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COMPENSATION PLANS - LTIP Other Information (Details) - ARLP LTIP - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2020
Other information
Unit-based compensation expense	$ 1.6	$ 2.7	$ 2.5	$ 7.9
Reversal of cumulative previously recognized expenses			4.8
Total unit-based obligation recorded	11.3		$ 11.3
Units expected to vest (in units)			1,439,790
Units expected to vest (in dollars per units)			$ 13.33
Intrinsic value of unvested units	$ 4.0		$ 4.0
Intrinsic value of unvested per units	$ 2.77		$ 2.77
Unrecognized compensation expense (in dollars)	$ 7.9		$ 7.9
Weighted-average period for recognition of expense			1 year 7 months 6 days
Units available for grant	1,700,000		1,700,000		1,000,000.0

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Amount of partnership capital allocated for share-based obligations.

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- Definition

The number of equity-based payment instruments that are expected to vest.

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- Definition

The weighted average fair value of equity-based award plan units, which are expected to vest.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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Per share or unit weighted-average intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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