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Payroll costs, share based payments and management incentive schemes - Information About the Number of Persons Employed by the Company (Details) - employee
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Employee Information [Line Items]      
Average number of employees 5,503 4,690 4,756
Production      
Employee Information [Line Items]      
Average number of employees 3,310 3,043 3,308
Administration, distribution & sales      
Employee Information [Line Items]      
Average number of employees 2,193 1,647 1,448