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Net finance expense/(income) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Net finance expense/(income)        
Senior Facilities interest expense $ 40,000,000 $ 33,000,000 $ 79,000,000 $ 66,000,000
Net pension interest cost (note 21) 1,000,000 1,000,000 2,000,000 2,000,000
Lease interest cost 6,000,000 6,000,000 12,000,000 12,000,000
(Gains) / losses on derivative financial instruments 3,000,000   8,000,000  
Other net finance expense 8,000,000 11,000,000 12,000,000 22,000,000
Net finance expense before exceptional items 59,000,000 51,000,000 115,000,000 103,000,000
Exceptional finance income (note 5) 8,000,000   2,000,000 (17,000,000)
Net finance expense/(income) $ 67,000,000 $ 51,000,000 117,000,000 86,000,000
Interest Paid Related To Lease Liabilities     $ 12,000,000 $ 12,000,000