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Fair Value Measurements and Derivative Instruments - Fuel Price Risk (Details) - Fuel Swap Agreements $ in Millions | Mar. 31, 2023 USD ($) T | Dec. 31, 2022 USD ($) T
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Derivative Instruments |  |
Estimated unrealized net gain (loss) associated with cash flow hedges pertaining to fuel swap agreements expected to be reclassified to earnings from accumulated other comprehensive income loss | $ | $ 34.1 | $ 7.9
2023 |  |
Derivative Instruments |  |
Fuel Swap Agreements (metric tons) | 673,551 | 825,651
Percentage of projected requirements | 54.00% | 50.00%
2024 |  |
Derivative Instruments |  |
Fuel Swap Agreements (metric tons) | 176,450 | 0
Percentage of projected requirements | 10.00% | 0.00%

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- Definition The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need. + References No definition available. + Details
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