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Intangible Assets and Goodwill (Tables) | 9 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets, Indefinite-Lived | 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 |
Schedule of Intangible Assets, Finite-Lived | 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 |
Schedule of Projected Amortization Expense | 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 |
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,
|  |  |  |  |  |  | 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 |
Schedule of Goodwill Activity | 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 |

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