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Significant events after the Statement of Financial Position date (Details)
12 Months Ended
Dec. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Jan. 02, 2018
shares
Dec. 31, 2017
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2017
€ / shares
shares
Dec. 31, 2015
€ / shares
Disclosure of non-adjusting events after reporting period [line items]                  
Percentage increase in dividend price 20.00%   20.00% 20.00% 20.00%        
Dividend price per share (in dollars per share) | (per share) $ 21.7289 $ 21.7289     $ 21.7289 $ 16.7538 $ 11.4824 € 16.6516 € 11.4824
Ordinary shares                  
Disclosure of non-adjusting events after reporting period [line items]                  
Share dividend issued (in shares)     8,705,890     171,092 8,705,890 8,705,890  
Founder Entities [Member] | Ordinary shares                  
Disclosure of non-adjusting events after reporting period [line items]                  
Share dividend issued (in shares)         6,421,074