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Stated capital (Details) - USD ($) shares in Thousands, $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Disclosure of classes of share capital [line items] |  |  |  |  |
Beginning Balance, Number of shares |  | 333,441 |  |  |
Shares issued on exercise of options (in shares) |  | 2,080 |  |  |
Ending Balance, Number of shares |  | 335,521 |  |  |
Beginning balance, Equity | [1] | $ (314.4) | [2] | $ 328.7 |
Ending balance, Equity |  | 38.1 |  | (284.7) | [1]
Stated capital net of issue costs |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Beginning balance, Equity | [1] | 5,403.1 |  | 5,394.8 |
Shares issued on exercise of options |  | 16.6 |  | 4.8 |
Ending balance, Equity |  | 5,419.7 |  | $ 5,399.6 | [1]
Share capital |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Beginning balance, Equity |  | 101.0 |  |  |
Shares issued on exercise of options |  | 0.7 |  |  |
Ending balance, Equity |  | 101.7 |  |  |
Share capital net of issue costs |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Beginning balance, Equity |  | 100.0 |  |  |
Shares issued on exercise of options |  | 0.7 |  |  |
Ending balance, Equity |  | 100.7 |  |  |
Share premium |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Beginning balance, Equity |  | 5,333.0 |  |  |
Shares issued on exercise of options |  | 15.9 |  |  |
Ending balance, Equity |  | 5,348.9 |  |  |
Share premium net of issue costs |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Beginning balance, Equity |  | 5,303.1 |  |  |
Shares issued on exercise of options |  | 15.9 |  |  |
Ending balance, Equity |  | $ 5,319.0 |  |  |
[1] | Attributable to owners of the Company
[2] | September 30,

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