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Intangible Assets and Goodwill (Tables) | 12 Months Ended
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Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets, Indefinite-Lived | Intangible assets consist of the following (in millions):
| 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 |
| 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, Finite-Lived | Intangible assets consist of the following (in millions):
| 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 |
| 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 fiscal 2021 through fiscal 2025, absent any future acquisitions or impairment charges (in millions):
Fiscal Year Ending March 31, |  | Projected Amortization Expense
2021 |  | $ | 985.8 |
2022 |  | $ | 903.3 |
2023 |  | $ | 693.1 |
2024 |  | $ | 617.6 |
2025 |  | $ | 501.4 |
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):
| Year Ended March 31,
| 2020 |  | 2019 |  | 2018
Amortization expense charged to cost of sales | $ | 8.9 |  |  | $ | 9.6 |  |  | $ | 6.1 |
Amortization expense charged to operating expense | 1,037.8 |  |  | 686.2 |  |  | 486.1 |
Total amortization expense | $ | 1,046.7 |  |  | $ | 695.8 |  |  | $ | 492.2 |
Schedule of Goodwill Activity | Goodwill activity for fiscal 2020 and fiscal 2019 was as follows (amounts in millions):
| Semiconductor Products Reporting Unit |  | Technology Licensing Reporting Unit
Balance at March 31, 2018 | $ | 2,279.8 |  |  | $ | 19.2 |
Additions due to the acquisition of Microsemi | 4,364.9 |  |  | — |
Balance at March 31, 2019 | $ | 6,644.7 |  |  | $ | 19.2 |
Additions | 0.9 |  |  | — |
Balance at March 31, 2020 | $ | 6,645.6 |  |  | $ | 19.2 |

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