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Capital risk management - Schedule of capital (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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CAPITAL RISK MANAGEMENT [Abstract] |  |  |
Equity | $ 789.2 | $ 959.5 |
Long-term debt | 396.0 | 394.9 |
Gross Capital | 1,185.2 | 1,354.4 |
Cash and cash equivalents | (185.5) | (200.8) | $ (481.5)
Total | $ 999.7 | $ 1,153.6 |

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