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Business Combinations - Schedule of Acquisitions, PRA Acquisition (Details) - USD ($)
 18 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Jul. 01, 2021
Dec. 31, 2020
Business Acquisition [Line Items]        
Goodwill $ 8,971,670,000 $ 9,037,931,000   $ 936,257,000
PRA Health Sciences, Inc        
Business Acquisition [Line Items]        
Cash and cash equivalents     $ 259,971,000  
Accounts receivable and unbilled revenue     934,308,000  
Other current assets     125,156,000  
Fixed assets     156,851,000  
Operating lease right-of-use assets     180,601,000  
Goodwill     8,084,314,000  
Intangible assets     4,919,000,000  
Deferred tax assets     25,190,000  
Other assets     33,928,000  
Accounts payable     (50,259,000)  
Accrued expenses and other current liabilities     (380,048,000)  
Current portion of operating lease liabilities     (36,506,000)  
Unearned revenue     (739,278,000)  
Non-current portion of operating lease liabilities     (147,204,000)  
Deferred tax liabilities     (1,119,762,000)  
Other non-current liabilities     (204,291,000)  
Net assets acquired     12,041,971,000  
Goodwill, expected tax deductible amount     $ 0  
Cash and cash equivalents $ 0