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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Principles of consolidation (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Sociedad Contractual Minera Puren |  |
Principles of consolidation |  |
Ownership interest in joint venture | 65.00% | 65.00%
Fairbanks Gold Mining, Inc. |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Kinross Brasil Mineracao S.A. |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Compania Minera Maricunga |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Compania Minera Mantos de Oro |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Echo Bay Minerals Company |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Chukotka Mining and Geological Company |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Northern Gold LLC |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Tasiat Mauritamie Ltd. S.A |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Chirano Gold Mines Ltd. |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 90.00% | 90.00%
Chirano Gold Mines Ltd. | Ghana |  |
Principles of consolidation |  |
Ownership interest non controlling interest | 10.00% | 10.00%
KG Mining (Bald Mountain) |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Round Mountain Gold Corporation/KG Mining |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Udinsk Gold, LLC |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% |
Peak Gold, LLC |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 70.00% |

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