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Intangible Assets and Goodwill | 9 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets and Goodwill | Intangible Assets and Goodwill Intangible assets consist of the following (in millions):
|  | December 31, 2020
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Core and developed technology |  | $ | 7,362.4 |  |  | $ | (2,558.5) |  |  | $ | 4,803.9 |
Customer-related |  | 835.2 |  |  | (679.7) |  |  | 155.5 |
In-process research and development |  | 7.7 |  |  | — |  |  | 7.7 |
Distribution rights and other |  | 126.1 |  |  | (67.4) |  |  | 58.7 |
Total |  | $ | 8,331.4 |  |  | $ | (3,305.6) |  |  | $ | 5,025.8 |
|  | March 31, 2020
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Core and developed technology |  | $ | 7,331.9 |  |  | $ | (1,924.6) |  |  | $ | 5,407.3 |
Customer-related |  | 903.6 |  |  | (674.7) |  |  | 228.9 |
In-process research and development |  | 8.8 |  |  | — |  |  | 8.8 |
Distribution rights and other |  | 126.0 |  |  | (68.7) |  |  | 57.3 |
Total |  | $ | 8,370.3 |  |  | $ | (2,668.0) |  |  | $ | 5,702.3 |
The following is an expected amortization schedule for the intangible assets for the remainder of fiscal 2021 through fiscal 2025, absent any future acquisitions or impairment charges (in millions):
Fiscal Year Ending March 31, |  | Projected Amortization Expense
2021 |  | $ | 247.9 |
2022 |  | $ | 911.8 |
2023 |  | $ | 707.0 |
2024 |  | $ | 626.2 |
2025 |  | $ | 508.9 |
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,
|  |  |  |  |  |  | 2020 |  | 2019 |  | 2020 |  | 2019
Amortization expense charged to cost of sales |  |  |  |  |  |  | $ | 2.4 |  |  | $ | 2.5 |  |  | $ | 6.9 |  |  | $ | 7.1 |
Amortization expense charged to operating expense |  |  |  |  |  |  | 244.2 |  |  | 256.1 |  |  | 738.2 |  |  | 770.5 |
Total amortization expense |  |  |  |  |  |  | $ | 246.6 |  |  | $ | 258.6 |  |  | $ | 745.1 |  |  | $ | 777.6 |
There were no impairment charges in the three and nine months ended December 31, 2020 and in the three months ended December 31, 2019. The Company recognized impairment charges of $0.5 million in the nine months ended December 31, 2019. Goodwill activity for the nine months ended December 31, 2020 by segment was as follows (in millions):
| Semiconductor Products Reporting Unit |  | Technology Licensing Reporting Unit
Balance at March 31, 2020 | $ | 6,645.6 |  |  | $ | 19.2 |
Additions | 5.8 |  |  | — |
Balance at December 31, 2020 | $ | 6,651.4 |  |  | $ | 19.2 |
At March 31, 2020, 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, 2020, the Company has never recorded an impairment charge against its goodwill balance.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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