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Intangible assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Total cost	$ 5,108,465	$ 5,081,381
Accumulated amortization	(600,012)	(370,538)
Net book value	4,508,453	4,710,843
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Total cost	4,076,062	4,056,642
Order backlog
Finite-Lived Intangible Assets [Line Items]
Total cost	536,685	528,022
Trade names & brands
Finite-Lived Intangible Assets [Line Items]
Total cost	204,604	204,685
Patient database
Finite-Lived Intangible Assets [Line Items]
Total cost	170,274	170,525
Technology assets
Finite-Lived Intangible Assets [Line Items]
Total cost	$ 120,840	$ 121,507

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
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-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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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