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Payroll costs, share based payments and management incentive schemes - Director and Senior Management Share Awards (Details) - Restricted Shares - shares
1 Months Ended 12 Months Ended
Jan. 31, 2020
Sep. 30, 2019
Dec. 31, 2021
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period     3,178,400
New awards granted in the period     820,202
Awards vested and issued in the period     (1,861,826)
Forfeitures in the period     (119,921)
Number of other equity instruments outstanding in share-based payment arrangement at end of period     2,016,855
January 1, 2016      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period     1,041,953
New awards granted in the period     0
Awards vested and issued in the period     (1,041,953)
Forfeitures in the period     0
Number of other equity instruments outstanding in share-based payment arrangement at end of period     0
January 1, 2017      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period     819,873
New awards granted in the period     0
Awards vested and issued in the period     (819,873)
Forfeitures in the period     0
Number of other equity instruments outstanding in share-based payment arrangement at end of period     0
January 1, 2018      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period     446,575
New awards granted in the period     0
Awards vested and issued in the period     0
Forfeitures in the period     (14,785)
Number of other equity instruments outstanding in share-based payment arrangement at end of period     431,790
January 1, 2019      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period     159,561
New awards granted in the period   166,427 0
Awards vested and issued in the period     0
Forfeitures in the period     (6,866)
Number of other equity instruments outstanding in share-based payment arrangement at end of period     152,695
January 1, 2020      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period     710,438
New awards granted in the period 761,979   0
Awards vested and issued in the period     0
Forfeitures in the period     (65,345)
Number of other equity instruments outstanding in share-based payment arrangement at end of period     645,093
january 1, 2021      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Number of other equity instruments outstanding in share-based payment arrangement at beginning of period     0
New awards granted in the period     820,202
Awards vested and issued in the period     0
Forfeitures in the period     (32,925)
Number of other equity instruments outstanding in share-based payment arrangement at end of period     787,277