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Income taxes - Effective Tax Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Effective income tax rate | (1.10%) | (1.70%) | (1.10%) | (1.30%)
Enacted tax rate |  |  | 25.80% |
U.S |  |  |  |
Deferred tax expense | $ 0.5 | $ 0.9 | $ 0.9 | $ 1.6

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