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Summary of significant accounting policies - Strategic Investments (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Accounting Policies [Abstract]            
Balance of strategic investments $ 7.7     $ 7.7   $ 5.4
Impairment loss on investment   $ 0.9        
Changes in carrying value of strategic investments $ 0.0   $ 0.0 $ 0.0 $ 0.0