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LONG-TERM DEBT - Surety Bonds, Letters of Credit and Guarantees (Details)
$ in Millions
Jun. 30, 2021
USD ($)
Surety bonds  
Debt Instrument [Line Items]  
Guarantees obligations $ 9.0
Commercial standby letters of credit  
Debt Instrument [Line Items]  
Guarantees obligations 33.2
Bank Guarantee  
Debt Instrument [Line Items]  
Guarantees obligations $ 0.2