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Share based compensation reserve - Director and Senior Management Share Awards (Narrative) (Details)
$ / shares in Units, € in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2019
shares
$ / shares
Sep. 30, 2018
shares
$ / shares
Sep. 30, 2019
EUR (€)
shares
Sep. 30, 2018
EUR (€)
Sep. 30, 2019
EUR (€)
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2018
EUR (€)
Mar. 22, 2019
$ / shares
Jan. 01, 2019
EUR (€)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
shares
Jan. 01, 2018
EUR (€)
Jan. 01, 2018
USD ($)
Jan. 01, 2017
EUR (€)
Jan. 01, 2017
USD ($)
Jan. 01, 2016
EUR (€)
Jan. 01, 2016
USD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Shares issued, price per share (in dollars per share) | $ / shares               $ 20.00                  
Key management personnel compensation | €     € 3.6 € 2.9 € 10.4   € 8.8                    
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
Restricted shares                                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Number of other equity instruments outstanding (in shares)     4,582,392   4,582,392 4,582,392         4,624,653            
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)         85,315 85,315                      
LTIP vesting                                  
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 (in shares) 51,932 181,054                              
Share-based Compensation Award, Tranche Two | Key management personnel of entity or parent | Restricted shares                                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights, Percentage1         50.00% 50.00%                      
January 1, 2016 | Restricted shares                                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Number of other equity instruments outstanding (in shares)     2,970,514   2,970,514 2,970,514         3,025,953            
January 1, 2016 | Key management personnel of entity or parent | Restricted shares                                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Incremental fair value granted, modified share-based payment arrangements         € 8.7 $ 9.9                      
January 1, 2016 | Share-based Compensation Award, Tranche One | Key management personnel of entity or parent | Restricted shares                                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Period2         2 years 2 years                      
January 1, 2017 | Restricted shares                                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Number of other equity instruments outstanding (in shares)     889,685   889,685 889,685         1,015,000            
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)         85,315 85,315                      
January 1, 2017 | Key management personnel of entity or parent | Restricted shares                                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Incremental fair value granted, modified share-based payment arrangements         € 1.0 $ 1.1                      
January 1, 2017 | Share-based Compensation Award, Tranche One | Key management personnel of entity or parent | Restricted shares                                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Period2         2 years 2 years                      
January 1, 2018 | Restricted shares                                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Number of other equity instruments outstanding (in shares)     548,900   548,900 548,900         583,700            
January 1, 2018 | Share-based Compensation Award, Tranche One | Key management personnel of entity or parent | Restricted shares                                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Period2         2 years 2 years                      
Share-based Compensation Award, Tranche Two | January 1, 2016 | Key management personnel of entity or parent | Restricted shares                                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Period2         3 years 3 years                      
Share-based Compensation Award, Tranche Two | January 1, 2017 | Key management personnel of entity or parent | Restricted shares                                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Period2         2 years 2 years                      
Share-based Compensation Award, Tranche Two | January 1, 2018 | Key management personnel of entity or parent | Restricted shares                                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                                  
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Period2         3 years 3 years                      
January 1, 2019 | Restricted shares                                  
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 (in shares)     173,293                            
Management Award 2016 | Restricted shares                                  
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 (in shares)   294,810                              
Liabilities From Share-based Payment Transactions, Shares   113,756                              
Shares issued, price per share (in dollars per share) | $ / shares   $ 20.72                              
Management Award 2017 | Restricted shares                                  
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 (in shares) 85,315                                
Liabilities From Share-based Payment Transactions, Shares 33,383                                
Shares issued, price per share (in dollars per share) | $ / shares $ 17.11