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Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Summary of Significant Transactions between the Company and Other Related Parties |
| b. | Net revenue
|  |  |  | Years Ended December 31 |
|  |  |  | 2016 |  |  | 2017 |  |  | 2018 |
|  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Item |  | Related Party Categories |  |  |  |  |  |  |  |  |  |  |  |
Net revenue from sale of goods |  | Associates |  | $ | 5,929.1 |  |  | $ | 8,496.0 |  |  | $ | 8,980.1 |
|  | Other related parties |  |  | — |  |  |  | 0.1 |  |  |  | 0.3 |
|  |  |  | $ | 5,929.1 |  |  | $ | 8,496.1 |  |  | $ | 8,980.4 |
Net revenue from royalties |  | Associates |  | $ | 516.7 |  |  | $ | 482.5 |  |  | $ | 362.3 |
| c. | Purchases
|  |  |  | Years Ended December 31 |
|  |  |  | 2016 |  |  | 2017 |  |  | 2018 |
|  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Related Party Categories |  |  |  |  |  |  |  |  |  |  |  |  |  |
Associates |  |  |  | $ | 10,108.2 |  |  | $ | 9,904.6 |  |  | $ | 8,809.5 |
| d. | Receivables from related parties
|  | December 31, 2017 |  |  | December 31, 2018 |
|  |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |
Item |  | Related Party Name/Categories |  |  |  |  |  |  |  |
Receivables from related parties |  | GUC |  | $ | 1,022.9 |  |  | $ | 481.9 |
|  | Xintec |  |  | 161.2 |  |  |  | 102.5 |
|  |  |  | $ | 1,184.1 |  |  | $ | 584.4 |
Other receivables from related parties |  | SSMC |  | $ | 83.1 |  |  | $ | 53.8 |
|  | VIS |  |  | 78.2 |  |  |  | 10.4 |
|  | Other Associates |  |  | 9.8 |  |  |  | 0.8 |
|  |  |  | $ | 171.1 |  |  | $ | 65.0 |
| e. | Payables to related parties
|  | December 31, 2017 |  |  | December 31, 2018 |
|  |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |
Item |  | Related Party Name/Categories |  |  |  |  |  |  |  |
Payables to related parties |  | Xintec |  | $ | 817.9 |  |  | $ | 649.8 |
|  | SSMC |  |  | 407.0 |  |  |  | 362.6 |
|  | VIS |  |  | 410.0 |  |  |  | 357.1 |
|  | Other Associates |  |  | 21.5 |  |  |  | 7.0 |
|  |  |  | $ | 1,656.4 |  |  | $ | 1,376.5 |
| f. | Others
|  | Years Ended December 31 |
|  | 2016 |  |  | 2017 |  |  | 2018 |
|  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Item |  | Related Party Categories |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing expenses |  | Associates |  | $ | 1,389.2 |  |  | $ | 2,196.1 |  |  | $ | 2,974.6 |
Research and development expenses |  | Associates |  | $ | 161.7 |  |  | $ | 69.8 |  |  | $ | 83.1 |
General and administrative expenses |  | Other related parties |  | $ | 60.0 |  |  | $ | 101.5 |  |  | $ | 120.8 |
Compensation to Directors and Other Key Management Personnel | The compensation to directors and other key management personnel for the years ended December 31, 2016, 2017 and 2018 were as follows:
|  |  |  | Years Ended December 31 |
|  |  |  | 2016 |  |  | 2017 |  |  | 2018 |
|  |  |  | NT$ (In Millions) |  |  | NT$ (In Millions) |  |  | NT$ (In Millions) |
Short-term employee benefits |  |  |  | $ | 2,024.0 |  |  | $ | 2,170.3 |  |  | $ | 2,004.9 |
Post-employment benefits |  |  |  |  | 4.0 |  |  |  | 3.7 |  |  |  | 3.4 |
|  |  |  | $ | 2,028.0 |  |  | $ | 2,174.0 |  |  | $ | 2,008.3 |

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