Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2017

GOODWILL AND INTANGIBLE ASSETS:

Goodwill and intangible assets are comprised of the following:



	2016
	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		221.1		15.9
Computer software assets	284.1		274.5		9.6
	$	632.4	$	606.9	$	25.5



	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

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, 2016	$	19.5	$	21.9		$	8.5		$	49.9
Additions	—		—			4.5			4.5
Acquisitions through business combinations (note 3)	3.7		—			0.1			3.8
Amortization	—		(6.0		)	(3.4		)	(9.4		)
Foreign exchange and other	—		—			(0.1		)	(0.1		)
Balance — December 31, 2016	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

In the fourth quarter of each year, we perform our Annual Impairment Assessment. We recorded no impairment charges against goodwill or intangible assets in 2017, 2016 or 2015.