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Related parties (Details)
€ / shares in Units, $ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Jun. 15, 2015
USD ($)
Jun. 30, 2017
shares
Dec. 31, 2019
EUR (€)
shares
year
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Dec. 31, 2019
$ / shares
shares
Jun. 19, 2019
$ / shares
Mar. 22, 2019
€ / shares
shares
Jun. 14, 2018
$ / shares
Jun. 19, 2017
$ / shares
Jun. 01, 2015
$ / shares
shares
Jun. 01, 2015
€ / shares
shares
Disclosure of transactions between related parties [line items]                        
Payments to acquire or redeem entity's shares | €     € 0 € 0 € 177,600,000              
Ordinary shares                        
Disclosure of transactions between related parties [line items]                        
Share price (in dollars per share) | € / shares               € 20.00        
Number of shares issued               20,000,000        
Restricted Shares | Key management personnel                        
Disclosure of transactions between related parties [line items]                        
Number of shares issued           4,518,964            
Restricted Shares | Non-Executive Director                        
Disclosure of transactions between related parties [line items]                        
Share price (in dollars per share) | $ / shares             $ 20.74   $ 17.94 $ 14.38    
Mariposa Capital and TOMS Capital | Affiliate Of Founder Entities                        
Disclosure of transactions between related parties [line items]                        
Advisory Services Agreement, annual fee | $ $ 2.0                      
Advisory Services Agreement, renewal term 1 year                      
Advisory Services Agreement, expiration notice term 90 days                      
Advisory Services Agreement, termination term 6 months                      
Mariposa Capital | Affiliate Of Founder Entities                        
Disclosure of transactions between related parties [line items]                        
Travel expenses reimbursed to related party | €     200,000 200,000                
TOMS Capital | Affiliate Of Founder Entities                        
Disclosure of transactions between related parties [line items]                        
Travel expenses reimbursed to related party | €     € 300,000 € 100,000                
Lord Myners | Non-Executive Director                        
Disclosure of transactions between related parties [line items]                        
Option life | year     5                  
Lord Myners | Ordinary shares | Non-Executive Director                        
Disclosure of transactions between related parties [line items]                        
Share price (in dollars per share) | $ / shares           $ 11.50            
Number of shares issued           95,652            
Number of share options granted     50,000                  
Iglo | Paul Kenyon | Key management personnel                        
Disclosure of transactions between related parties [line items]                        
Share price (in dollars per share) | (per share)                     $ 10.50 € 9.71
Number of shares issued                     37,060 37,060
Number of shares sold   26,372                    
Iglo | Tania Howarth | Key management personnel                        
Disclosure of transactions between related parties [line items]                        
Share price (in dollars per share) | (per share)                     $ 10.50 € 9.71