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Long-Term Bank Loans - Summary of Loans and Bonds Payable (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($)
Disclosure of detailed information about borrowings [line items] |  |
Long-term bank loans | $ 1,967.6 | $ 70.1
Long-term bank loans [member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Unsecured loans | 2,000.0 |
Less: Discounts on government grants | (32.4) |
Long-term bank loans | $ 1,967.6 |
Annual interest rate | 0.40% | 0.40%
Maturity date | September 2025 |

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