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Intangible assets (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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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

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