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Share based compensation reserve - Director and Senior Management Share Awards (Details) - Restricted shares
9 Months Ended
Sep. 30, 2019
shares
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of other equity instruments outstanding (in shares) 4,624,653
New awards granted in the period 173,293
Forfeitures in the period 130,239
Awards vested and issued in period 85,315
Number of other equity instruments outstanding (in shares) 4,582,392
January 1, 2016  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of other equity instruments outstanding (in shares) 3,025,953
New awards granted in the period 0
Forfeitures in the period 55,439
Number of other equity instruments outstanding (in shares) 2,970,514
January 1, 2017  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of other equity instruments outstanding (in shares) 1,015,000
New awards granted in the period 0
Forfeitures in the period 40,000
Awards vested and issued in period 85,315
Number of other equity instruments outstanding (in shares) 889,685
January 1, 2018  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of other equity instruments outstanding (in shares) 583,700
New awards granted in the period 0
Forfeitures in the period 34,800
Number of other equity instruments outstanding (in shares) 548,900
January 1, 2019  
Disclosure of terms and conditions of share-based payment arrangement [line items]  
Number of other equity instruments outstanding (in shares) 0
New awards granted in the period 173,293
Forfeitures in the period 0
Number of other equity instruments outstanding (in shares) 173,293