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Income taxes - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Abstract]            
Income tax expense $ 35,747 $ 37,437 $ 33,489 $ 89,105    
Net release of provisions for uncertain tax positions     (23,400) $ 14,400    
Release of deferred tax liability, undistributed earnings of foreign subsidiaries     (29,800)      
Decrease in deferred tax benefit, amortization of intangible assets     27,000      
Unrecognized tax benefits and related interest and penalties 105,800   105,800   $ 125,800  
Unrecognized tax benefits 83,848   83,848   101,619 $ 160,016
Interest and related penalties $ 22,000   22,000   24,200  
Interest and penalties recognized as an benefit     $ 3,300      
Interest and penalties recognized as an expense         $ 1,900