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Income Taxes - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2025 | Jan. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 31, 2024
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Effective tax rate |  |  |  |  | (44.40%) |  |
Unrecognized tax benefits, income tax penalties accrued |  |  | $ 103.2 | $ 135.8 | $ 103.2 | $ 135.8 |
Unrecognized tax benefits, income tax penalties and interest expense |  |  |  |  | 32.6 | 31.2 |
Unrecognized tax benefits | $ 821.2 |  | 691.3 | 821.2 | 691.3 | 821.2 | $ 792.4
Unrecognized tax benefits that would impact effective tax rate |  |  | 613.5 | $ 706.4 | $ 613.5 | $ 706.4 |
Tax benefit due to settlement reached with tax authorities |  |  | $ 24.4 |  |  |  |
Basic net income (loss) per common share (in dollars per share) |  |  | $ 0.03 | $ 0.15 | $ (0.06) | $ 0.39 |
Diluted net income (loss) per common share (in dollars per share) |  |  | 0.03 | $ 0.14 | (0.06) | $ 0.38 |
Unrecognized tax position remeasurement |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Basic net income (loss) per common share (in dollars per share) |  |  | 0.05 |  | 0.05 |  |
Diluted net income (loss) per common share (in dollars per share) |  |  | $ 0.04 |  | $ 0.05 |  |
Foreign Tax Jurisdiction | Malaysian IRB |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Income tax, estimate of possible loss | $ 410.0 |  |  |  |  |  |
Foreign Tax Jurisdiction | German Tax Authorities (GTA) |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Income tax, estimate of possible loss |  | $ 92.0 |  |  |  |  |

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