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Intangible Assets and Goodwill (Tables) | 9 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of intangible assets | Intangible assets consist of the following (in millions):
|  | December 31, 2018
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Core and developed technology |  | $ | 7,064.4 |  |  | $ | (984.5 | ) |  | $ | 6,079.9 |
Customer-related |  | 1,043.8 |  |  | (512.3 | ) |  | 531.5 |
Backlog |  | 27.9 |  |  | (19.5 | ) |  | 8.4 |
In-process research and development |  | 7.7 |  |  | — |  |  | 7.7 |
Distribution rights |  | 0.3 |  |  | (0.2 | ) |  | 0.1 |
Other |  | 7.4 |  |  | (2.1 | ) |  | 5.3 |
Total |  | $ | 8,151.5 |  |  | $ | (1,518.6 | ) |  | $ | 6,632.9 |
|  | March 31, 2018
|  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Core and developed technology |  | $ | 1,952.3 |  |  | $ | (644.4 | ) |  | $ | 1,307.9 |
Customer-related |  | 716.9 |  |  | (375.9 | ) |  | 341.0 |
In-process research and development |  | 12.1 |  |  | — |  |  | 12.1 |
Distribution rights |  | 0.3 |  |  | (0.1 | ) |  | 0.2 |
Other |  | 1.5 |  |  | (0.7 | ) |  | 0.8 |
Total |  | $ | 2,683.1 |  |  | $ | (1,021.1 | ) |  | $ | 1,662.0 |
Schedule of projected amortization expense | The following is an expected amortization schedule for the intangible assets for the remainder of fiscal 2019 through fiscal 2023, absent any future acquisitions or impairment charges (in millions):
Fiscal Year Ending March 31, | Projected Amortization Expense
2019 | $196.8
2020 | $992.0
2021 | $926.7
2022 | $851.8
2023 | $660.5
Schedule of goodwill activity | Goodwill activity for the three and nine months ended December 31, 2018 was as follows (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 | 4,483.0 |  |  | — |
Balance at December 31, 2018 | $ | 6,762.8 |  |  | $ | 19.2 |

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