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Intangible Assets and Goodwill - Goodwill by Reporting Segment (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) reporting_unit | Mar. 31, 2022 USD ($) unit | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($)
Goodwill By Reporting Segment [Line Items] |  |  |  |  |
Goodwill | $ 6,673.6 | $ 6,673.6 | $ 6,673.6 | $ 6,670.6 |
Number of reporting units |  | 2 | 2 |  |
Semiconductor Products Reporting Unit |  |  |  |  |
Goodwill By Reporting Segment [Line Items] |  |  |  |  |
Goodwill | 6,654.4 | $ 6,654.4 | $ 6,654.4 | 6,651.4 | $ 6,645.6
Additions | 3.0 |  |  | 5.8 |
Technology Licensing Reporting Unit |  |  |  |  |
Goodwill By Reporting Segment [Line Items] |  |  |  |  |
Goodwill | 19.2 | $ 19.2 | $ 19.2 | 19.2 | $ 19.2
Additions | $ 0.0 |  |  | $ 0.0 |

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