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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
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Statement of Cash Flows [Abstract] |  |  |
Non cash equivalent segregated assets | $ 471.1 | $ 51.8 | $ 5.8
Segregated cash and other non cash equivalent assets included with in deposits and receivables from broker dealers clearing organizations and counter parties | 2,629.5 | 2,662.0 | 2,218.3
Non segregated cash and other non cash equivalent assets included with in deposits and receivables from broker dealers clearing organizations and counter parties | $ 5,146.7 | $ 2,007.0 | $ 2,712.6

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- Definition Segregated Cash And Other Non-cash Equivalent Assets Included Within Deposits And Receivables From Broker-dealers, Clearing Organizations, And Counterparties + References No definition available. + Details
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