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Financial risk management - Exposure to currency risk (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
EXPOSURE TO CURRENCY RISK |  |  |
Cash and cash equivalents | $ 481.5 | $ 186.3 | $ 83.4
Deferred tax liability | (69.6) | (53.5) |
Reclamation and closure cost obligations | (160.2) | (119.2) | $ (107.0)
Canadian dollar | Currency risk |  |  |
EXPOSURE TO CURRENCY RISK |  |  |
Cash and cash equivalents | 35.1 | 34.6 |
Trade and other receivables | 6.5 | 53.5 |
Investments | 59.3 |  |
Income tax receivable | 0.5 | (0.7) |
Trade and other payables | (96.0) | (80.1) |
Deferred tax liability | (69.6) | (53.5) |
Reclamation and closure cost obligations | (154.5) | (113.3) |
Share units | (3.7) | (10.9) |
Total exposure to currency risk | (222.4) | (170.4) |
Mexican peso | Currency risk |  |  |
EXPOSURE TO CURRENCY RISK |  |  |
Cash and cash equivalents | 0.6 | 0.1 |
Trade and other receivables | 1.9 | 1.6 |
Investments | 0.0 |  |
Income tax receivable | 2.6 | 4.1 |
Trade and other payables | (2.7) | (6.5) |
Deferred tax liability | 0.0 | 0.0 |
Reclamation and closure cost obligations | (0.1) | (0.3) |
Share units | 0.0 | 0.0 |
Total exposure to currency risk | $ 2.3 | $ (1.0) |

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