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REVERSALS OF IMPAIRMENT CHARGES - NET - Property, plant and equipment (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Impairment charges |  |  |
Property, plant and equipment | $ (48.3) |  |
Accumulated depreciation, depletion, amortization and impairment |  |  |
Impairment charges |  |  |
Property, plant and equipment (i) |  | $ (689.0) | $ (361.8)
Inventories (ii) |  | 38.1 |
Kinross Brasil Mineracao S.A. |  |  |
Impairment charges |  |  |
Tax expense(recovery) on impairment charge |  |  | 68.2
Carrying amounts of property, plant and equipment |  |  | 1,461.0
Kinross Brasil Mineracao S.A. | Accumulated depreciation, depletion, amortization and impairment |  |  |
Impairment charges |  |  |
Property, plant and equipment (i) |  |  | (200.7)
Tasiat Mauritamie Ltd. S.A |  |  |
Impairment charges |  |  |
Tax expense(recovery) on impairment charge |  | 0.0 | 0.0
Carrying amounts of property, plant and equipment |  | 2,455.7 | 2,123.6
Tasiat Mauritamie Ltd. S.A | Accumulated depreciation, depletion, amortization and impairment |  |  |
Impairment charges |  |  |
Property, plant and equipment (i) |  | (299.5) | $ (161.1)
Chirano Gold Mines Ltd. |  |  |
Impairment charges |  |  |
Tax expense(recovery) on impairment charge |  | 71.6 |
Carrying amounts of property, plant and equipment |  | 240.3 |
Chirano Gold Mines Ltd. | Accumulated depreciation, depletion, amortization and impairment |  |  |
Impairment charges |  |  |
Property, plant and equipment (i) |  | (204.5) |
Lobo-Marte Mine |  |  |
Impairment charges |  |  |
Tax expense(recovery) on impairment charge |  | 4.6 |
Carrying amounts of property, plant and equipment |  | 319.2 |
Lobo-Marte Mine | Accumulated depreciation, depletion, amortization and impairment |  |  |
Impairment charges |  |  |
Property, plant and equipment (i) |  | $ (185.0) |

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