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Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Gross Derivative Assets and Liabilities by Type and Balance Sheet Location (Details) contract in Millions, $ in Millions | Jun. 30, 2024 USD ($) contract | Sep. 30, 2023 USD ($) contract
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | $ 7,914.6 | $ 8,200.3
Derivative liability, fair value, gross liability | 7,740.3 | 8,017.3
Impact of netting and collateral asset | (7,097.5) | (7,731.3)
Impact of netting and collateral liability | $ (7,021.8) | $ (7,639.0)
Derivative, number of instruments held | contract | 11.2 | 13.4
Total fair value included in Deposits with and receivables from broker-dealers, clearing organizations, and counterparties, net |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | $ 495.4 | $ 206.7
Total fair value included in Receivable from clients, net |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | (0.5) | (7.9)
Total fair value included in Financial instruments owned, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 322.2 | 270.2
Total fair value included in Payables to clients |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 387.3 | 79.8
Total fair value included in Payables to broker-dealers, clearing organizations and counterparties |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 3.6 | 10.2
Total fair value included in Financial instruments sold, not yet purchased, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 327.6 | 288.3
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 7,909.1 | 8,198.6
Derivative liability, fair value, gross liability | 7,738.2 | 7,990.2
Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 5.5 | 1.7
Derivative liability, fair value, gross liability | 2.1 | 27.1
Exchange-traded commodity derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 1,698.9 | 1,907.0
Derivative liability, fair value, gross liability | 1,701.7 | 1,890.3
OTC commodity derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 2,031.7 | 1,523.3
Derivative liability, fair value, gross liability | 1,972.5 | 1,456.0
Exchange-traded foreign exchange derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 1.4 | 4.3
Derivative liability, fair value, gross liability | 1.4 | 4.3
OTC foreign exchange derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 613.2 | 497.1
Derivative liability, fair value, gross liability | 577.5 | 455.3
Exchange-traded interest rate derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 566.2 | 1,507.6
Derivative liability, fair value, gross liability | 572.0 | 1,509.8
OTC interest rate derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 288.3 | 417.6
Derivative liability, fair value, gross liability | 288.3 | 417.6
OTC interest rate derivatives | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 0.0 | 0.0
Derivative liability, fair value, gross liability | 2.0 | 24.6
Exchange-traded equity index derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 2,520.8 | 2,140.9
Derivative liability, fair value, gross liability | 2,520.8 | 2,140.9
OTC equity and indices derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 163.2 | 127.3
Derivative liability, fair value, gross liability | 77.8 | 68.5
TBA and forward settling securities | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 25.4 | 73.5
Derivative liability, fair value, gross liability | 26.2 | 47.5
Foreign currency forward contracts | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 5.5 | 1.7
Derivative liability, fair value, gross liability | $ 0.1 | $ 2.5

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