Intangible Assets and Goodwill (Tables)

3 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

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



		As of March 31, 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	$	(4,952.9	)	$	2,426.4	$	7,379.3	$	(4,881.4	)	$	2,497.9
In-process research and development	Indefinite until commercialization	956.5		—			956.5		965.5		—			965.5
Trademarks and trade names	Indefinite	64.0		—			64.0		64.0		—			64.0
Total intangible assets		$	8,399.8	$	(4,952.9	)	$	3,446.9	$	8,408.8	$	(4,881.4	)	$	3,527.4

Estimated future amortization for acquired intangible assets

Based upon this most recent analysis, the estimated future amortization of acquired intangible assets for the next five years is expected to be as follows:



(In millions)	As of March 31, 2020
2020 (remaining nine months)	$	193.0
2021	220.0
2022	220.0
2023	230.0
2024	230.0
2025	220.0

Summary of roll forward of the changes in goodwill

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



(In millions)	As of March 31, 2020
Goodwill, beginning of period	$	5,757.8
Other	(5.8		)
Goodwill, end of period	$	5,752.0