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Description of Business, Basis of Presentation and Significant Accounting Policies - Schedule of reconciliation of the impacted financial statement (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net Cash Flows Provided by Financing Activities | $ 167.0 | $ (298.1) | $ (74.9) | $ (394.5) | $ 525.5 |
Net Change In Cash, Cash Equivalents and Restricted Cash | (66.3) | (32.7) | 82.2 | (17.1) | (90.2) |
Cash, Cash Equivalents and Restricted Cash - End Of Period | $ 270.4 | $ 218.3 | $ 334.4 | $ 251.4 | 270.3 | $ 361.3
As Previously Reported |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net Cash Flows Provided by Financing Activities |  |  |  |  | 644.2 |
Net Change In Cash, Cash Equivalents and Restricted Cash |  |  |  |  | 28.5 |
Cash, Cash Equivalents and Restricted Cash - End Of Period |  |  |  |  | 389.0 |
Revision of Prior Period, Adjustment |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |
Net Cash Flows Provided by Financing Activities |  |  |  |  | (118.7) |
Net Change In Cash, Cash Equivalents and Restricted Cash |  |  |  |  | (118.7) |
Cash, Cash Equivalents and Restricted Cash - End Of Period |  |  |  |  | $ (118.7) |

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- Definition Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-24 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 1 -SubTopic 230 -Topic 830 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477401/830-230-45-1 + Details
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