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Accounting Policies - Cash and Cash Equivalents (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
U.S. dollar |  |
Cash and Cash Equivalents and Temporary Investments |  |
Average yield for cash equivalents and temporary investments | 0.38% | 2.20%
Mexican peso |  |
Cash and Cash Equivalents and Temporary Investments |  |
Average yield for cash equivalents and temporary investments | 5.40% | 8.09%

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