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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Other (Details) - ARLP LTIP - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Other information
Unit-based compensation expense	$ 2.3	$ 0.7
Total unit-based obligation recorded	9.0
Unrecognized compensation expense (in dollars)	$ 17.6
Weighted-average period for recognition of expense	1 year 7 months 6 days

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+ References

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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