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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 8,361.1 | $ 8,345.4
Accumulated Amortization | (2,421.6) | (1,659.8)
Net Amount | 5,939.5 | 6,685.6
Projected Amortization Expense |  |
2020 | 259.0 |
2021 | 972.9 |
2022 | 902.2 |
2023 | 708.4 |
2024 | $ 616.3 |
Minimum |  |
Projected Amortization Expense |  |
Useful life (in years) | 1 year |
Maximum |  |
Projected Amortization Expense |  |
Useful life (in years) | 15 years |
Core and developed technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | $ 7,345.0 | 7,339.2
Accumulated Amortization | (1,733.8) | (1,102.2)
Net Amount | 5,611.2 | 6,237.0
Customer-related |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 916.7 | 917.1
Accumulated Amortization | (651.7) | (544.0)
Net Amount | 265.0 | 373.1
In-process research and development |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 8.8 | 7.7
Accumulated Amortization | 0.0 | 0.0
Net Amount | 8.8 | 7.7
Distribution rights and other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Amount | 90.6 | 81.4
Accumulated Amortization | (36.1) | (13.6)
Net Amount | $ 54.5 | $ 67.8

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