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INCOME AND MINING TAXES - Tax Cuts and Jobs Act (the "Act") and Tax Reform (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
INCOME TAXES |  |  |  |  |
Statutory tax rate (as a percent) |  |  | 21.00% | 21.00% | 35.00%
Tax Cuts and Jobs Act of 2017 measurement period adjustment |  |  |  |  | $ 28.0
Taxable income offset by non-operating losses |  |  |  | $ 13.6 |
Argentina |  |  |  |  |
INCOME TAXES |  |  |  |  |
Statutory tax rate (as a percent) |  |  | 30.00% |  | 35.00%
Forecast | Argentina |  |  |  |  |
INCOME TAXES |  |  |  |  |
Statutory tax rate (as a percent) | 25.00% | 25.00% |  |  |

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