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Business combinations - Schedule of Acquisitions, PRA Acquisition (Details) - USD ($)
Dec. 31, 2021
Jul. 01, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill $ 9,037,931,000   $ 936,257,000 $ 883,170,000
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   177,345,000    
Goodwill   8,120,006,000    
Intangible assets   4,886,000,000    
Deferred tax assets   28,099,000    
Other assets   35,391,000    
Accounts payable   (50,259,000)    
Accrued expenses and other current liabilities   (380,342,000)    
Current portion of operating lease liabilities   (36,625,000)    
Unearned revenue   (739,278,000)    
Non-current portion of operating lease liabilities   (144,403,000)    
Deferred tax liabilities   (1,126,952,000)    
Other non-current liabilities   (203,297,000)    
Net assets acquired   12,041,971,000    
Goodwill, expected tax deductible amount   $ 0