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Derivative financial instruments - Fair value (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Derivatives |  |
Derivative financial instruments |  |
Derivative financial instruments at fair value | $ 64.2 | $ 19.2
Embedded options within listed bonds |  |
Derivative financial instruments |  |
Derivative financial instruments at fair value | $ 64.2 | 29.4
Foreign exchange swaps |  |
Derivative financial instruments |  |
Derivative financial instruments at fair value |  | $ (10.2)

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