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Contingencies and Commitments (Unaudited) - Other Matters (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021
Loss Contingencies [Line Items] |  |  |
Remediation liability |  |  | $ 313.0
Settlement Liabilities, Current |  |  | 130.0
Estimated Construction Costs | $ 2,800.0 |  |
PT Smelting | PT Freeport Indonesia |  |  |
Loss Contingencies [Line Items] |  |  |
Administrative fine |  | $ 149.0 | $ 16.0

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