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Commitments and contingencies - Lease Balances (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]    
Operating lease right-of-use assets $ 21.5 $ 22.8
Total lease liability $ 24.2 $ 24.5
Weighted average lease term (years) 5 years 5 years 2 months 12 days
Weighted average discount rate 3.00% 3.00%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities