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Segment analysis - Reconciliation of [profit/(loss)] for the period to Adjusted EBITDA (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Segment analysis |  |  |  |
Profit/Loss for the period | $ 5 | $ 2 |  | $ (10)
Income tax charge/(credit) | 10 | 2 | $ 6 | (7)
Net finance expense | 67 | 51 | 117 | 86
Depreciation and amortization | 114 | 113 | 225 | 222
Exceptional operating items | 14 | 10 | 17 | 21
Adjusted EBITDA | $ 210 | $ 178 | $ 365 | $ 312

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