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Payroll costs, share based payments and management incentive schemes - Inputs and Assumptions Underlying the Monte Carlo Model (Details)
$ / shares in Units, € in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
$ / shares
Dec. 31, 2020
Jan. 01, 2021
USD ($)
Jan. 01, 2021
EUR (€)
Jan. 01, 2020
USD ($)
Jan. 01, 2020
EUR (€)
Jan. 01, 2019
USD ($)
Jan. 01, 2019
EUR (€)
Jan. 01, 2018
USD ($)
Jan. 01, 2018
EUR (€)
Disclosure of terms and conditions of share-based payment arrangement [line items]                    
FV of equity instruments     $ 7.0 € 5.8 $ 4.8 € 4.3 $ 1.4 € 1.2 $ 1.6 € 1.3
January 1, 2018 | Restricted Shares                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                    
Grant date price (in Dollar per share) $ 16.72                  
Exercise price (in Dollar per share) $ 0                  
Expected volatility of the share price 22.70%                  
Dividend yield expected 0.00%                  
Risk free rate 2.55%                  
Employee exit rate 14.00%                  
EBITDA Performance Target Condition 35.00%                  
January 1, 2018 | Minimum | Restricted Shares                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                    
Expected life of restricted share 1 year 6 months                  
January 1, 2018 | Top of range | Restricted Shares                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                    
Expected life of restricted share 4 years                  
January 1, 2019 | Restricted Shares                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                    
Grant date price (in Dollar per share) $ 20.15                  
Exercise price (in Dollar per share) $ 0                  
Expected life of restricted share 4 years                  
Expected volatility of the share price 24.00%                  
Dividend yield expected 0.00%                  
Risk free rate 1.33%                  
Employee exit rate 14.00%                  
EBITDA Performance Target Condition 35.00%                  
January 1, 2020 | Restricted Shares                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                    
Grant date price (in Dollar per share) $ 22.37                  
Exercise price (in Dollar per share) $ 0                  
Expected volatility of the share price 24.40%                  
Dividend yield expected 0.00%                  
Risk free rate 1.70%                  
Employee exit rate 27.30%                  
EBITDA Performance Target Condition 35.00%                  
january 1, 2021 | Restricted Shares                    
Disclosure of terms and conditions of share-based payment arrangement [line items]                    
Grant date price (in Dollar per share) $ 25.42                  
Exercise price (in Dollar per share) $ 0                  
Expected life of restricted share 3 years 3 years                
Expected volatility of the share price 30.00%                  
Dividend yield expected 0.00%                  
Risk free rate 0.24%                  
Employee exit rate 14.00%                  
EBITDA Performance Target Condition 35.00%