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Commitments and contingencies - Narrative (Details) € in Millions, $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 EUR (€) | Sep. 30, 2023 USD ($) | Jun. 21, 2023 EUR (€) | Jun. 21, 2023 USD ($) | Aug. 03, 2022 EUR (€) | Aug. 03, 2022 USD ($) | Jun. 30, 2022 EUR (€) | Jun. 30, 2022 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  | € 40 | $ 44.0 | € 60 | $ 65.0 | € 60 | $ 65.0
Loss contingency accrual, period increase (decrease) | € 40 | $ 43.3 |  |  |  |  |  |
Iponweb |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Loss contingency accrual |  | $ 31.9 |  |  |  |  |  |

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