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Employee benefit plans - Schedule of Defined Contribution Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Defined contribution plans, contributed amount | $ 34,844 | $ 36,830 | $ 75,585 | $ 73,764
India |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Defined contribution plans, contributed amount | 15,197 | 15,534 | 30,321 | 29,876
U.S. |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Defined contribution plans, contributed amount | 4,680 | 4,583 | 10,381 | 10,101
U.K. |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Defined contribution plans, contributed amount | 2,673 | 4,482 | 10,120 | 9,065
China |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Defined contribution plans, contributed amount | 7,616 | 7,372 | 15,104 | 14,770
Other regions |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Defined contribution plans, contributed amount | $ 4,678 | $ 4,859 | $ 9,659 | $ 9,952

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