Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets Disclosure [Text Block]

Goodwill and Other Intangible Assets

The changes in the carrying amounts of goodwill by segment were as follows:

(In thousands)	Domestic		International		Total
Balance at the end of 2019	$	819,735	$	63,423	$	883,158
Purchase price allocation adjustments for the AbleVets acquisition	744		—		744
Goodwill recorded in connection with 2020 business acquisitions	33,709		—		33,709
Goodwill reduction in connection with divestiture transactions	—		(7,692)		(7,692)
Foreign currency translation adjustment and other	—		4,601		4,601
Balance at the end of 2020	854,188		60,332		914,520
Goodwill recorded in connection with the Kantar Health acquisition	119,709		106,523		226,232
Foreign currency translation adjustment and other	—		(9,631)		(9,631)
Balance at the end of 2021	$	973,897	$	157,224	$	1,131,121

A summary of net intangible assets is as follows:

	2021				2020
(In thousands)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Customer lists	$	636,410	$	360,598	$	494,615	$	312,044
Purchased software	396,508		346,381		354,228		337,811
Internal use software	233,438		150,356		207,696		123,280
Trade names	52,883		33,719		42,951		28,961
Other	52,179		21,882		50,535		18,680
Total	$	1,371,418	$	912,936	$	1,150,025	$	820,776
Intangible assets, net			$	458,482			$	329,249

Amortization expense for 2021, 2020 and 2019 was $95 million, $85 million and $114 million, respectively.

Estimated aggregate amortization expense for each of the next five years is as follows:

(In thousands)
2022	$	96,281
2023	86,863
2024	79,985
2025	38,916
2026	20,769