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Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Total cost	$ 5,081,381	$ 200,011
Accumulated amortization	(370,538)	(133,551)
Net book value	4,710,843	66,460
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Total cost	4,056,642	144,251
Order backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Total cost	528,022	39,269
Trade names & brands
Acquired Finite-Lived Intangible Assets [Line Items]
Total cost	204,685	2,766
Patient database
Acquired Finite-Lived Intangible Assets [Line Items]
Total cost	170,525	2,552
Technology assets
Acquired Finite-Lived Intangible Assets [Line Items]
Total cost	$ 121,507	$ 11,173

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
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