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STOCK-BASED COMPENSATION - OTHER THAN OPTIONS SPLIT CRITERION (Details) - Performance stock units - LTIP
6 Months Ended
Jun. 30, 2021
2019  
STOCK-BASED COMPENSATION  
TSR 50.00%
ROCE 50.00%
2020  
STOCK-BASED COMPENSATION  
TSR 67.00%
ROCE 33.00%
2021  
STOCK-BASED COMPENSATION  
TSR 100.00%
ROCE 0.00%