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Finance Costs (Tables) | 12 Months Ended
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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 |

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