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Directors and Key Management compensation - Additional Information (Details)
12 Months Ended
Dec. 31, 2021
director
executive_officer
Dec. 31, 2020
director
executive_officer
Dec. 31, 2019
director
executive_officer
Related Party [Abstract]      
Number of Members of Key Management Accruing Benefits Under Money Purchase Schemes | director 2 2 2
Number of executive Officers accruing benefits under share-based payment schemes | executive_officer 2 2 2