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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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