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Share-based compensation reserve (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reserves within equity [line items]      
Beginning balance, Reserve of share-based payments € 8.3    
Increase (decrease) through share-based payment transactions, equity 5.1 € 9.0 € 14.9
Increase (Decrease) Through Vesting Of Other Equity Instruments In Share-Based Payment Transactions, Equity   0.0 (0.8)
Reclassification of awards for settlement of tax liabilities (16.9) (14.7) € 0.4
Ending balance, Reserve of share-based payments 6.9 8.3  
Share based compensation reserve      
Disclosure of reserves within equity [line items]      
Beginning balance, Reserve of share-based payments 8.3    
Ending balance, Reserve of share-based payments 6.9 € 8.3  
Non-Executive Director | Share based compensation reserve      
Disclosure of reserves within equity [line items]      
Increase (decrease) through share-based payment transactions, equity 0.8    
Key management personnel | Share based compensation reserve      
Disclosure of reserves within equity [line items]      
Increase (decrease) through share-based payment transactions, equity 4.3    
Increase (Decrease) Through Vesting Of Other Equity Instruments In Share-Based Payment Transactions, Equity 0.7    
Restricted Shares | Non-Executive Director      
Disclosure of reserves within equity [line items]      
Reclassification of awards for settlement of tax liabilities € (5.8)