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Impairment and restructuring charges - Narrative (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 31, 2024 employee | May 31, 2024 employee positions | Aug. 31, 2023 employee | Jan. 31, 2023 employee | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  | $ 0.0 | $ 27.2 | $ 0.0 | $ 27.2 | $ 27.2
January 2023 Restructuring Plan |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Workforce reduction | employee |  |  |  | 125 |  |  |  |  |
Restructuring charges incurred since inception |  |  |  |  | 9.3 |  | 9.3 |  |
August 2023 Restructuring Plan |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Workforce reduction | employee |  |  | 400 |  |  |  |  |  |
Restructuring charges incurred since inception |  |  |  |  | 19.4 |  | 19.4 |  |
May 2024 Restructuring Plan |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Workforce reduction | employee |  | 300 |  |  |  |  |  |  |
Restructuring charges incurred since inception |  |  |  |  | 18.2 |  | 18.2 |  |
Number of currently vacant positions eliminated | positions |  | 85 |  |  |  |  |  |  |
August 2024 Restructuring Plan |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Workforce reduction | employee | 70 |  |  |  |  |  |  |  |
Restructuring charges incurred since inception |  |  |  |  | $ 2.5 |  | $ 2.5 |  |

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