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EARNINGS PER SHARE - Earnings Per Share Attributable to the Equity Holders (Details) - € / shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings per share [abstract]        
Basic (in EUR per share) € (0.24) € 0.12 € (0.46) € 0.29
Diluted (in EUR per share) € (0.24) € 0.11 € (0.46) € 0.28