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Significant judgments, estimates and assumptions (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2020
Subsidiaries |  |  |
Impairment loss recognised in profit or loss | $ 271.7 | $ 271.7 | $ 262.1
The Mineral Resource Company II, LLC |  |  |
Subsidiaries |  |  |
Proportion of ownership interest in subsidiary |  |  | 49.90%
The Mineral Resource Company II, LLC | Bottom |  |  |
Subsidiaries |  |  |
Distributions received (as a percent) |  |  | 50.00%
The Mineral Resource Company II, LLC | Top |  |  |
Subsidiaries |  |  |
Distributions received (as a percent) |  |  | 75.00%

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