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Income taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Tax Credit Carryforward [Line Items]      
Additional valuation allowance amount $ 7.9    
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, amount 7.9 $ 2.1 $ (9.8)
Undistributed earnings of certain foreign subsidiaries 27.7 0.0  
Unrecognized deferred income tax liability 8.1    
Penalties and interest accrued related to income tax liabilities 5.0 4.6  
Reasonably possible decrease in amount of unrecognized tax benefits 1.3    
Utilization of tax attributes, annual limitation 70.6    
Utilization of tax attributes, cumulative limitation $ 405.0    
Foreign Tax Jurisdiction      
Tax Credit Carryforward [Line Items]      
Effective income tax rate reconciliation, change in deferred tax assets valuation allowance, amount   $ 2.1