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Share Plans - Schedule of Share Options Activities (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Number of shares    
Beginning balance (in shares) 412,804  
Granted during the year (in shares) 174,264  
Exercised during the year (in shares) (271,851)  
Accrued dividend awards (in shares) 7,898  
Lapsed during the year (in shares) (25,628)  
Ending balance (in shares) 297,487 412,804
Options exercisable at December 31, 2021 (in shares) 13,874  
Options expected to vest as of December 31, 2021 (in shares) 269,432  
Weighted- average exercise price    
Beginning balance (in USD per share) $ 0.87  
Granted during the year (in USD per share) 1.00  
Exercised during the year (in USD per share) 0.77  
Accrued dividend awards (in USD per share) 0.95  
Lapsed during the year (in USD per share) 0.92  
Ending balance (in USD per share) 0.99 $ 0.87
Options exercisable at December 31, 2021 (in USD per share) 0.84  
Options expected to vest as of December 31, 2021 (in USD per share) $ 1.00  
Weighted- average remaining contractual life (years) 2 years 2 months 12 days 1 year 10 months 24 days
Options exercisable, weighted-average remaining contractual life 3 years 1 month 6 days  
Options expected to vest, weighted-average remaining contractual life 2 years 2 months 12 days  
Aggregate intrinsic value ($M) $ 5.7 $ 6.8
Options exercisable, aggregate intrinsic value 0.2  
Options expected to vest, aggregate intrinsic value $ 5.2