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Share-based Compensation (Details 4) - Restricted share units
$ / shares in Units, $ in Millions
Dec. 31, 2021
USD ($)
$ / shares
shares
2009 Plan and 2019 Plan  
Share based Compensation  
Aggregate intrinsic value of RSUs outstanding | $ $ 1,322.7
Company's closing stock price per ADS used to calculate intrinsic value | $ / shares $ 101.78
2019 Plan  
Share based Compensation  
Number of shares available for future grant | shares 282,261,685