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Capital risk management - Schedule of capital (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
CAPITAL RISK MANAGEMENT [Abstract] |  |  |
Equity | $ 959.5 | $ 955.9 |
Long-term debt | 394.9 | 491.0 |
Gross Capital | 1,354.4 | 1,446.9 |
Cash and cash equivalents | (200.8) | (481.5) | $ (186.3)
Total | $ 1,153.6 | $ 965.4 |

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