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VARIABLE INTEREST ENTITIES - WKY CoalPlay (Details) - WKY CoalPlay $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Variable Interest Entities
Payments made	$ 10.8
Percentage of internal rate of return on purchase price, if leased reserves acquired	7.00%

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- Definition

Percentage of internal rate of return provided to the counterparty in the purchase price under the option to acquire the leased coal reserves.

+ References

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- Definition

Amount of transactions with related party during the financial reporting period.

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