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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Other (Details) - ARLP LTIP - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Other information |  |  |  |
Unit-based compensation expense | $ 2.4 | $ 1.7 | $ 6.8 | $ 3.8
Total unit-based obligation recorded | 13.4 |  | 13.4 |
Unrecognized compensation expense (in dollars) | $ 14.0 |  | $ 14.0 |
Weighted-average period for recognition of expense |  |  | 1 year 1 month 6 days |

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