 |  |  | $ | 57.3 |  |  | $ | 14.1 |  |
(1) Includes cash collateral posted of $67.9 million. (2) Includes cash collateral posted of $65.0 million.

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B + Details
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- Definition Tabular disclosure of the amount of the realized gain (loss) and notional volumes for derivative instruments not designated as hedging instruments. + References No definition available. + Details
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