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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Other (Details) - ARLP LTIP - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Other information |  |  |  |
Unit-based compensation expense | $ 1.4 | $ 1.6 | $ 2.1 | $ 0.9
Reversal of cumulative previously recognized expenses |  |  | 4.8 |
Total unit-based obligation recorded | 3.5 |  | 3.5 |
Unrecognized compensation expense (in dollars) | $ 14.6 |  | $ 14.6 |
Weighted-average period for recognition of expense |  |  | 2 years 1 month 6 days |

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