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Equity settled share-based payments - The 2020 Option Plan (Details) - shares
Jan. 16, 2020
Aug. 27, 2018
Sep. 30, 2020
Jan. 31, 2020
Vesting tranche one        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting percentage   40.00%    
Vesting tranche two        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting percentage   30.00%    
Vesting tranche three        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting percentage   30.00%    
Share option        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Maximum aggregate number of shares that can be awarded     14,057,500 31,618,125
Share option | Vesting tranche one        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting percentage 20.00%      
Share option | Vesting tranche two        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting percentage 20.00%      
Share option | Vesting tranche three        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting percentage 20.00%      
Share option | Vesting tranche four        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting percentage 20.00%      
Share option | Vesting tranche five        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Vesting percentage 20.00%