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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Mar. 31, 2024
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (5,213.1) | $ (4,866.9)
Gross Amount | 7,731.3 | 7,648.7
Net Amount | 2,518.2 | 2,781.8
Amortization Expense |  |
2025 | 145.8 |
2026 | 519.0 |
2027 | 423.7 |
2028 | 314.3 |
2029 | 240.6 |
In-process research and development |  |
Finite-Lived Intangible Assets [Line Items] |  |
Purchased intangible assets, indefinite-lived | 50.8 |
Amortization Expense |  |
In-process research and development | $ 50.8 |
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 | $ 7,227.0 | 7,221.3
Accumulated Amortization | (4,941.0) | (4,590.9)
Net Amount | 2,286.0 | 2,630.4
Customer-related |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 199.5 | 196.7
Accumulated Amortization | (149.8) | (140.8)
Net Amount | 49.7 | 55.9
Purchased intangible assets, finite-lived | 2.8 |
Software licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 254.0 | 230.7
Accumulated Amortization | (122.3) | (135.2)
Net Amount | 131.7 | $ 95.5
Purchased intangible assets, finite-lived | $ 1.1 |

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