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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Accrued probable future environmental expenditures	$ 122.5		$ 124.5
Expense related to environmental activities	2.0	$ 0.5
Insurance recoveries	0.6	$ 4.5
Calvert City
Schedule of Equity Method Investments [Line Items]
Accrued probable future environmental expenditures	$ 110.7

X

- Definition

Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

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The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

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- Definition

The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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