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General Information (Unaudited) (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 01, 2021 | Apr. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | May 01, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Proceeds from sale of receivables, gross |  |  | $ 131.0 | $ 319.0 |  |
Discount on receivables sold |  |  | 1.0 | 1.0 |  |
Payments to Acquire Equity Method Investments |  |  |  | $ 33.0 | $ 0.0 |
Freeport Cobalt |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Consideration | $ 208.0 |  |  |  |  |
Cash proceeds from divestiture of businesses | 173.0 |  |  |  |  |
Disposal group cash and cash equivalents | 20.0 |  |  |  |  |
Disposal group other assets | 125.0 |  |  |  |  |
Gain on divestiture |  |  | 60.0 |  |  |
Contingent consideration, asset | $ 40.0 |  |  |  |  |
Net Income Attributable to Common Stock | Freeport Cobalt |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Gain on divestiture |  |  | $ 34.0 |  |  |
PT Smelting |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Business acquisition, percent of common stock acquired |  | 14.50% |  |  |  |
Payments to Acquire Equity Method Investments |  | $ 33.0 |  |  |  |
PT Smelting |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Equity method investment, percentage ownership |  | 25.00% |  |  |  | 39.50%
Jervois |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Divestiture of business, percent of shares owned | 700.00% |  |  |  |  |
Part noncash divestiture, consideration received | $ 35.0 |  |  |  |  |
Koboltti Chemicals Holdings Limited |  |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent | 56.00% |  |  |  |  |

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