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Share-based compensation reserve - Additional Information (Details) - EUR (€)
 12 Months Ended
Jun. 30, 2021
Jun. 17, 2020
Jun. 14, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reserves within equity [line items]            
Vesting of Non-Executive Restricted Stock award         € 0 € (800,000)
Share based payment charge       € 5,100,000 9,000,000.0 14,900,000
Non-Executive Director | Share based compensation reserve            
Disclosure of reserves within equity [line items]            
Share based payment charge       800,000    
Non-Executive Director | Restricted Shares            
Disclosure of reserves within equity [line items]            
Shares paid for tax withholding for share based compensation 7,734 8,656 12,100      
Key management personnel | Share based compensation reserve            
Disclosure of reserves within equity [line items]            
Vesting of Non-Executive Restricted Stock award       700,000    
Share based payment charge       4,300,000    
Share based compensation reserve            
Disclosure of reserves within equity [line items]            
Vesting of Non-Executive Restricted Stock award       (600,000) (700,000) (800,000)
Share based payment charge       € 5,100,000 € 9,000,000.0 € 14,900,000
Share based compensation reserve | Non-Executive Director | Restricted Shares            
Disclosure of reserves within equity [line items]            
Share based payment charge € 0.2   € 100,000