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Income taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Line Items]            
Effective annual tax rate           4.00%
Discrete tax expense (benefit) $ 1.0 $ (9.0) $ 1.0 $ (7.3)    
Forecast            
Income Taxes [Line Items]            
Effective annual tax rate         (5.00%)  
Valuation allowance, deferred tax asset, increase, amount         $ 163.1