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Intangible Assets and Goodwill - Intangible Assets, by Major Class (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross amount | $ 8,343.8 |  | $ 8,345.4
Accumulated amortization | (1,915.1) |  | (1,659.8)
Net amount | 6,428.7 |  | 6,685.6
Projected Amortization Expense |  |  |
2020 | 754.5 |  |
2021 | 946.1 |  |
2022 | 875.0 |  |
2023 | 681.1 |  |
2024 | 614.3 |  |
Impairment of intangible assets | $ 0.5 | $ 2.0 |
Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life (in years) | 1 year |  |
Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life (in years) | 15 years |  |
Core and developed technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross amount | $ 7,411.9 |  | 7,413.0
Accumulated amortization | (1,331.7) |  | (1,112.9)
Net amount | 6,080.2 |  | 6,300.1
Customer-related |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross amount | 917.1 |  | 917.1
Accumulated amortization | (580.0) |  | (544.0)
Net amount | 337.1 |  | 373.1
In-process research and development |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross amount | 7.7 |  | 7.7
Accumulated amortization | 0.0 |  | 0.0
Net amount | 7.7 |  | 7.7
Distribution rights and other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross amount | 7.1 |  | 7.6
Accumulated amortization | (3.4) |  | (2.9)
Net amount | $ 3.7 |  | $ 4.7

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