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Business combinations - Schedule of PRA Health Sciences Inc Acquisition (Details) - USD ($)
Sep. 30, 2021
Jul. 01, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill $ 8,935,212,000   $ 936,257,000 $ 883,170,000
PRA Health Sciences Inc        
Business Acquisition [Line Items]        
Cash & cash equivalents   $ 259,971,000    
Accounts receivable and unbilled revenue   934,308,000    
Other current assets   110,691,000    
Fixed assets, net   162,988,000    
Operating lease right-of-use assets   192,345,000    
Goodwill   8,013,878,000    
Intangible assets, net   4,875,000,000    
Deferred tax assets   172,229,000    
Other assets   35,094,000    
Accounts payable   (50,259,000)    
Accrued expenses and other current liabilities   (342,552,000)    
Current lease liabilities   (38,371,000)    
Unearned revenue   (758,901,000)    
Non-current lease liabilities   (157,658,000)    
Non-current deferred tax liability   (1,313,599,000)    
Other non-current liabilities   (53,193,000)    
Net assets acquired   12,041,971,000    
Goodwill expected to be tax deductible   $ 0