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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Intangible Assets [Abstract] |
Disclosure of Changes in Goodwill and Intangible Assets | Goodwill and intangible assets are comprised of the following:
| 2020
| Cost |  | Accumulated Amortization and Impairment |  | Net Book Value
Goodwill | $ | 254.0 |  |  | $ | 55.4 |  |  | $ | 198.6 |
Intellectual property | $ | 111.3 |  |  | $ | 111.3 |  |  | $ | — |
Other intangible assets | 503.2 |  |  | 282.6 |  |  | 220.6 |
Computer software assets | 294.4 |  |  | 285.6 |  |  | 8.8 |
| $ | 908.9 |  |  | $ | 679.5 |  |  | $ | 229.4 |
| 2021
| Cost |  | Accumulated Amortization and Impairment |  | Net Book Value
Goodwill | $ | 379.6 |  |  | $ | 55.4 |  |  | $ | 324.2 |
Intellectual property | $ | 111.3 |  |  | $ | 111.3 |  |  | $ | — |
Other intangible assets | 676.6 |  |  | 305.1 |  |  | 371.5 |
Computer software assets | 298.8 |  |  | 288.3 |  |  | 10.5 |
| $ | 1,086.7 |  |  | $ | 704.7 |  |  | $ | 382.0 |
The following table details the changes to the net book value of goodwill and intangible assets for the years indicated:
| Note | Goodwill |  | Other Intangible Assets |  | Computer Software Assets |  | Total
Balance — January 1, 2020 |  | $ | 198.3 |  |  | $ | 242.3 |  |  | $ | 9.0 |  |  | $ | 449.6 |
Additions |  | — |  |  | — |  |  | 3.5 |  |  | 3.5 |
Amortization |  | — |  |  | (21.8) |  |  | (3.8) |  |  | (25.6) |
Foreign exchange and other |  | 0.3 |  |  | 0.1 |  |  | 0.1 |  |  | 0.5 |
Balance — December 31, 2020 |  | 198.6 |  |  | 220.6 |  |  | 8.8 |  |  | 428.0 |
Additions |  | — |  |  | — |  |  | 5.0 |  |  | 5.0 |
Acquisitions through business combination | 3 | 126.0 |  |  | 173.4 |  |  | — |  |  | 299.4 |
Amortization |  | — |  |  | (22.5) |  |  | (3.0) |  |  | (25.5) |
Foreign exchange and other |  | (0.4) |  |  | — |  |  | (0.3) |  |  | (0.7) |
Balance — December 31, 2021 |  | $ | 324.2 |  |  | $ | 371.5 |  |  | $ | 10.5 |  |  | $ | 706.2 |
Disclosure of Assumptions For Annual Impairment Assessments of Goodwill | We used the following assumptions for purposes of our Annual Impairment Assessments of goodwill for the periods shown:
Assumption | Capital Equipment CGU | A&D CGU | Atrenne CGU | PCI CGU |
Annual revenue growth rate | 2021 — 10% over 5 year period; 2020 — 13% over 5 year period; 2019 — 13% over 5 year period | 2021 — 11% over 5 year period; 2020 — 8% over 5 year period; 2019 — modest growth over 5 year period | 2021 — 19% over 5 year period; 2020 — 9% over 5 year period; 2019 — 4% over 5 year period | 2021 — 9% over 5 year period; 2020 — N/A; 2019 — N/A |
Average annual CGU margins over the 5-year period | 2021 — above total company margin(i); 2020 — above total company margin(i); 2019 — above total company margin(i) | 2021 — slightly above total company margin(i); 2020 — slightly above total company margin(i); 2019 — slightly above total company margin(i) | 2021 — above total company margin(i); 2020 — above total company margin(i); 2019 — above total company margin(i) | 2021 — above total company margin(i); 2020 — N/A; 2019 — N/A |
Discount rate (ii) | 2021 — 11%; 2020 — 12%; 2019 — 13% | 2021 — 11%; 2020 — 11%; 2019 — 10% | 2021 — 10%; 2020 — 10%; 2019 — 10% | 2021 — 15%; 2020 — N/A; 2019 — N/A |
(i) Total company margin is defined as total segment income as a percentage of total revenue. See note 25. (ii) For 2021, the pre-tax discount rate by CGU is as follows: Capital Equipment CGU — 14%; A&D CGU — 13%; Atrenne CGU — 13%; and PCI CGU — 18%.

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