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Share capital and reserves - Ordinary Shares (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2019
$ / shares
shares
Jun. 19, 2019
shares
$ / shares
Jun. 14, 2019
shares
Dec. 31, 2018
$ / shares
shares
Jun. 19, 2018
shares
Jun. 14, 2018
shares
$ / shares
Jan. 02, 2018
shares
Dec. 31, 2017
shares
Jun. 19, 2017
shares
$ / shares
Jun. 16, 2016
shares
Jul. 31, 2019
shares
Sep. 30, 2018
shares
Dec. 31, 2019
shares
$ / shares
Dec. 31, 2018
shares
$ / shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2017
€ / shares
shares
Dec. 31, 2016
Dec. 31, 2015
€ / shares
Mar. 22, 2019
€ / shares
Apr. 11, 2014
shares
Disclosure of classes of share capital [line items]                                        
Number of shares reserved for issue under options and contracts for sale of shares 59,375                       59,375             125,000
Reconciliation of number of shares outstanding [abstract]                                        
Percentage increase in dividend price 20.00%           20.00% 20.00%         20.00%              
Dividends recognised as distributions to owners per share (in dollars per share) | (per share) $ 21.7289     $ 21.7289                 $ 21.7289 $ 16.7538 $ 11.4824 € 16.6516   € 11.4824    
Annual Founder Preferred Share Amount last 10 trading days | $ / shares                             $ 16.6516          
Preference shares, dividend payment terms, weighted average share price, minimum term required                           10 days     10 days      
Ordinary shares                                        
Disclosure of classes of share capital [line items]                                        
Share dividend issued (in shares)             8,705,890             171,092 8,705,890 8,705,890        
Reconciliation of number of shares outstanding [abstract]                                        
Number of shares outstanding, beginning balance (in shares)                         174,200,000 165,300,000            
Shares issued in the period (in shares)                         20,300,000 8,900,000            
Number of shares outstanding, ending balance (in shares) 194,500,000     174,200,000       165,300,000         194,500,000 174,200,000 165,300,000 165,300,000        
Shares Issued, Price Per Share1 | € / shares                                     € 20.00  
Initial options [Domain]                                        
Disclosure of classes of share capital [line items]                                        
Number of shares reserved for issue under options and contracts for sale of shares 125,000                       125,000              
Key Management Personnel Of Entity Or Parent, Non-Executive Director [Member]                                        
Reconciliation of number of shares outstanding [abstract]                                        
Number of other equity instruments exercised or vested in share-based payment arrangement                     2,460                  
Founder Entities [Member] | Ordinary shares                                        
Disclosure of classes of share capital [line items]                                        
Share dividend issued (in shares)                         6,421,074              
Restricted Stock1 [Member]                                        
Disclosure of classes of share capital [line items]                                        
Number of other equity instruments granted in share-based payment arrangement                         166,427              
Reconciliation of number of shares outstanding [abstract]                                        
Number of other equity instruments exercised or vested in share-based payment arrangement                         85,315              
Restricted Stock1 [Member] | Key Management Personnel Of Entity Or Parent, Non-Executive Director [Member]                                        
Disclosure of classes of share capital [line items]                                        
Number of other equity instruments granted in share-based payment arrangement     39,370   32,172       53,498 55,680                    
Reconciliation of number of shares outstanding [abstract]                                        
Number of other equity instruments exercised or vested in share-based payment arrangement   44,272       53,498     55,680       56,250 9,375            
Shares Issued, Price Per Share1 | $ / shares   $ 20.74       $ 17.94     $ 14.38                      
Liabilities From Share-based Payment Transactions, Shares   12,100       12,312     9,384       400,000              
Restricted Stock1 [Member] | Management Award 2016 [Member]                                        
Reconciliation of number of shares outstanding [abstract]                                        
Number of other equity instruments exercised or vested in share-based payment arrangement                           294,810            
Liabilities From Share-based Payment Transactions, Shares                           113,756            
Restricted Stock1 [Member] | Management Award 2016 [Member] | Ordinary shares                                        
Reconciliation of number of shares outstanding [abstract]                                        
Number of other equity instruments exercised or vested in share-based payment arrangement                       181,054