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Share-based compensation reserve - Additional Information (Details) - EUR (€)
€ in Millions
1 Months Ended 12 Months Ended
Jun. 19, 2019
Jun. 14, 2018
Jun. 19, 2017
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reserves within equity [line items]              
Increase (Decrease) Through Vesting Of Other Equity Instruments In Share-Based Payment Transactions, Equity       € 0.1 € (0.8) € (0.2) € (0.1)
Share based payment charge         14.9 13.0 2.6
Share based compensation reserve              
Disclosure of reserves within equity [line items]              
Increase (Decrease) Through Vesting Of Other Equity Instruments In Share-Based Payment Transactions, Equity         0.8    
Non-Executive Director | Share based compensation reserve              
Disclosure of reserves within equity [line items]              
Share based payment charge         € 0.9    
Non-Executive Director | Restricted Shares              
Disclosure of reserves within equity [line items]              
Shares paid for tax withholding for share based compensation 12,100 12,312 9,384   400,000    
Key management personnel | Share based compensation reserve              
Disclosure of reserves within equity [line items]              
Share based payment charge         € 14.0    
Share based compensation reserve              
Disclosure of reserves within equity [line items]              
Increase (Decrease) Through Vesting Of Other Equity Instruments In Share-Based Payment Transactions, Equity         (0.8) (0.8) (0.7)
Share based payment charge         € 14.9 € 13.0 € 2.6
Share based compensation reserve | Non-Executive Director | Restricted Shares              
Disclosure of reserves within equity [line items]              
Share based payment charge € 0.0 € 0.0 € 0.3