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Intangible Assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Acquired Finite-Lived Intangible Assets [Line Items]    
Total cost $ 5,147,971 $ 5,109,212
Accumulated amortization (1,292,106) (830,553)
  Net book value 3,855,865 4,278,659
Customer relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total cost 4,090,393 4,076,435
Order backlog    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total cost 541,302 536,934
Trade names & brands    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total cost 204,653 204,621
Patient database    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total cost 170,366 170,238
Technology assets    
Acquired Finite-Lived Intangible Assets [Line Items]    
Total cost $ 141,257 $ 120,984