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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Mar. 31, 2023
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Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (4,778.4) | $ (4,344.7)
Gross Amount | 7,714.9 | 7,713.7
Net Amount | 2,936.5 | 3,369.0
Amortization Expense |  |
2024 | 173.0 |
2025 | 557.3 |
2026 | 486.6 |
2027 | 385.7 |
2028 | $ 300.3 |
Minimum |  |
Amortization Expense |  |
Useful life | 1 year |
Maximum |  |
Amortization Expense |  |
Useful life | 15 years |
In-process research and development |  |
Indefinite-lived Intangible Assets [Line Items] |  |
In-process research and development |  | 5.7
Core and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 7,295.0 | 7,296.2
Accumulated Amortization | (4,517.8) | (4,103.4)
Net Amount | 2,777.2 | 3,192.8
Customer-related |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 196.7 | 199.8
Accumulated Amortization | (136.8) | (128.0)
Net Amount | 59.9 | 71.8
Software licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 223.2 | 211.7
Accumulated Amortization | (123.8) | (113.0)
Net Amount | $ 99.4 | 98.7
Distribution rights and other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount |  | 0.3
Accumulated Amortization |  | (0.3)
Net Amount |  | $ 0.0

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