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Long-term debt - Schedule of borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Non-current portion of non-current borrowings, by type [abstract]    
Total long-term debt $ 396.0 $ 394.9
Senior unsecured notes - due July 15, 2027    
Non-current portion of non-current borrowings, by type [abstract]    
Total long-term debt 396.0 394.9
Credit Facility    
Non-current portion of non-current borrowings, by type [abstract]    
Total long-term debt $ 0.0 $ 0.0