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Finance income and expenses - Finance income (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Finance income and expenses      
Interest income on debt instruments measured at amortized cost $ 60.1 $ 7.0 $ 1.9
Interest income on debt instruments at fair value through other comprehensive income 24.0 0.3  
Gain from repurchase of debt     6.2
Net foreign currency exchange rate differences 46.8 11.5  
Total finance income $ 130.9 $ 18.8 $ 8.1