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Income Taxes - Income Tax (Benefit) Provision from Continuing Operations (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
Pretax (loss) income: |  |  |  |
U.S. |  | $ (485.2) | $ (593.4) | $ (127.3)
Foreign |  | 635.6 | 797.9 | 864.6
Income before income taxes |  | 150.4 | 204.5 | 737.3
Current (benefit) expense: |  |  |  |
U.S. Federal |  | 21.1 | (98.0) | 369.4
State |  | 1.0 | (5.3) | 0.5
Foreign |  | 48.0 | 14.1 | 60.8
Total current (benefit) expense |  | 70.1 | (89.2) | 430.7
Deferred expense (benefit): |  |  |  |
U.S. Federal |  | (127.8) | 11.9 | 82.5
State |  | (13.2) | 0.6 | 0.1
Foreign |  | (349.3) | (74.7) | (31.4)
Total deferred (benefit) expense |  | (490.3) | (62.2) | 51.2
Total Income tax (benefit) provision |  | (420.2) | (151.4) | 481.9
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |
Computed expected income tax provision |  | 31.5 | 43.0 | 232.6
State income taxes, net of federal benefit |  | (5.4) | (8.7) | (1.3)
Foreign income taxed at lower than the federal rate |  | (78.8) | (94.0) | (208.8)
Impact of the Act - one-time transition tax, net of foreign tax credits |  | 0.0 | 13.1 | 653.7
Impact of the Act - deferred tax effects, net of valuation allowance |  | 0.0 | 0.0 | (136.7)
GILTI and foreign-derived intangible income (FDII), net of credits |  | 54.7 | 95.4 | 0.0
Business realignment of intellectual property rights | $ (334.8) | (334.8) | (90.6) | 0.0
Increases related to current year tax positions |  | 20.1 | 9.0 | 32.0
Decreases related to prior year tax positions |  | (28.5) | (75.1) | (11.3)
Share-based compensation |  | (11.1) | (13.3) | (27.2)
Research and development tax credits |  | (40.8) | (27.5) | (17.0)
Intercompany prepaid tax asset amortization |  | 0.0 | 5.2 | 7.4
Foreign exchange |  | (0.9) | 4.6 | (20.5)
Other |  | 2.4 | (2.6) | (0.5)
Change in valuation allowance |  | (28.6) | (9.9) | (20.5)
Total Income tax (benefit) provision |  | $ (420.2) | $ (151.4) | $ 481.9
Increase of basic net income per share due to release of prior year tax positions (in dollars per share) |  | $ 0.12 | $ 0.32 | $ 0.05
Increase of diluted net income per share due to release of prior year tax positions (in dollars per share) |  | $ 0.11 | $ 0.30 |

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