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LONG-TERM DEBT - Surety Bonds and Letters of Credit (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Surety bonds  
Guarantor Obligations [Line Items]  
Outstanding surety bonds, commercial standby letters of credit and bank guarantees $ 9.1
Commercial standby letters of credit  
Guarantor Obligations [Line Items]  
Outstanding surety bonds, commercial standby letters of credit and bank guarantees $ 33.3