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Summary of Significant accounting policies - Estimated Useful Lives of Intangible Assets (Details)	Dec. 31, 2023
Customer relationships | Minimum
Indefinite-lived Intangible Assets [Line Items]
Amortization period	16 years
Customer relationships | Maximum
Indefinite-lived Intangible Assets [Line Items]
Amortization period	23 years
Order backlog
Indefinite-lived Intangible Assets [Line Items]
Amortization period	3 years
Trade names & brands
Indefinite-lived Intangible Assets [Line Items]
Amortization period	3 years
Patient database
Indefinite-lived Intangible Assets [Line Items]
Amortization period	7 years
Technology assets
Indefinite-lived Intangible Assets [Line Items]
Amortization period	5 years

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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