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Income Taxes - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax holiday, aggregate dollar amount |  | $ 11.4 |  | $ 6.2 |
Income tax holiday expense, aggregate dollar amount |  |  | $ 0.1 |  |
Income tax holiday, benefits per share, basic (in dollars per share) |  | $ 0.05 | $ 0 | $ 0.03 |
Income tax holiday, benefits per share, diluted (in dollars per share) |  | $ 0.04 | $ 0 | $ 0.02 |
Tax benefit related to intra-group transfers of certain intellectual property rights | $ 334.8 | $ 334.8 | $ 90.6 | $ 0.0 |
Reduction in effective tax rate related to intra-group transfers of certain intellectual property rights |  | 222.90% |  |  |
Deferred tax asset representing the book and tax basis difference on transferred assets |  | $ 78.0 |  |  |
Deferred tax liability representing the book and tax basis difference on transferred assets |  | 259.9 |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Capital loss carryforward |  | 9.4 | 9.6 |  |
Refundable foreign tax credits |  | 4.1 |  |  |
Tax credits, research activity |  | 104.1 |  |  |
Tax credits, prior year |  | 9.2 |  |  |
Tax credits, foreign jurisdictions |  | 45.1 |  |  |
Unrecognized tax benefits, income tax penalties accrued |  | 74.6 | 88.1 |  |
Unrecognized tax benefits, income tax penalties and interest expense |  | 13.5 | 37.5 | 5.4 |
Unrecognized Tax Benefits |  | 757.3 | 763.4 | $ 436.0 | $ 398.5
Unrecognized tax benefits that would impact effective tax rate |  | 654.0 | $ 664.4 |  |
Unrecognized tax benefits, potential decrease |  | 10.0 |  |  |
Foreign Tax Authority and Federal and State Jurisdiction |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  | 74.8 |  |  |
State and Local Jurisdiction |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Tax credit carryforward, amount |  | 168.2 |  |  |
Foreign Tax Authority | Foreign Withholding Tax Credit |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Tax credit carryforward, amount |  | $ 20.4 |  |  |

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