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Finance Costs (Tables)
 12 Months Ended
Dec. 31, 2020
Text Block [Abstract]  
Summary of Finance Costs
   
Years Ended December 31
 
   
2018
   
2019
   
2020
 
   
NT$
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
   
(In Millions)
 
Interest expense
      
Corporate bo
n
ds
  $1,633.8   $1,139.9   $1,337.3 
Bank loans
   1,417.3    1,869.4    500.9 
Lease liabilities
   —    240.9    227.8 
Others
   0.1    0.7    15.5 
  
 
 
   
 
 
   
 
 
 
  $3,051.2   $3,250.9   $2,081.5