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Directors and Key Management compensation (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party [Abstract]      
Short-term employee benefits € 2.8 € 3.3 € 2.0
Share-based payment expense 7.6 6.3 1.4
Termination benefits 0.0 0.1 0.4
Non-Executive Director fees 0.4 0.4 0.3
Total Directors' and executive officers' compensation € 10.8 € 10.1 € 4.1