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RELATED PARTY TRANSACTIONS - Compensation of Key Management Personnel (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Related Party [Abstract]    
Salaries and other benefits $ 6.0 $ 5.7
Retirement benefits 0.3 6.1
Share-based payments 3.1 2.5
Key management personnel compensation $ 9.4 $ 14.3