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Interest-bearing loans and borrowings - Undrawn borrowing facilities (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]    
Undrawn credit line facilities $ 813.4 $ 671.3
Less than 1 year    
Disclosure of detailed information about borrowings [line items]    
Undrawn credit line facilities $ 79.0