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Share capital and reserves - Ordinary Shares Narrative (Details)
€ / shares in Units, $ / shares in Units, € in Millions, $ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2019
EUR (€)
$ / shares
shares
Jun. 19, 2019
shares
$ / shares
Jun. 14, 2019
€ / shares
Mar. 22, 2019
EUR (€)
€ / shares
shares
Mar. 22, 2019
USD ($)
Dec. 31, 2018
EUR (€)
$ / shares
shares
Jun. 19, 2018
$ / shares
Jun. 14, 2018
shares
$ / shares
Jan. 02, 2018
shares
Jun. 19, 2017
shares
$ / shares
Jun. 16, 2016
$ / shares
Jul. 31, 2019
shares
Dec. 31, 2019
EUR (€)
$ / shares
shares
Dec. 31, 2019
EUR (€)
shares
Dec. 31, 2018
EUR (€)
$ / shares
shares
Dec. 31, 2018
EUR (€)
shares
Dec. 31, 2017
EUR (€)
$ / shares
shares
Dec. 31, 2017
EUR (€)
€ / shares
shares
Dec. 31, 2015
€ / shares
Disclosure of classes of share capital [line items]                                      
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
Proceeds from issuance of Ordinary Shares | €                           € 354.1   € 0.1   € 0.0  
Costs related to transactions | €                           0.0   0.0   3.2  
Payments to acquire or redeem entity's shares | €                           0.0   0.0   177.6  
Listing and share transaction costs | € $ 24.9         $ 13.8             $ 24.9 € 24.9 $ 13.8 € 13.8 $ 13.8 € 13.8  
Annual Founder Preferred Share Amount last 10 trading days | $ / shares                                 $ 16.6516    
Restricted Shares                                      
Disclosure of classes of share capital [line items]                                      
Number of shares vested                           85,315          
Key management personnel | Restricted Shares                                      
Disclosure of classes of share capital [line items]                                      
Number of shares issued 4,518,964                       4,518,964 4,518,964          
Non-Executive Director                                      
Disclosure of classes of share capital [line items]                                      
Number of shares vested                       2,460              
Non-Executive Director | Restricted Shares                                      
Disclosure of classes of share capital [line items]                                      
Share price (in dollars per share) | $ / shares   $ 20.74           $ 17.94   $ 14.38                  
Exercise price (in dollars per share) | (per share)     € 20.32       $ 18.07       $ 8.98                
Number of shares vested   44,272           53,498   55,680       56,250   9,375      
Shares paid for tax withholding for share based compensation   12,100           12,312   9,384       400,000          
Ordinary shares                                      
Disclosure of classes of share capital [line items]                                      
Shares issued in the period (in shares)                           20,300,000   8,900,000      
Share dividend issued (in shares)                 8,705,890             171,092   8,705,890  
Number of shares issued       20,000,000                              
Share price (in dollars per share) | € / shares       € 20.00                              
Proceeds from issuance of Ordinary Shares       € 353.6 $ 400.0                            
Costs related to transactions | €       € 11.1                              
Number of shares outstanding 194,500,000         174,200,000             194,500,000 194,500,000 174,200,000 174,200,000 165,300,000 165,300,000