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Segment and Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Operating Segments [Abstract] |
Revenues by Reportable Segment | Information regarding each reportable segment for the periods indicated is set forth below:
Revenue by segment: | Year ended December 31
| 2018 |  | 2019 |  | 2020
|  | % of total |  |  | % of total |  |  | % of total
ATS | $ | 2,209.7 |  | 33% |  | $ | 2,285.6 |  | 39% |  | $ | 2,086.3 |  | 36%
CCS | 4,423.5 |  | 67% |  | 3,602.7 |  | 61% |  | 3,661.8 |  | 64%
Communications revenue as a % of total revenue |  | 41 | % |  |  | 40 | % |  |  | 42 | %
Enterprise revenue as a % of total revenue |  | 26 | % |  |  | 21 | % |  |  | 22 | %
Total | $ | 6,633.2 |  |  |  | $ | 5,888.3 |  |  |  | $ | 5,748.1 |  |
Information by Reportable Segment |
Segment income, segment margin, and reconciliation of segment income to IFRS earnings before income taxes: | Year ended December 31
| 2018 |  | 2019 |  | 2020
|  | Segment Margin |  |  | Segment Margin |  |  | Segment Margin
ATS segment income and margin | $ | 102.5 |  | 4.6 | % |  | $ | 64.2 |  | 2.8 | % |  | $ | 69.7 |  | 3.3 | %
CCS segment income and margin | 111.4 |  | 2.5 | % |  | 93.9 |  | 2.6 | % |  | 129.3 |  | 3.5 | %
Total segment income | 213.9 |  |  |  | 158.1 |  |  |  | 199.0 |  |
Reconciling items: |  |  |  |  |  |  |  |
Finance costs | 24.4 |  |  |  | 49.5 |  |  |  | 37.7 |  |
Employee SBC expense | 33.4 |  |  |  | 34.1 |  |  |  | 25.8 |  |
Amortization of intangible assets (excluding computer software) | 11.6 |  |  |  | 24.6 |  |  |  | 21.8 |  |
Other Charges (Recoveries) (note 16) | 61.0 |  |  |  | (49.9) |  |  |  | 23.5 |  |
Inventory fair value adjustment (note 3) | 1.6 |  |  |  | — |  |  |  | — |  |
IFRS earnings before income taxes | $ | 81.9 |  |  |  | $ | 99.8 |  |  |  | $ | 90.2 |  |
Disclosure of Geographical Areas | The following table details our external revenue allocated by manufacturing location among countries that generated 10% or more of total revenue for the years indicated:
| Year ended December 31
| 2018 |  | 2019 |  | 2020
Thailand | 32 | % |  | 34 | % |  | 35 | %
China | 20 | % |  | 18 | % |  | 20 | %
Malaysia | 12 | % |  | 12 | % |  | *
* Less than 10%. The following table details our allocation of property, plant and equipment and ROU assets among countries that represented 10% or more of total property, plant and equipment and ROU assets for the years indicated:
| December 31
| 2019 |  | 2020
China | 14 | % |  | 14 | %
Thailand | 16 | % |  | 17 | %
Romania | 11 | % |  | *
United States | 16 | % |  | 18 | %
Canada | * |  | *
* Less than 10%. The following table details our allocation of intangible assets and goodwill among countries that represented 10% or more of total intangible assets and goodwill for the years indicated:
| December 31
| 2019 |  | 2020
United States | 86 | % |  | 85 | %
South Korea | 10 | % |  | 11 | %
Disclosure of major customers | The following table sets forth the customers that individually represented 10% or more of total revenue for the years indicated, and their segments. No customer individually represented 10% or more of total revenue in 2020:
| Segment | Year ended December 31
|  | 2018 |  | 2019 |  |
Cisco Systems, Inc. | CCS | 14 | % |  | 12 | % |  |
Dell Technologies | CCS | 10 | % |  | * |  |
Total |  | 24 | % |  | 12 | % |  |
* Less than 10%.

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