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Other Operating Income and Expenses, Net (Tables) | 12 Months Ended
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Dec. 31, 2019
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Summary of Other Operating Income and Expenses, Net |
|  | Years Ended December 31 |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Loss on disposal or retirement of property, plant and equipment, ne t |  | $ | (1,097.9 | ) |  | $ | (1,005.6 | ) |  | $ | (950.0 | )
Reversal of impairment loss (impairment loss) on property, plant and equipment |  |  | — |  |  |  | (423.5 | ) |  |  | 301.4 |
Others |  |  | (267.6 | ) |  |  | (672.4 | ) |  |  | 152.3 |
|  | $ | (1,365.5 | ) |  | $ | (2,101.5 | ) |  | $ | (496.3 | )

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