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Income taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Income Taxes [Line Items]            
Effective annual tax rate           24.00%
Discrete tax expense (benefits) $ (10.9) $ 1.7 $ (10.3) $ 7.2    
Deferred tax assets, valuation allowance $ 19.2   $ 19.2      
Forecast            
Income Taxes [Line Items]            
Effective annual tax rate         3.00%