Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND CONTINGENCIES (Details)

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COMMITMENTS AND CONTINGENCIES (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
COMMITMENTS AND CONTINGENCIES    
Employee severance benefits $ 2.8 $ 2.8
Insurance expense 0.3 1.5
Cash collateral for letters of credit 0.4 0.4
Non-depleting cash collateral $ 0.6 $ 0.6