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Related Party Transactions (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Summary of Significant Transactions between the Company and Other Related Parties |
| b. | Net revenue
|  |  |  | Years Ended December 31 |
|  |  |  | 2015 |  |  | 2016 |  |  | 2017 |
|  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Item |  | Related Party Categories |  |  |  |  |  |  |  |  |  |  |  |
Net revenue from sale of goods |  | Associates |  | $ | 4,254.0 |  |  | $ | 5,929.1 |  |  | $ | 8,496.0 |
|  | Other related parties |  |  | — |  |  |  | — |  |  |  | 0.1 |
|  | Joint venture |  |  | 1.2 |  |  |  | — |  |  |  | — |
|  |  |  | $ | 4,255.2 |  |  | $ | 5,929.1 |  |  | $ | 8,496.1 |
Net revenue from royalties |  | Associates |  | $ | 489.4 |  |  | $ | 516.7 |  |  | $ | 482.5 |
| c. | Purchases
|  |  |  | Years Ended December 31 |
|  |  |  | 2015 |  |  | 2016 |  |  | 2017 |
|  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Related Party Categories |  |  |  |  |  |  |  |  |  |  |  |  |  |
Associates |  |  |  | $ | 11,126.4 |  |  | $ | 10,108.2 |  |  | $ | 9,904.6 |
| d. | Receivables from related parties
|  |  |  | December 31, 2016 |  |  | December 31, 2017 |
|  |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |
Item |  | Related Party Name/Categories |  |  |  |  |  |  |  |
Receivables from related parties |  | GUC |  | $ | 969.1 |  |  | $ | 1,022.9 |
|  | Xintec |  |  | 0.4 |  |  |  | 161.2 |
|  |  |  | $ | 969.5 |  |  | $ | 1,184.1 |
Other receivables from related parties |  | SSMC |  | $ | 60.7 |  |  | $ | 83.1 |
|  | VIS |  |  | 86.0 |  |  |  | 78.2 |
|  | Other Associates |  |  | 0.1 |  |  |  | 9.8 |
|  |  |  | $ | 146.8 |  |  | $ | 171.1 |
| e. | Payables to related parties
|  |  |  | December 31, 2016 |  |  | December 31, 2017 |
|  |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |
Item |  | Related Party Name/Categories |  |  |  |  |  |  |  |
Payables to related parties |  | Xintec |  | $ | 124.6 |  |  | $ | 817.9 |
|  | VIS |  |  | 587.4 |  |  |  | 410.0 |
|  | SSMC |  |  | 506.1 |  |  |  | 407.0 |
|  | Other Associates |  |  | 44.1 |  |  |  | 21.5 |
|  |  |  | $ | 1,262.2 |  |  | $ | 1,656.4 |
| f. | Acquisition of property, plant and equipment
|  |  |  | Acquisition Price |
|  |  |  | Years Ended December 31 |
|  |  |  | 2015 |  |  | 2016 |  |  | 2017 |
|  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Related Party Categories |  |  |  |  |  |  |  |  |  |  |  |  |  |
Associates |  |  |  | $ | 26.2 |  |  | $ | — |  |  | $ | — |
| g. | Others
|  |  |  | Years Ended December 31 |
|  |  |  | 2015 |  |  | 2016 |  |  | 2017 |
|  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Item |  | Related Party Categories |  |  |  |  |  |  |  |  |  |  |  |
Manufacturing expenses |  | Associates |  | $ | 2,321.9 |  |  | $ | 1,389.2 |  |  | $ | 2,196.1 |
|  | Joint venture |  |  | 12.8 |  |  |  | — |  |  |  | — |
|  |  |  | $ | 2,334.7 |  |  | $ | 1,389.2 |  |  | $ | 2,196.1 |
Research and development expenses |  | Associates |  | $ | 142.8 |  |  | $ | 161.7 |  |  | $ | 69.8 |
|  | Joint venture |  |  | 1.4 |  |  |  | — |  |  |  | — |
|  |  |  | $ | 144.2 |  |  | $ | 161.7 |  |  | $ | 69.8 |
General and administrative expenses |  | Other related parties |  | $ | 60.0 |  |  | $ | 60.0 |  |  | $ | 101.5 |
Compensation to Directors and Other Key Management Personnel | The compensation to directors and other key management personnel for the years ended December 31, 2015, 2016 and 2017 were as follows:
|  |  |  | Years Ended December 31 |
|  |  |  | 2015 |  |  | 2016 |  |  | 2017 |
|  |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Short-term employee benefits |  |  |  | $ | 1,883.0 |  |  | $ | 2,024.0 |  |  | $ | 2,170.3 |
Post-employment benefits |  |  |  |  | 10.9 |  |  |  | 4.0 |  |  |  | 3.7 |
|  |  |  | $ | 1,893.9 |  |  | $ | 2,028.0 |  |  | $ | 2,174.0 |

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