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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Intangible Assets [Abstract] |
Disclosure of Changes in Goodwill and Intangible Assets | Goodwill and intangible assets are comprised of the following:
| 2017
| Cost |  | Accumulated Amortization and Impairment |  | Net Book Value
Goodwill | $ | 78.6 |  |  | $ | 55.4 |  |  | $ | 23.2 |
Intellectual property | $ | 111.3 |  |  | $ | 111.3 |  |  | $ | — |
Other intangible assets | 237.0 |  |  | 226.6 |  |  | 10.4 |
Computer software assets | 285.3 |  |  | 274.1 |  |  | 11.2 |
| $ | 633.6 |  |  | $ | 612.0 |  |  | $ | 21.6 |
| 2018
| Cost |  | Accumulated Amortization and Impairment |  | Net Book Value
Goodwill | $ | 253.8 |  |  | $ | 55.4 |  |  | $ | 198.4 |
Intellectual property | $ | 111.3 |  |  | $ | 111.3 |  |  | $ | — |
Other intangible assets | 508.0 |  |  | 238.2 |  |  | 269.8 |
Computer software assets | 290.1 |  |  | 276.3 |  |  | 13.8 |
| $ | 909.4 |  |  | $ | 625.8 |  |  | $ | 283.6 |
The following table details the changes to the net book value of goodwill and intangible assets for the years indicated:
| Goodwill |  | Other Intangible Assets |  | Computer Software Assets |  | Total
Balance — January 1, 2017 | $ | 23.2 |  |  | $ | 15.9 |  |  | $ | 9.6 |  |  | $ | 48.7 |
Additions | — |  |  | — |  |  | 4.9 |  |  | 4.9 |
Amortization | — |  |  | (5.5 | ) |  | (3.4 | ) |  | (8.9 | )
Foreign exchange and other | — |  |  | — |  |  | 0.1 |  |  | 0.1 |
Balance — December 31, 2017 | 23.2 |  |  | 10.4 |  |  | 11.2 |  |  | 44.8 |
Additions | — |  |  | — |  |  | 3.3 |  |  | 3.3 |
Acquisitions through business combinations (note 3) | 175.2 |  |  | 271.0 |  |  | 3.0 |  |  | 449.2 |
Amortization | — |  |  | (11.6 | ) |  | (3.8 | ) |  | (15.4 | )
Foreign exchange and other | — |  |  | — |  |  | 0.1 |  |  | 0.1 |
Balance — December 31, 2018 | $ | 198.4 |  |  | $ | 269.8 |  |  | $ | 13.8 |  |  | $ | 482.0 |
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) |  | 2018 — 4% over 5 year period; 2017 — 9% over 6 year period; 2016 — 7% over 7 year period |  | 2018 — modest growth over 5 year period; 2017 — modest growth over 4 year period; 2016 — N/A |  | 2018 — 12% over 4 year period; 2017 and 2016 — N/A
Average annual margins |  | 2018 — above company margins; 2017 and 2016 — slightly above company margins |  | 2018 — slightly above company margins; 2017 — used company margins; 2016 — N/A |  | 2018 — above company margins; 2017 and 2016 — N/A
Discount rate |  | 2018 —13%; 2017 and 2016 —17% |  | 2018 — 11%; 2017 — 9%; 2016 — N/A |  | 2018 — 13%; 2017 and 2016 — N/A
(1) Supported by new business awarded in recent years, and the expectation of future new business awards.

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- Definition The disclosure of information for cash-generating units. [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The disclosure of the reconciliation of changes in intangible assets and goodwill. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118&doctype=Standard -URIDate 2017-03-09 + Details
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