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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Intangible Assets [Abstract] |
Disclosure of Changes in Goodwill and Intangible Assets | Goodwill and intangible assets are comprised of the following:
| 2019
| Cost |  | Accumulated Amortization and Impairment |  | Net Book Value
Goodwill | $ | 253.7 |  |  | $ | 55.4 |  |  | $ | 198.3 |
Intellectual property | $ | 111.3 |  |  | $ | 111.3 |  |  | $ | — |
Other intangible assets | 503.2 |  |  | 260.9 |  |  | 242.3 |
Computer software assets | 291.1 |  |  | 282.1 |  |  | 9.0 |
| $ | 905.6 |  |  | $ | 654.3 |  |  | $ | 251.3 |
| 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 |
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, 2019 |  | $ | 198.4 |  |  | $ | 269.8 |  |  | $ | 13.8 |  |  | $ | 482.0 |
Additions |  | — |  |  | — |  |  | 1.8 |  |  | 1.8 |
Adjustment through business combinations(i) | 3 | — |  |  | (3.0) |  |  | (0.7) |  |  | (3.7) |
Amortization |  | — |  |  | (24.6) |  |  | (5.0) |  |  | (29.6) |
Write-down of assets |  | — |  |  | — |  |  | (0.8) |  |  | (0.8) |
Foreign exchange and other |  | (0.1) |  |  | 0.1 |  |  | (0.1) |  |  | (0.1) |
Balance — December 31, 2019 |  | 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 |
(i) Adjustments were made in 2019 to reflect the fair value of assets acquired in connection with our Impakt acquisition. We
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
Annual revenue growth rate(1) |  | 2020 — 13% over 5 year period; 2019 — 13% over 5 year period; 2018 — 4% over 5 year period |  | 2020 — 8% growth over 5 year period; 2019 — modest growth over 5 year period; 2018 — modest growth over 5 year period |  | 2020 — 9% over 5 year period; 2019 — 4% over 5 year period; 2018 — 12% over 4 year period
Average annual margins |  | 2020 — above company margins; 2019 — above company margins; 2018 — above company margins |  | 2020 — slightly above company margins; 2019 — slightly above company margins; 2018 — slightly above company margins |  | 2020 — above company margins; 2019 — above company margins; 2018 — above company margins
Discount rate |  | 2020 — 12%; 2019 — 13%; 2018 — 13% |  | 2020 — 11%; 2019 — 10%; 2018 — 11% |  | 2020 — 10%; 2019 — 10%; (2) 2018 — 13%
(1) Supported by recent business awards, the expectation of future new business awards, and growth due to our acquisitions. (2) The decrease in the discount rate from 2018 to 2019 used for our Atrenne CGU was supported by the then-overall decrease in our weighted average cost of capital, as well as the CGU's strong performance.

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