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Share capital and reserves - Ordinary Shares Narrative (Details)
1 Months Ended 2 Months Ended 12 Months Ended
Aug. 05, 2021
USD ($)
shares
Jun. 30, 2021
shares
$ / shares
Jan. 30, 2021
EUR (€)
shares
Jan. 30, 2021
USD ($)
$ / shares
shares
Jun. 17, 2020
shares
$ / shares
Mar. 13, 2020
EUR (€)
shares
Mar. 13, 2020
USD ($)
shares
Jun. 14, 2019
shares
$ / shares
Aug. 31, 2020
EUR (€)
shares
Aug. 31, 2020
USD ($)
shares
May 31, 2020
shares
Jul. 31, 2019
shares
Mar. 02, 2022
EUR (€)
shares
Mar. 02, 2022
USD ($)
shares
Dec. 31, 2021
EUR (€)
shares
Dec. 31, 2021
USD ($)
shares
$ / shares
Dec. 31, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
shares
Aug. 05, 2021
EUR (€)
Dec. 31, 2020
$ / shares
Aug. 01, 2020
$ / shares
Disclosure of classes of share capital [line items]                                          
Share repurchase programme | $ $ 500,000,000           $ 300,000,000     $ 500,000,000                      
Proceeds from issuance of Ordinary Shares | €                             € 0   € 600,000 € 354,100,000      
Payments to acquire or redeem entity's shares | €                             77,600,000   608,600,000 0      
Share based payment charge | €                             € 5,100,000   € 9,000,000.0 € 14,900,000      
Shares repurchased, payable | €                                     € 3,000,000    
Events after Reporting Period                                          
Disclosure of classes of share capital [line items]                                          
Number of shares repurchased (in shares) | shares 135,621                                        
Restricted Shares                                          
Disclosure of classes of share capital [line items]                                          
Number of equity instruments exercised (in shares) | shares                             1,861,826 1,861,826          
Non-Executive Director | Restricted Shares                                          
Disclosure of classes of share capital [line items]                                          
Share price (in dollars per share) | $ / shares   $ 30.14     $ 21.78     $ 20.74                          
Number of equity instruments exercised (in shares) | shares   32,140     34,447     44,272     49,196 2,460           56,250      
Ordinary shares                                          
Disclosure of classes of share capital [line items]                                          
Share price (in dollars per share) | $ / shares       $ 25.29                       $ 24.50       $ 21.04 $ 25.50
Costs related to transactions | €           € 200,000     € 1,900,000           € 100,000            
Number of shares repurchased (in shares) | shares     507,396 507,396   11,913,682 11,913,682   18,061,952 18,061,952         3,090,082 3,090,082          
Payments to acquire or redeem entity's shares     € 10.5 $ 12.8   € 217,400,000 $ 250,900,000   € 389,300,000 $ 460,600,000         € 67,100,000 $ 75,800,000          
Ordinary shares | Events after Reporting Period                                          
Disclosure of classes of share capital [line items]                                          
Number of shares repurchased (in shares) | shares                         1,160,547 1,160,547              
Payments to acquire or redeem entity's shares                         € 26,900,000 $ 30,500,000