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Goodwill and Intangible Assets (Tables)
 12 Months Ended
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, 2020198.6 220.6 8.8 428.0 
Additions
— — 5.0 5.0 
Acquisitions through business combination 3126.0 173.4 — 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:
AssumptionCapital Equipment CGUA&D CGUAtrenne CGUPCI 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%.