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Notes and Accounts Receivable, Net - Movements of Allowance for Doubtful Receivables (Detail) - TWD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of financial assets [line items]      
Beginning balance $ 331.6 $ 347.0 $ 246.6
Reversal/Write-off 199.9 (15.5) 100.4
Effect of exchange rate changes 0.0 0.1 0.0
Ending balance $ 531.5 $ 331.6 $ 347.0