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Financial risk management - Exposure to currency risk (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
EXPOSURE TO CURRENCY RISK |  |  |
Cash and cash equivalents | $ 200.8 | $ 481.5 | $ 186.3
Deferred tax liability | (66.8) | (69.6) |
Reclamation and closure cost obligations | (121.2) | (160.2) | $ (119.2)
Canadian dollar | Currency risk |  |  |
EXPOSURE TO CURRENCY RISK |  |  |
Cash and cash equivalents | 33.9 | 35.1 |
Trade and other receivables | 10.4 | 6.5 |
Investments | 35.6 | 59.3 |
Income tax receivable (payable) | (0.4) | 0.5 |
Trade and other payables | (128.6) | (96.0) |
Deferred tax liability | (66.8) | (69.6) |
Reclamation and closure cost obligations | (119.5) | (154.5) |
Share units | (1.8) | (3.7) |
Total exposure to currency risk | (237.2) | (222.4) |
Mexican peso | Currency risk |  |  |
EXPOSURE TO CURRENCY RISK |  |  |
Cash and cash equivalents | 0.0 | 0.6 |
Trade and other receivables | 0.4 | 1.9 |
Investments | 0.0 | 0.0 |
Income tax receivable (payable) | 0.0 | 2.6 |
Trade and other payables | (1.3) | (2.7) |
Deferred tax liability | 0.0 | 0.0 |
Reclamation and closure cost obligations | 0.0 | (0.1) |
Share units | 0.0 | 0.0 |
Total exposure to currency risk | $ (0.9) | $ 2.3 |

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