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Dispositions (Oil and Gas Operations) (Details) - USD ($) $ in Millions |  |  | 6 Months Ended
--- | --- | --- | ---
Mar. 17, 2017 | Jun. 17, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net gain on sales of assets |  |  | $ (33.0) | $ (749.0)
Proceeds from sales |  |  | 0.0 | $ 996.0
Freeport-McMoRan Oil & Gas | Elk Petroleum [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Net gain on sales of assets |  |  | $ (17.0) |
Proceeds from sales | $ 17.5 |  |  |
Freeport-McMoRan Oil & Gas | Black Stone Minerals, L.P. [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sales |  | $ 102.0 |  |

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