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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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