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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Unrecognized Tax Benefits [Roll Forward] |  |  |
Beginning gross unrecognized tax benefit | $ 792.4 | $ 848.0 | $ 804.1
Decreases related to settlements with tax authorities | (0.7) | (5.8) | (0.4)
Decreases related to statute of limitation expirations | (6.9) | (3.3) | (11.7)
Increases related to current year tax positions | 27.1 | 37.4 | 65.9
Increases related to prior year tax positions | 9.3 |  |
Decreases related to prior year tax positions |  | (83.9) | (9.9)
Ending gross unrecognized tax benefits | $ 821.2 | $ 792.4 | $ 848.0

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- Definition Amount of 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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + Details
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