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Commitments and Contingencies - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2017
Dec. 31, 2019
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2022
Dec. 31, 2021
Jan. 17, 2020
Oct. 31, 2018
Indemnification Agreement                    
Loss Contingencies [Line Items]                    
Liabilities recorded     $ 0              
Securities Class Actions                    
Loss Contingencies [Line Items]                    
Legal expense, net of amounts directly covered by insurance   $ 100,000,000.0                
Securities Class Actions | Pending Litigation                    
Loss Contingencies [Line Items]                    
Loss contingency, expected settlement amount                 $ 187,500,000  
Google Cloud Platform License Agreement                    
Loss Contingencies [Line Items]                    
Purchase commitment, description     The agreement has an initial term of five years and we are required to purchase at least $400.0 million of cloud services in each year of the agreement. For each of the first four years, up to 15% of this amount may be moved to a subsequent year. If we fail to meet the minimum purchase commitment during any year, we are required to pay the difference.              
Initial term of agreement 5 years                  
Minimum amount of services to be purchased in each year $ 400,000,000.0                  
Initial period required to purchase minimum amount of services 4 years                  
Google Cloud Platform License Agreement | Maximum                    
Loss Contingencies [Line Items]                    
Purchase commitment, percentage of minimum purchase requirement that can be moved to subsequent year 15.00%                  
AWS Enterprise Agreement, Cloud Services                    
Loss Contingencies [Line Items]                    
Purchase commitment, description     In March 2016, we entered into the AWS Enterprise Agreement for the use of cloud services from Amazon Web Services, Inc. (“AWS”). Under the agreement, as amended, we are committed to spend an aggregate of $1.1 billion between January 2017 and December 2022 on AWS services ($90.0 million in 2018, $150.0 million in 2019, $215.0 million in 2020, $280.0 million in 2021, and $349.0 million in 2022). If we fail to meet the minimum purchase commitment during any year, we are required to pay the difference. Any such payment may be applied to future use of AWS services during the term, although it will not count towards meeting the future minimum purchase commitments.              
Minimum purchase commitment to spend between January 2017 and December 2022                   $ 1,100,000,000
Amount of purchase commitment paid       $ 215,000,000.0 $ 150,000,000.0 $ 90,000,000.0        
AWS Enterprise Agreement, Cloud Services | Scenario Forecast                    
Loss Contingencies [Line Items]                    
Minimum purchase commitment             $ 349,000,000.0 $ 280,000,000.0