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Share based compensation reserve - Non-Executive Director Restricted Share Awards (Details)
€ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 14, 2019
USD ($)
shares
Jun. 14, 2018
USD ($)
shares
Aug. 31, 2019
shares
Jun. 30, 2019
shares
Sep. 30, 2019
EUR (€)
shares
Sep. 30, 2018
EUR (€)
Sep. 30, 2019
EUR (€)
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
EUR (€)
Non-Executive Director                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                  
New awards granted in the period (in shares)         2,460   39,370 39,370  
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)             32,167 32,167  
Restricted shares                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                  
New awards granted in the period (in shares)             173,293 173,293  
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)             85,315 85,315  
Restricted shares | Non-Executive Director                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                  
Other Equity Instruments Granted In Share-based Payment Arrangement, Per Director | $               $ 100,000  
New awards granted in the period (in shares) 44,272 44,272              
Liabilities From Share-based Payment Transactions, Shares 12,105                
Weighted average exercise price of other equity instruments granted in share-based payment arrangement | $ $ 20.32 $ 18.07              
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) 32,167   9,375 9,375          
Expense from share-based payment transactions with employees | €         € 0.2 € 0.2 € 0.7   € 0.7