Intangible Assets and Goodwill (Tables)

6 Months Ended

Jun. 30, 2020

Intangible assets, net of accumulated amortization, impairment charges and adjustments, are summarized as follows:



		As of June 30, 2020							As of December 31, 2019
(In millions)	Estimated Life	Cost		Accumulated Amortization			Net		Cost		Accumulated Amortization			Net
Completed technology	4-28 years	$	7,379.3	$	(5,014.4	)	$	2,364.9	$	7,379.3	$	(4,881.4	)	$	2,497.9
In-process research and development	Indefinite until commercialization	954.9		—			954.9		965.5		—			965.5
Trademarks and trade names	Indefinite	64.0		—			64.0		64.0		—			64.0
Total intangible assets		$	8,398.2	$	(5,014.4	)	$	3,383.8	$	8,408.8	$	(4,881.4	)	$	3,527.4

he estimated future amortization of acquired intangible assets for the next five years is expected to be as follows:

The following table provides a roll forward of the changes in our goodwill balance:



(In millions)	As of June 30, 2020
Goodwill, beginning of period	$	5,757.8
Other	(6.8		)
Goodwill, end of period	$	5,751.0