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Accounting Policies - Cash and Cash Equivalents (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
U.S. dollar |  |
Cash and Cash Equivalents and Temporary Investments |  |
Yield on cash and cash equivalents (as percent) | 0.07% | 0.38%
Mexican peso |  |
Cash and Cash Equivalents and Temporary Investments |  |
Yield on cash and cash equivalents (as percent) | 4.36% | 5.40%

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