
	December 31, 2021
	Gross Amount		Accumulated Amortization		Net Amount
Core and developed technology	$	7,387.6	$	(3,374.4)	$	4,013.2
Customer-related	835.2		(736.2)		99.0


In-process research and development	6.4		—		6.4
Distribution rights and other	193.6		(55.9)		137.7
Total	$	8,422.8	$	(4,166.5)	$	4,256.3


	March 31, 2021
	Gross Amount		Accumulated Amortization		Net Amount
Core and developed technology	$	7,371.3	$	(2,771.0)	$	4,600.3
Customer-related	835.2		(702.6)		132.6


In-process research and development	7.7		—		7.7
Distribution rights and other	130.2		(76.0)		54.2
Total	$	8,344.4	$	(3,549.6)	$	4,794.8

The following is an expected amortization schedule for the intangible assets for the remainder of fiscal 2022 through fiscal 2026, absent any future acquisitions or impairment charges (in millions):


Fiscal Year Ending March 31,	Projected Amortization Expense
2022	$	233.1
2023	$	743.2
2024	$	666.0
2025	$	531.0
2026	$	459.8

The Company amortizes intangible assets over their expected useful lives, which range between 1 and 15 years. Amortization expense attributed to intangible assets are assigned to cost of sales and operating expenses as follows (in millions):


	Three Months Ended December 31,	Nine Months Ended December 31,
		2021		2020		2021		2020
Amortization expense charged to cost of sales		$	3.2	$	2.4	$	9.1	$	6.9
Amortization expense charged to operating expense		232.5		244.2		691.4		738.2
Total amortization expense		$	235.7	$	246.6	$	700.5	$	745.1

There were no impairment charges in the three and nine months ended December 31, 2021 and December 31, 2020.

Goodwill activity for the nine months ended December 31, 2021 by segment was as follows (in millions):


	Semiconductor Products Reporting Unit		Technology Licensing Reporting Unit


Balance at March 31, 2021	$	6,651.4	$	19.2
Additions	3.0		—
Balance at December 31, 2021	$	6,654.4	$	19.2

At March 31, 2021, the Company applied a qualitative goodwill impairment test to its two reporting units, concluding it was not more likely than not that goodwill was impaired. Through December 31, 2021, the Company has never recorded an impairment charge.