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Income taxes - Effective Tax Rate (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Effective income tax rate | 1.00% | (1.50%)
Enacted tax rate | 25.80% |
U.S |  |
Deferred tax (expense) / benefit | $ (0.7) |
United States and France |  |
Deferred tax (expense) / benefit |  | $ 1.2

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