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SHARE-BASED COMPENSATION - Number and Movement of Potential Shares (Details)
 12 Months Ended
Dec. 31, 2020
EUR (€)
shares
Dec. 31, 2019
EUR (€)
shares
Performance-Based RSU    
Disclosure of movement of potential shares [line items]    
Potential Shares, Beginning balance (in shares) 2,519,294 3,085,164
Potential Shares, Granted (in shares) 1,049,839 1,028,342
Potential Shares, Over-performance (in shares) 677,944 248,230
Potential Shares, Vested (in shares) (1,458,985) (1,758,062)
Potential Shares, Forfeited (in shares) (193,765) (84,380)
Potential Shares, Ending balance (in shares) 2,594,327 2,519,294
Weighted- Average Grant-Date Fair Value per Share, Beginning balance | € € 12.11 € 10.45
Weighted- Average Grant-Date Fair Value per Share, Granted | € 6.65 10.44
Weighted- Average Grant-Date Fair Value per Share, Over-performance | € 11.52 8.94
Weighted- Average Grant-Date Fair Value per Share, Vested | € 11.52 7.97
Weighted- Average Grant-Date Fair Value per Share, Forfeited | € 10.94 8.02
Weighted- Average Grant-Date Fair Value per Share, Ending balance | € € 10.17 € 12.11
Percentage of vesting multiplier 100.00%  
Performance based shares forfeited upon departure of certain beneficiaries (in shares) 193,765  
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) 2,066,503 1,312,524
Potential Shares, Granted (in shares) 910,047 899,926
Potential Shares, Over-performance (in shares) 0 0
Potential Shares, Vested (in shares) (589,655) (106,000)
Potential Shares, Forfeited (in shares) (154,984) (39,947)
Potential Shares, Ending balance (in shares) 2,231,911 2,066,503
Weighted- Average Grant-Date Fair Value per Share, Beginning balance | € € 8.08 € 8.47
Weighted- Average Grant-Date Fair Value per Share, Granted | € 4.64 7.10
Weighted- Average Grant-Date Fair Value per Share, Over-performance | € 0 0
Weighted- Average Grant-Date Fair Value per Share, Vested | € 7.50 4.55
Weighted- Average Grant-Date Fair Value per Share, Forfeited | € 7.37 8.31
Weighted- Average Grant-Date Fair Value per Share, Ending balance | € € 6.88 € 8.08
Equity Award Plans    
Disclosure of movement of potential shares [line items]    
Potential Shares, Beginning balance (in shares) 79,526 57,913
Potential Shares, Granted (in shares) 0 73,799
Potential Shares, Over-performance (in shares) 0 0
Potential Shares, Vested (in shares) (46,614) (42,559)
Potential Shares, Forfeited (in shares) 0 (9,627)
Potential Shares, Ending balance (in shares) 32,912 79,526
Weighted- Average Grant-Date Fair Value per Share, Beginning balance | € € 8.71 € 8.31
Weighted- Average Grant-Date Fair Value per Share, Granted | € 0 8.39
Weighted- Average Grant-Date Fair Value per Share, Over-performance | € 0 0
Weighted- Average Grant-Date Fair Value per Share, Vested | € 8.94 7.60
Weighted- Average Grant-Date Fair Value per Share, Forfeited | € 0 8.71
Weighted- Average Grant-Date Fair Value per Share, Ending balance | € € 8.39 € 8.71