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Financial instruments fair value - Narrative (Details) - Convertible Senior Notes Due 2026 - Convertible Debt - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 17, 2021
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Principal amount |  |  | $ 373.8
Debt issuances costs capitalized | $ 7.4 | $ 9.2 |

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