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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Other (Details) - ARLP LTIP - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 24, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other information |  |  |  |
Unit-based compensation expense |  | $ 10.4 | $ 9.4 | $ 5.4
Total unit-based obligation recorded |  | 19.5 | $ 16.0 |
Unrecognized compensation expense (in dollars) |  | $ 10.0 |  |
Weighted-average period for recognition of expense |  | 1 year 4 months 24 days |  |
Additional grants authorized (in units) | 440,470 |  |  |

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