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Income Taxes - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax holiday, aggregate dollar amount | $ 22.5 | $ 11.1 |  |  |
Income tax holiday, benefits per share, basic (in dollars per share) | $ 0.04 | $ 0.04 |  |  |
Income tax holiday, benefits per share, diluted (in dollars per share) | $ 0.04 | $ 0.04 |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Capital loss carryforward | $ 9.8 | $ 6.3 |  |  |
Refundable foreign tax credits | 0.7 |  |  |  |
Tax credits, research activity | 79.5 |  |  |  |
Tax credits, prior year | 0.1 |  |  |  |
Tax credits, foreign jurisdictions | 42.0 |  |  |  |
TCJA expected transition tax on accumulated unrepatriated foreign earnings |  |  |  |  | $ 290.3
TCJA transition tax on accumulated unrepatriated foreign earnings payable | 197.4 |  |  |  |
TCJA transition tax on accumulated unrepatriated foreign earnings payable in next 12 months | 23.2 |  |  |  |
TCJA transition tax for accumulated foreign earnings, percentage of liability payable each year for fiscal 2019 through fiscal 2023 |  |  |  |  | 8.00%
TCJA transition tax for accumulated foreign earnings, percentage of liability payable in fiscal 2024 |  |  |  |  | 15.00%
TCJA transition tax for accumulated foreign earnings, percentage of liability payable in fiscal 2025 |  |  |  |  | 20.00%
TCJA transition tax for accumulated foreign earnings, percentage of liability payable in fiscal 2026 |  |  |  |  | 25.00%
Unrecognized tax benefits, income tax penalties accrued | 72.7 | 83.9 |  |  |
Unrecognized tax benefits, income tax penalties and interest expense | 11.2 | 9.3 | $ 13.5 |  |
Unrecognized Tax Benefits | 804.1 | 826.3 | $ 757.3 | $ 763.4 |
Unrecognized tax benefits that would impact effective tax rate | 692.3 | $ 720.5 |  |  |
Unrecognized tax benefits, potential decrease | 10.0 |  |  |  |
Cumulative income tax expense impact of Altera decision | 22.2 |  |  |  |
Foreign Tax Authority and Federal and State Jurisdiction |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards | 77.0 |  |  |  |
State and Local Jurisdiction |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Tax credit carryforward, amount | 164.4 |  |  |  |
Foreign Tax Authority | Foreign Withholding Tax Credit |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Tax credit carryforward, amount | $ 19.9 |  |  |  |

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