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Contingencies and Commitments (Unaudited) - Other Matters (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2021
Sep. 30, 2020
Loss Contingencies [Line Items]          
Remediation liability   $ 308.0   $ 308.0  
Settlement Liabilities, Current   130.0   130.0  
Subsequent event          
Loss Contingencies [Line Items]          
Estimated Construction Costs $ 2,800.0        
PT Smelting | PT Freeport Indonesia          
Loss Contingencies [Line Items]          
Administrative fine   $ 3.0 $ 13.0 $ 16.0 $ 149.0