Summary of significant accounting policies - Deferred Contract Costs and Cloud Computing Arrangements (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Accounting Policies [Abstract]
Total amortization of contract costs	$ 7,900,000	$ 6,600,000	$ 15,300,000	$ 12,900,000
Impairment losses	0	$ 0	0	0
Amortization expense related to capitalized CCA implementation costs	$ 1,600,000		$ 3,210,000	$ 0