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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Other (Details) - ARLP LTIP - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Apr. 22, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Other information |  |  |
Unit-based compensation expense |  | $ 0.7 | $ (0.7)
Reversal of cumulative previously recognized expenses |  | 4.8 |
Total unit-based obligation recorded |  | 2.1 |
Unrecognized compensation expense (in dollars) |  | $ 5.1 |
Weighted-average period for recognition of expense |  | 1 year 9 months 18 days |
Additional grants authorized (in units) | 1,833,190 |  |
Granted (in units) | 1,818,190 |  |

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