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Payroll costs, share based payments and management incentive schemes - Initial Options (Details)
$ / shares in Units, € in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jun. 19, 2019
shares
Jun. 14, 2018
shares
Jun. 19, 2017
shares
Jul. 31, 2019
shares
Jan. 31, 2019
shares
Jun. 30, 2018
EUR (€)
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2019
EUR (€)
shares
Dec. 31, 2018
EUR (€)
shares
Dec. 31, 2017
EUR (€)
Jan. 01, 2019
EUR (€)
Jan. 01, 2019
USD ($)
Jan. 01, 2018
EUR (€)
Jan. 01, 2018
USD ($)
Jan. 01, 2017
EUR (€)
Jan. 01, 2017
USD ($)
Jan. 01, 2016
EUR (€)
Jan. 01, 2016
USD ($)
Apr. 11, 2014
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]                                      
Weighted average fair value at measurement date, other equity instruments granted                     € 1.2 $ 1.4 € 1.3 $ 1.6 € 4.6 $ 5.2 € 24.7 $ 28.2  
Number of shares reserved for issue under options and contracts for sale of shares             59,375 59,375                     125,000
Initial options exercise cost | €               € 0.6                      
Vesting of Non-Executive Restricted Stock award | €           € 0.1   € (0.8) € (0.2) € (0.1)                  
Restricted Stock1 [Member]                                      
Disclosure of terms and conditions of share-based payment arrangement [line items]                                      
Number of other equity instruments exercised or vested in share-based payment arrangement               85,315                      
Management Award 2017 [Member] | Restricted Stock1 [Member]                                      
Disclosure of terms and conditions of share-based payment arrangement [line items]                                      
Number of other equity instruments exercised or vested in share-based payment arrangement         85,315                            
Non-Executive Director                                      
Disclosure of terms and conditions of share-based payment arrangement [line items]                                      
Number of other equity instruments exercised or vested in share-based payment arrangement       2,460                              
Weighted average remaining contractual life of outstanding share options               5 years                      
Share-based payment expense | €               € 0.9 € 0.9 € 0.8                  
Non-Executive Director | Restricted Stock1 [Member]                                      
Disclosure of terms and conditions of share-based payment arrangement [line items]                                      
Number of other equity instruments exercised or vested in share-based payment arrangement 44,272 53,498 55,680         56,250 9,375                    
Ordinary shares | Management Award 2017 [Member] | Restricted Stock1 [Member]                                      
Disclosure of terms and conditions of share-based payment arrangement [line items]                                      
Number of other equity instruments exercised or vested in share-based payment arrangement         51,932                            
Ordinary shares | Non-Executive Director                                      
Disclosure of terms and conditions of share-based payment arrangement [line items]                                      
Exercise price of share options granted (in usd) | $ / shares             $ 11.50                        
Initial options [Domain]                                      
Disclosure of terms and conditions of share-based payment arrangement [line items]                                      
Number of shares reserved for issue under options and contracts for sale of shares             125,000 125,000