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Acquisitions - 2022 Acquisition (Details) - Busuu Online S.L. - USD ($)
$ in Millions
12 Months Ended
Jan. 13, 2022
Dec. 31, 2021
Business Acquisition [Line Items]    
Acquisition related expenses   $ 5.3
Subsequent Event    
Business Acquisition [Line Items]    
Ownership percent of stock acquired 100.00%  
Payments for contingent consideration arrangements $ 417.0  
Contingent consideration arrangements $ 25.0