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Subsequent events - Narrative (Details) - Philips Pharma Solutions (formerly BioTel Research, LLC) - Subsequent event $ in Millions	Oct. 02, 2023 USD ($)
Business Acquisition [Line Items]
Percentage of share capital acquired	100.00%
Business combination, consideration transferred	$ 68.1

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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