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SHARE-BASED COMPENSATION - Additional Information (Details) - EUR (€)
€ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Share Based Payment Plans [line items]    
Total expense related to the potential ordinary shares € 8 € 7
PSUs    
Share Based Payment Plans [line items]    
Share based compensation vesting period 3 years  
PSUs | Bottom of range    
Share Based Payment Plans [line items]    
Percentage of vesting multiplier 0.00%  
PSUs | Top of range    
Share Based Payment Plans [line items]    
Percentage of vesting multiplier 200.00%  
RSUs    
Share Based Payment Plans [line items]    
Share based compensation vesting period 3 years