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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (3,968.3) | $ (3,549.6)
Gross Amount | 8,448.1 | 8,344.4
Net Amount | 4,479.8 | 4,794.8
Projected Amortization Expense |  |
2022 | 468.2 |
2023 | 742.6 |
2024 | 663.7 |
2025 | 528.6 |
2026 | $ 458.1 |
Minimum |  |
Projected Amortization Expense |  |
Useful life | 1 year |
Maximum |  |
Projected Amortization Expense |  |
Useful life | 15 years |
In-process research and development |  |
Indefinite-lived Intangible Assets [Line Items] |  |
In-process research and development | $ 6.4 | 7.7
Core and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 7,386.2 | 7,371.3
Accumulated Amortization | (3,172.3) | (2,771.0)
Net Amount | 4,213.9 | 4,600.3
Customer-related |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 835.2 | 835.2
Accumulated Amortization | (725.0) | (702.6)
Net Amount | 110.2 | 132.6
Distribution rights and other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 220.3 | 130.2
Accumulated Amortization | (71.0) | (76.0)
Net Amount | $ 149.3 | $ 54.2

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