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Summary of significant accounting policies - Deferred Contract Costs and Cloud Computing Arrangements (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Accounting Policies [Abstract]        
Total amortization of contract costs $ 7,800,000 $ 6,900,000 $ 23,100,000 $ 19,800,000
Impairment losses 0 0 0 0
Amortization expense related to capitalized CCA implementation costs $ 1,600,000 $ 1,100,000 $ 4,815,000 $ 1,065,000