Goodwill and Intangible Assets (Tables)

12 Months Ended

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.