4. Intangible Assets, Goodwill and Other

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets Disclosure

ODWILL AND OTHER PURCHASED INTANGIBLE ASSETS

Changes to goodwill by segment were as follows (in millions):



	Life Science			Clinical Diagnostics			Total
Balances as of December 31, 2018:
Goodwill	$	234.5		$	320.5		$	555.0
Accumulated impairment losses	(41.8		)	(293.4		)	(335.2		)
Goodwill, net	192.7			27.1			219.8

Acquisitions	10.7			—			10.7

Balances as of March 31, 2019:
Goodwill	245.2			320.5			565.7
Accumulated impairment losses	(41.8		)	(293.4		)	(335.2		)
Goodwill, net	$	203.4		$	27.1		$	230.5

In conjunction with the purchase of all the issued and outstanding stock of a small private company in March 2019 (see Note 2, "Acquisitions"), we recorded $10.7 million of goodwill and $12.0 million of definite-lived intangible assets: $10.7 million of Know how and $1.3 million of Covenants not to compete.

Other than goodwill, we have no intangible assets with indefinite lives. Information regarding our identifiable purchased intangible assets with definite lives is as follows (in millions):



	March 31, 2019
	Average Remaining Life (years)	Purchase Price		Accumulated Amortization			Net Carrying Amount
Customer relationships/lists	1-6	$	87.2	$	(68.6	)	$	18.6
Know how	1-10	199.2		(159.1		)	40.1
Developed product technology	1-10	130.2		(87.8		)	42.4
Licenses	6-10	76.0		(41.6		)	34.4
Tradenames	2-6	3.9		(3.3		)	0.6
Covenants not to compete	3-7	4.5		(1.2		)	3.3
Total definite-lived intangible assets		$	501.0	$	(361.6	)	$	139.4



	December 31, 2018
	Average Remaining Life (years)	Purchase Price		Accumulated Amortization			Net Carrying Amount
Customer relationships/lists	1-6	$	88.7	$	(68.3	)	$	20.4
Know how	1-7	190.6		(159.8		)	30.8
Developed product technology	1-10	130.4		(86.6		)	43.8
Licenses	7-11	76.3		(40.9		)	35.4
Tradenames	2-6	3.9		(3.3		)	0.6
Covenants not to compete	7	3.2		(1.1		)	2.1
Total definite-lived intangible assets		$	493.1	$	(360.0	)	$	133.1

Amortization expense related to purchased intangible assets is as follows (in millions):



	Three Months Ended
	March 31,
	2019		2018

Amortization expense	$	5.5	$	7.4