Intangible Assets and Goodwill (Tables)

9 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

Intangible assets consist of the following (in millions):

	December 31, 2019
	Gross Amount		Accumulated Amortization			Net Amount
Core and developed technology	$	7,345.0	$	(1,733.8	)	$	5,611.2
Customer-related	916.7		(651.7		)	265.0
In-process research and development	8.8		—			8.8
Distribution rights and other	90.6		(36.1		)	54.5
Total	$	8,361.1	$	(2,421.6	)	$	5,939.5

	March 31, 2019
	Gross Amount		Accumulated Amortization			Net Amount
Core and developed technology	$	7,339.2	$	(1,102.2	)	$	6,237.0
Customer-related	917.1		(544.0		)	373.1
In-process research and development	7.7		—			7.7
Distribution rights and other	81.4		(13.6		)	67.8
Total	$	8,345.4	$	(1,659.8	)	$	6,685.6

Schedule of Intangible Assets

Intangible assets consist of the following (in millions):

	December 31, 2019
	Gross Amount		Accumulated Amortization			Net Amount
Core and developed technology	$	7,345.0	$	(1,733.8	)	$	5,611.2
Customer-related	916.7		(651.7		)	265.0
In-process research and development	8.8		—			8.8
Distribution rights and other	90.6		(36.1		)	54.5
Total	$	8,361.1	$	(2,421.6	)	$	5,939.5

	March 31, 2019
	Gross Amount		Accumulated Amortization			Net Amount
Core and developed technology	$	7,339.2	$	(1,102.2	)	$	6,237.0
Customer-related	917.1		(544.0		)	373.1
In-process research and development	7.7		—			7.7
Distribution rights and other	81.4		(13.6		)	67.8
Total	$	8,345.4	$	(1,659.8	)	$	6,685.6

Schedule of Projected Amortization Expense

The following is an expected amortization schedule for the intangible assets for remainder of fiscal 2020 through fiscal 2024, absent any future acquisitions or impairment charges (in millions):

Fiscal Year Ending March 31,	Projected Amortization Expense
2020	$	259.0
2021	$	972.9
2022	$	902.2
2023	$	708.4
2024	$	616.3

Schedule of Amortization Expense by Intangible Asset Class

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,
	2019		2018		2019		2018
Amortization expense charged to cost of sales	$	2.5	$	1.8	$	7.1	$	4.9
Amortization expense charged to operating expense	256.1		195.1		770.5		500.6
Total amortization expense	$	258.6	$	196.9	$	777.6	$	505.5

Schedule of Goodwill Activity

Goodwill activity for the nine months ended December 31, 2019 was as follows (amounts in millions):

	Semiconductor Products Reporting Unit		Technology Licensing Reporting Unit
Balance at March 31, 2019	$	6,644.7	$	19.2
Additions	0.9		—
Balance at December 31, 2019	$	6,645.6	$	19.2