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Acquisition and disposals - Impact of acquisition on net debt (Details) - USD ($) $ in Billions |  | 6 Months Ended
--- | --- | ---
Mar. 06, 2025 | Jun. 30, 2025
Disclosure of detailed information about business combination [line items] |  |
less: cash and cash equivalents acquired |  | $ (0.3)
Arcadium Lithium Plc |  |
Disclosure of detailed information about business combination [line items] |  |
Borrowings of Arcadium Lithium | $ 1.6 |
less: convertible loan notes settled on change of control | (0.4) |
less: cash and cash equivalents acquired | (0.3) |
less: loan advanced to Arcadium prior to acquisition | (0.2) |
Acquired net debt | 0.7 |
Cash payment in consideration of equity to shareholders of Arcadium Lithium plc | 6.3 |
Cash payment to settle convertible loan notes | 0.4 |
Change in net debt on acquisition | $ 7.4 |

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