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Financial Instruments (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 29, 2020 | Jul. 31, 2015 USD ($) shares | Dec. 31, 2020 MXN ($) $ / shares | Dec. 31, 2019 $ / shares | Dec. 31, 2018 $ / shares | Dec. 31, 2010 USD ($)
Financial Instruments |  |  |  |  |  |
Principal amount |  |  | $ 123,877,278,000 |  |  |
UHI |  |  |  |  |  |
Financial Instruments |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 1,063.1
UHI | Warrants issued by UHI |  |  |  |  |  |
Financial Instruments |  |  |  |  |  |
Principal amount |  | $ 1,125.0 |  |  |  |
Warrants exercisable for UHI's common stock | shares |  | 4,858,485 |  |  |  |
Warrants exercised | shares |  | 267,532 |  |  |  |
Stock spot price | $ / shares |  |  | $ 190 | $ 390 | $ 387 |
Expected volatility rate |  |  | 64.00% | 40.00% | 36.00% |
Minimum | UHI | Warrants issued by UHI |  |  |  |  |  |
Financial Instruments |  |  |  |  |  |
Equity stake | 10.00% | 7.80% |  |  |  |
Minimum | UHI | Warrants issued by UHI | Weighted average cost of capital |  |  |  |  |  |
Financial Instruments |  |  |  |  |  |
Weighted average cost of capital |  |  | 8 |  |  |
Exit multiple |  |  | 8 |  |  |
Maximum | UHI | Warrants issued by UHI |  |  |  |  |  |
Financial Instruments |  |  |  |  |  |
Equity stake | 35.90% | 10.00% |  |  |  |
Maximum | UHI | Warrants issued by UHI | Weighted average cost of capital |  |  |  |  |  |
Financial Instruments |  |  |  |  |  |
Weighted average cost of capital |  |  | 9 |  |  |
Exit multiple |  |  | 9 |  |  |

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