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Capital risk management - Schedule of capital (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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CAPITAL RISK MANAGEMENT [Abstract] |  |  |
Equity | $ 1,052.3 | $ 789.2 |
Long-term debt | 397.0 | 396.0 |
Gross capital | 1,449.3 | 1,185.2 |
Cash and cash equivalents | (105.2) | (185.5) | $ (200.8)
Total | $ 1,344.1 | $ 999.7 |

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