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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Mar. 31, 2024
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (5,071.3) | $ (4,866.9)
Gross Amount | 7,725.8 | 7,648.7
Net Amount | 2,654.5 | 2,781.8
Amortization Expense |  |
2025 | 290.1 |
2026 | 515.7 |
2027 | 420.5 |
2028 | 311.4 |
2029 | 238.6 |
In-process research and development |  |
Finite-Lived Intangible Assets [Line Items] |  |
Purchased intangible assets, indefinite-lived | 56.8 |
Amortization Expense |  |
In-process research and development | $ 56.8 |
Minimum |  |
Amortization Expense |  |
Useful life | 1 year |
Maximum |  |
Amortization Expense |  |
Useful life | 15 years |
Core and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 7,220.1 | 7,221.3
Accumulated Amortization | (4,819.0) | (4,590.9)
Net Amount | 2,401.1 | 2,630.4
Customer-related |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 196.7 | 196.7
Accumulated Amortization | (146.8) | (140.8)
Net Amount | 49.9 | 55.9
Software licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 252.2 | 230.7
Accumulated Amortization | (105.5) | (135.2)
Net Amount | 146.7 | $ 95.5
Purchased intangible assets, finite-lived | $ 1.1 |

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