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Notes and Accounts Receivable, Net - Movements of Allowance for Doubtful Receivables (Detail) - TWD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]      
Beginning balance $ 246.6 $ 325.3 $ 7.3
Reversal/Write-off 100.4 (78.5) 318.2
Effect of exchange rate changes   (0.2) (0.2)
Ending balance $ 347.0 $ 246.6 $ 325.3