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Commitments and contingencies - Future minimum rental commitments (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]    
Remainder of 2023 $ 4.1  
2024 5.8  
2025 4.5  
2026 3.7  
2027 and thereafter 9.6  
Total future annual minimum rental payments 27.7  
Less: present value discount (2.0)  
Total lease liability $ 25.7 $ 30.3