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Share-based Payments - Narrative (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Bonus Share Plan, Cash settled      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Awards outstanding (in shares) 12,295 33,046 23,666
Awards vested, deemed settled (in shares) 20,751 15,209 6,754
Deferred Share Plan (DSP)      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Awards outstanding (in shares) 1,599,360    
Awards vested, deemed settled (in shares) 14,623    
DSP 2 year      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Award vesting period 2 years    
DSP 3 year      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Award vesting period 3 years    
DSP 5 year      
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]      
Award vesting period 5 years