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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Intangible Assets [Abstract]  
Disclosure of Changes in Goodwill and Intangible Assets
Goodwill and intangible assets are comprised of the following:
 
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

 
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

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, 2018
 
$
23.2

 
$
10.4

 
$
11.2

 
$
44.8

Additions
 
—

 
—

 
3.3

 
3.3

Acquisitions through business combinations
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

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


(i)    Adjustments were made in 2019 to reflect the fair value of assets acquired in connection with the Impakt acquisition.
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)

2019 — 13% over 5 year period;
2018 — 4% over 5 year period;
2017 — 9% over 6 year period

2019 — modest growth over 5 year period;
2018 — modest growth over 5 year period;
2017 — modest growth over 4 year period

2019 — 4% over 5 year period;
2018 — 12% over 4 year period;
2017 — N/A
Average annual margins

2019 — above company margins;
2018 — above company margins;
2017 — slightly above company margins

2019 — slightly above company margins;
2018 — slightly above company margins;
2017 — used company margins

2019 — above company margins;
2018 — above company margins;
2017 — N/A
Discount rate

2019 —13%;
2018 —13%;
2017 —17%

2019 — 10%;
2018 — 11%;
2017 — 9%

2019 — 10%; (2)
2018 — 13%;
2017 — N/A
(1)     Supported by new business awarded in recent years, the expectation of future new business awards, and growth due to our acquisitions.
(2)
The decrease in the discount rate used for our Atrenne CGU is supported by the overall decrease in our weighted average cost of capital, as well as the overall strong performance of this business since its acquisition.