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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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