4. Intangible Assets, Goodwill and Other

6 Months Ended

Jun. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets Disclosure

GOODWILL 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, 2019:
Goodwill	$	250.1	$	349.2	$	599.3
Accumulated impairment losses	(41.8)		(293.4)		(335.2)
Goodwill, net	208.3		55.8		264.1
Acquisitions (*)	29.4		—		29.4
Other adjustments (**)	(2.0)		—		(2.0)
Balances as of June 30, 2020:
Goodwill	277.5		349.2		626.7
Accumulated impairment losses	(41.8)		(293.4)		(335.2)
Goodwill, net	$	235.7	$	55.8	$	291.5

* Acquisitions consist of $29.4 million recorded for Celsee, Inc. (see Note 2, "Acquisitions and Divestitures").

** Goodwill decreased by $2.0 million due to the release from an escrow account setup during our acquisition of a small U.S. private company, which should have been classified as a prepaid asset in its opening balance sheet as of our March 2, 2019 acquisition date.

Information regarding our identifiable purchased intangible assets with definite and indefinite lives is as follows (in millions):

	June 30, 2020
	Weighted-Average Remaining Amortization Period (years)	Purchase Price		Accumulated Amortization		Net Carrying Amount
Customer relationships/lists	5.85	$	109.9	$	(77.4)	$	32.5
Know how	5.25	188.7		(165.3)		23.4
Developed product technology	14.40	213.0		(97.6)		115.4
Licenses	8.25	66.0		(36.2)		29.8
Tradenames	8.17	6.4		(3.8)		2.6
Covenants not to compete	4.30	4.5		(1.6)		2.9
Other	—	0.1		(0.1)		—
Total definite-lived intangible assets		588.6		(382.0)		206.6
In-process research and development		4.8		—		4.8
Total purchased intangible assets		$	593.4	$	(382.0)	$	211.4

	December 31, 2019
	Weighted-Average Remaining Amortization Period (years)	Purchase Price		Accumulated Amortization		Net Carrying Amount
Customer relationships/lists	6.36	$	107.2	$	(74.3)	$	32.9
Know how	5.71	188.5		(162.6)		25.9
Developed product technology	8.31	144.2		(93.9)		50.3
Licenses	8.74	76.0		(44.4)		31.6
Tradenames	8.50	6.4		(3.6)		2.8
Covenants not to compete	6.01	3.2		(1.4)		1.8
Other	—	0.1		(0.1)		—
Total definite-lived intangible assets		525.6		(380.3)		145.3
In-process research and development		0.2		—		0.2
Total purchased intangible assets		$	525.8	$	(380.3)	$	145.5

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

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2020		2019		2020		2019
Amortization expense	$	7.2	$	5.6	$	13.1	$	11.1