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Hedging Financial Instruments - Summary of hedging financial instruments (Detail) - TWD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial assets- current |  |
Financial assets current | $ 13.5 | $ 0.1
Fair value hedges [member] | Interest rate futures contracts [member] |  |
Financial assets- current |  |
Financial assets current |  | 0.1
Financial liabilities- current |  |
Financial liabilities current | 9.6 | $ 1.2
Cash flow hedges [member] | Forward Interest Rate Contracts [Member] |  |
Financial assets- current |  |
Financial assets current | $ 13.5 |

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