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INCOME TAXES: - Other (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Income Taxes |  |  |
Peruvian special mining tax |  | $ 25.8 | $ 22.3
Changes in unrecognized tax benefits |  |  |
Unrecognized tax benefits, opening balance |  | 214.5 |
Decreases related to settlements with taxing authorities | $ 145.0 |  |
Unrecognized tax benefits, ending balance | 69.5 | 69.5 |
Peru |  |  |
Income Taxes |  |  |
Royalty charges |  | 31.7 | $ 24.2
Changes in unrecognized tax benefits |  |  |
Unrecognized tax benefits, ending balance | 0.0 | 0.0 |
Mexico |  |  |
Changes in unrecognized tax benefits |  |  |
Unrecognized tax benefits, ending balance | $ 0.0 | $ 0.0 |

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