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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (4,166.5) | $ (3,549.6)
Gross Amount | 8,422.8 | 8,344.4
Net Amount | 4,256.3 | 4,794.8
Projected Amortization Expense |  |
2022 | 233.1 |
2023 | 743.2 |
2024 | 666.0 |
2025 | 531.0 |
2026 | $ 459.8 |
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 | 7,387.6 | 7,371.3
Accumulated Amortization | (3,374.4) | (2,771.0)
Net Amount | 4,013.2 | 4,600.3
Customer-related |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 835.2 | 835.2
Accumulated Amortization | (736.2) | (702.6)
Net Amount | 99.0 | 132.6
Distribution rights and other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 193.6 | 130.2
Accumulated Amortization | (55.9) | (76.0)
Net Amount | $ 137.7 | $ 54.2

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