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INCOME TAXES: - Carryforward (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Foreign tax credits |  |  |  |
Other U.S. tax credits | $ 0.0 |  |  |
Unrecognized Tax Benefits | $ 58.4 | $ 214.5 | $ 214.5 | $ 304.0
Income Tax Rate (as a percent) | 21.00% | 21.00% | 35.00% |
Mexico |  |  |  |
Foreign tax credits |  |  |  |
Unrecognized Tax Benefits | $ 0.0 |  |  |
Income Tax Rate (as a percent) | 30.00% | 30.00% | 30.00% |
Peru |  |  |  |
Foreign tax credits |  |  |  |
Income Tax Rate (as a percent) | 29.50% | 29.50% | 29.50% |
Foreign |  |  |  |
Foreign tax credits |  |  |  |
Tax credits carryback period | 1 year |  |  |
Tax credits carryforward period | 10 years |  |  |
Increase in foreign tax credits | $ 15.9 |  |  |
Unrecognized Tax Benefits | 58.4 |  |  |
Foreign tax credit carryforward | 790.2 |  |  |
Foreign tax credit carryforward net of unrecognized tax benefit | 731.8 |  |  |
2024 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | 39.4 |  |  |
2025 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | 102.0 |  |  |
2026 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | 189.5 |  |  |
2027 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | 105.6 |  |  |
2028 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | 159.6 |  |  |
2030 | Foreign |  |  |  |
Foreign tax credits |  |  |  |
Foreign tax credit carryforward | $ 194.1 |  |  |

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