XML 142 R120.htm IDEA: XBRL DOCUMENT v3.21.1
Guarantee Deposits - Summary of Guarantee Deposits (Detail)
$ in Millions, $ in Millions
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Guarantee deposits [abstract]      
Capacity guarantee     $ 1,499.4
Others $ 350.0   230.5
Guarantee deposits 350.0   1,729.9
Current portion (classified under accrued expenses and other current liabilities) 84.4   1,553.0
Noncurrent portion 265.6 $ 9.5 176.9
Guarantee deposits $ 350.0   $ 1,729.9