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SHARE-BASED COMPENSATION - Number and Movement of Potential Shares (Details) | 12 Months Ended
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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

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