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SHARE-BASED COMPENSATION - Number and Movement of Potential Shares (Details)
 6 Months Ended
Jun. 30, 2021
shares
Disclosure of movement of potential shares [line items]  
Potential Shares, Beginning balance (in shares) 4,859,150
Potential Shares, Granted (in shares) 1,149,054
Potential Shares, Over-performance (in shares) 526,551
Potential Shares, Vested (in shares) (1,714,694)
Potential Shares, Forfeited (in shares) (40,785)
Potential Shares, Ending balance (in shares) 4,779,276
Performance-Based RSU  
Disclosure of movement of potential shares [line items]  
Potential Shares, Beginning balance (in shares) 2,594,327
Potential Shares, Granted (in shares) 614,555
Potential Shares, Over-performance (in shares) 526,551
Potential Shares, Vested (in shares) (1,161,718)
Potential Shares, Forfeited (in shares) (9,970)
Potential Shares, Ending balance (in shares) 2,563,745
Percentage of vesting multiplier 100.00%
Performance based shares forfeited upon departure of certain beneficiaries (in shares) 9,970
Performance based shares forfeited upon non-fulfillment of performance conditions (in shares) 0
Restricted Stock Units  
Disclosure of movement of potential shares [line items]  
Potential Shares, Beginning balance (in shares) 2,231,911
Potential Shares, Granted (in shares) 534,499
Potential Shares, Over-performance (in shares) 0
Potential Shares, Vested (in shares) (520,064)
Potential Shares, Forfeited (in shares) (30,815)
Potential Shares, Ending balance (in shares) 2,215,531
Equity Award Plans  
Disclosure of movement of potential shares [line items]  
Potential Shares, Beginning balance (in shares) 32,912
Potential Shares, Granted (in shares) 0
Potential Shares, Over-performance (in shares) 0
Potential Shares, Vested (in shares) (32,912)
Potential Shares, Forfeited (in shares) 0
Potential Shares, Ending balance (in shares) 0