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SHARE-BASED COMPENSATION - Number and Movement of Potential Shares (Details)
 12 Months Ended
Dec. 31, 2023
EUR (€)
shares
Dec. 31, 2022
EUR (€)
shares
Performance-Based RSU    
Disclosure of movement of potential shares [line items]    
Potential Shares, Beginning balance (in shares) 2,185,834 2,526,527
Potential Shares, Granted (in shares) 701,945 603,023
Potential Shares, Over-performance (in shares) 723,514 924,634
Potential Shares, Vested (in shares) (1,701,233) (1,849,268)
Potential Shares, Forfeited (in shares) (112,881) (19,082)
Potential Shares, Ending balance (in shares) 1,797,179 2,185,834
Weighted- Average Grant-Date Fair Value per Share, Beginning balance | € € 15.56 € 11.71
Weighted- Average Grant-Date Fair Value per Share, Granted | € 21.56 23.70
Weighted- Average Grant-Date Fair Value per Share, Over-performance | € 6.65 10.44
Weighted- Average Grant-Date Fair Value per Share, Vested | € 6.65 10.44
Weighted- Average Grant-Date Fair Value per Share, Forfeited | € 22.74 11.65
Weighted- Average Grant-Date Fair Value per Share, Ending balance | € € 22.29 € 15.56
Percentage of vesting multiplier 100.00%  
Performance based shares forfeited upon departure of certain beneficiaries (in shares) 112,881  
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) 1,875,446 2,148,999
Potential Shares, Granted (in shares) 701,976 556,360
Potential Shares, Over-performance (in shares) 0 0
Potential Shares, Vested (in shares) (817,059) (774,958)
Potential Shares, Forfeited (in shares) (95,993) (54,955)
Potential Shares, Ending balance (in shares) 1,664,370 1,875,446
Weighted- Average Grant-Date Fair Value per Share, Beginning balance | € € 10.80 € 7.79
Weighted- Average Grant-Date Fair Value per Share, Granted | € 15.26 17.11
Weighted- Average Grant-Date Fair Value per Share, Over-performance | € 0 0
Weighted- Average Grant-Date Fair Value per Share, Vested | € 4.64 7.10
Weighted- Average Grant-Date Fair Value per Share, Forfeited | € 15.61 9.04
Weighted- Average Grant-Date Fair Value per Share, Ending balance | € € 15.43 € 10.80