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Finance income and expenses - Finance expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Finance income and expenses      
Interest expenses $ 224.8 $ 168.9 $ 150.4
Adjustments to financial liabilities in respect estimated cashflows and repayments [1] 5.1 3.9 22.0
Loss reclassified on derecognition of investment in debt instruments at fair value through other comprehensive income 2.6    
Net foreign currency exchange rate differences     13.6
Impairment losses on trade and other receivables 6.9 2.8 3.3
Total finance expenses 239.4 $ 175.6 $ 189.3
Adjustments for increase (decrease) in financial liabilities held for trading $ 5.0    
[1] In 2022, includes US$ 5 million expense in respect of the early repayment of Tranche-E (see also Note 1(b)).