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Intangible assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Total cost	$ 5,071,216	$ 200,011
Accumulated amortization	(256,032)	(133,551)
Net book value	4,815,184	66,460
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Total cost	4,047,002	144,251
Order backlog
Finite-Lived Intangible Assets [Line Items]
Total cost	527,324	39,269
Trade names & brands
Finite-Lived Intangible Assets [Line Items]
Total cost	204,705	2,766
Patient database
Finite-Lived Intangible Assets [Line Items]
Total cost	170,513	2,552
Technology assets
Finite-Lived Intangible Assets [Line Items]
Total cost	$ 121,672	$ 11,173

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 http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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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
-Paragraph 1
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
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