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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other information
Unit-based compensation expense	$ 1.7	$ 1.6	$ 3.8	$ 2.5
Reversal of cumulative previously recognized expenses				$ 4.8
Total unit-based obligation recorded	5.1		5.1
Unrecognized compensation expense (in dollars)	$ 12.6		$ 12.6
Weighted-average period for recognition of expense			1 year 9 months 18 days

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