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Share Capital and Capital reserve - Narrative (Details)
$ / shares in Units, € in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 14, 2019
shares
Mar. 22, 2019
EUR (€)
shares
Mar. 22, 2019
USD ($)
$ / shares
shares
Jan. 02, 2019
shares
Jun. 14, 2018
shares
Aug. 31, 2019
EUR (€)
shares
Jun. 30, 2019
EUR (€)
shares
Sep. 30, 2019
shares
Jun. 30, 2019
Sep. 30, 2019
EUR (€)
shares
Sep. 30, 2018
EUR (€)
Dec. 31, 2018
$ / shares
Dec. 31, 2017
$ / shares
Disclosure of classes of share capital [line items]                          
Percentage increase in dividend price       20.00%         20.00%        
Dividends recognised as distributions to owners per share (in dollars per share) | $ / shares                       $ 16.7538 $ 16.6516
Preference shares, dividend payment terms, weighted average share price, minimum term required                   10 days   10 days  
Increase (decrease) in number of ordinary shares issued (in shares)   20,000,000 20,000,000                    
Shares issued, price per share (in dollars per share) | $ / shares     $ 20.00                    
Proceeds from issuing shares   € 353.6 $ 400.0                    
Share issue related cost | €   € 11.1                      
Number of shares reserved for issue under options and contracts for sale of shares (in shares)           125,000              
Increase (Decrease) Through Vesting Of Other Equity Instruments In Share-Based Payment Transactions, Equity | €           € 0.1 € 0.1     € (0.2) € (0.2)    
Founder Entities | Ordinary shares                          
Disclosure of classes of share capital [line items]                          
Founder preferred shares annual dividend amount (in shares)       171,092                  
Non-Executive Director                          
Disclosure of classes of share capital [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                   32,167      
New awards granted in the period (in shares)               2,460   39,370      
Restricted shares                          
Disclosure of classes of share capital [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares)                   85,315      
New awards granted in the period (in shares)                   173,293      
Restricted shares | Non-Executive Director                          
Disclosure of classes of share capital [line items]                          
Number of other equity instruments exercised or vested in share-based payment arrangement (in shares) 32,167         9,375 9,375            
New awards granted in the period (in shares) 44,272       44,272