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Income Taxes (Tables) | 6 Months Ended
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Sep. 30, 2025
Income Tax Disclosure [Abstract] |
Rollforward of Unrecognized Tax Benefits | The following table summarizes the activity related to the Company's gross unrecognized tax benefits for the six months ended September 30, 2025 and the year ended March 31, 2025 (in millions):
| September 30, |  | March 31, |  |
| 2025 |  | 2025 |  |
Beginning gross unrecognized tax benefit | $ | 821.2 |  |  | $ | 792.4 |  |  |
Decreases related to settlements with tax authorities | (50.4) |  |  | (0.7) |  |  |
Decreases related to statute of limitation expirations | (5.1) |  |  | (6.9) |  |  |
Increases related to current year tax positions | 8.8 |  |  | 27.1 |  |  |
Increases (decreases) related to prior year tax positions | (83.2) |  |  | 9.3 |  |  |
Ending gross unrecognized tax benefits | $ | 691.3 |  |  | $ | 821.2 |  |  |

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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A + Details
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