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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2022
Intangible assets and goodwill [abstract]  
Disclosure of Changes in Goodwill and Intangible Assets
Goodwill and intangible assets are comprised of the following:
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 
2022
Cost
Accumulated
Amortization
and Impairment
Net Book
Value
Goodwill
$377.2 $55.4 $321.8 
Intellectual property
$111.3 $111.3 $— 
Other intangible assets
679.3 342.1 337.2 
Computer software assets
300.7 291.4 9.3 
$1,091.3 $744.8 $346.5 
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, 2021$198.6 $220.6 $8.8 $428.0 
Additions
— — 5.0 5.0 
Acquisitions through business combinations3126.0 173.4 — 299.4 
Amortization
— (22.5)(3.0)(25.5)
Foreign exchange and other
(0.4)— (0.3)(0.7)
Balance — December 31, 2021324.2 371.5 10.5 706.2 
Additions
— — 1.9 1.9 
Adjustment to acquisitions through business combination (i)
3(2.2)2.7 — 0.5 
Amortization
— (37.0)(3.1)(40.1)
Foreign exchange and other
(0.2)— — (0.2)
Balance — December 31, 2022$321.8 $337.2 $9.3 $668.3 
(i)    In Q1 2022, we finalized the PCI purchase price allocation. In connection therewith, we adjusted our preliminary purchase price allocation by, among other things, increasing the carrying value of customer intangible assets by $2.7, and decreasing goodwill by $2.2. See note 3.
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 CGU
A&D CGU(iii)
Atrenne CGU(iii)
PCI CGU
Annual revenue growth rate
2022 — 9% over 5 year period;
2021 — 10% over 5 year period;
2020 — 13% over 5 year period		2022 — 12% over 5 year period; 2021 — 11% over 5 year period; 2020 — 8% over 5 year period
2022 — N/A(iii);
2021 — 19% over 5 year period;
2020 — 9% over 5 year period
2022 — 11% over 5 year period;
2021 — 9% over 5 year period;
2020 — N/A
Average annual CGU margins over the 5-year period
2022 — above total company margin(i);
2021 — above total company margin(i);
2020 — above total company margin(i)
2022 — slightly above total company margin(i);
2021 — slightly above total company margin(i);
2020 — slightly above total company margin(i)
2022 — N/A (iii);
2021 — above total company margin(i);
2020 — above total company margin(i)

2022 — above total company margin(i);
2021 — above total company margin(i);
2020 — N/A
Discount rate (ii)
2022 — 14%;
2021 — 11%;
2020 — 12%		2022 — 12%;
2021 — 11%; 2020 — 11%
2022 — N/A (iii);
2021 — 10%; 2020 — 10%
2022 — 15%;
2021 — 15%;
2020 — N/A
(i) Total company margin is defined as total segment income as a percentage of total revenue. See note 25.
(ii) For 2022, the pre-tax discount rate by CGU is as follows: Capital Equipment CGU 18%; A&D CGU 15%; and PCI CGU 18%.
(iii)    Commencing in 2022, our Atrenne CGU merged into our A&D CGU, and is no longer a separate CGU. As a result, our 2022 Annual Impairment Assessment for our A&D CGU includes our Atrenne business.