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Income taxes - Effective Tax Rate (Details) - USD ($)
$ in Millions
3 Months Ended
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