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Finance Costs - Summary of Finance Costs (Detail) $ in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2021 TWD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 TWD ($)
Material income and expense [abstract]
Interest expense, Corporate bonds	$ 1,798.3		$ 388.7
Lease liabilities	96.9		128.4
Interest expense, Bank loans	11.1		414.2
Interest expense, Others	0.2		8.4
Finance costs	$ 1,906.5	$ 68.3	$ 939.7

X

- Definition

The amount of costs associated with financing activities of the entity.

+ References

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- Definition

The amount of interest expense on bonds issued. [Refer: Interest expense; Bonds issued]

+ References

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- Definition

The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings]

+ References

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- Definition

The amount of interest expense on lease liabilities. [Refer: Lease liabilities]

+ References

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- Definition

The amount of interest expense on other financial liabilities. [Refer: Interest expense; Other financial liabilities]

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No definition available.

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