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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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