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Income taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Line Items]            
Effective annual tax rate           29.00%
Discrete tax expense (benefits) $ 0.0 $ 0.2 $ 0.0 $ 0.6    
Forecast            
Income Taxes [Line Items]            
Effective annual tax rate         (8.00%)  
Valuation allowance, deferred tax asset, increase, amount         $ 127.5