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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 | Sep. 30, 2023 USD ($) contract | Sep. 30, 2022 USD ($) contract
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | $ 8,200.3 | $ 9,657.2
Derivative liability, fair value, gross liability | 8,017.3 | 9,552.4
Impact of netting and collateral asset | (7,731.3) | (10,920.8)
Impact of netting and collateral liability | $ (7,639.0) | $ (10,505.0)
Derivative, number of instruments held | contract | 13.4 | 13.3
Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | $ 8,198.6 | $ 9,657.2
Derivative liability, fair value, gross liability | 7,990.2 | 9,481.8
Designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 1.7 | 0.0
Derivative liability, fair value, gross liability | 27.1 | 70.6
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 | 206.7 | (1,455.7)
Total fair value included in Receivable from clients, net |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | (7.9) | (0.5)
Total fair value included in Financial instruments owned, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 270.2 | 192.6
Total fair value included in Payables to clients |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 79.8 | (1,392.4)
Total fair value included in Payables to broker-dealers, clearing organizations and counterparties |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 10.2 | 55.8
Fair value included in Financial instruments sold, not yet purchased, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 288.3 | 384.0
Exchange-traded commodity derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 1,907.0 | 4,520.4
Derivative liability, fair value, gross liability | 1,890.3 | 4,519.3
OTC commodity derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 1,523.3 | 756.9
Derivative liability, fair value, gross liability | 1,456.0 | 695.6
Exchange-traded foreign exchange derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 4.3 | 25.6
Derivative liability, fair value, gross liability | 4.3 | 25.7
OTC foreign exchange derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 497.1 | 577.1
Derivative liability, fair value, gross liability | 455.3 | 549.3
Exchange-traded interest rate derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 1,507.6 | 2,626.8
Derivative liability, fair value, gross liability | 1,509.8 | 2,626.7
OTC interest rate derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 417.6 | 168.9
Derivative liability, fair value, gross liability | 417.6 | 205.1
OTC interest rate derivatives | Designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross liability | 24.6 | 48.8
Exchange-traded equity index derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 2,140.9 | 609.5
Derivative liability, fair value, gross liability | 2,140.9 | 609.5
OTC equity and indices derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 127.3 | 164.4
Derivative liability, fair value, gross liability | 68.5 | 95.7
TBA and forward settling securities | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 73.5 | 207.6
Derivative liability, fair value, gross liability | 47.5 | 154.9
Interest rate swaps | 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 | 24.6 | 48.8
Foreign currency forwards | Designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 1.7 | 0.0
Derivative liability, fair value, gross liability | $ 2.5 | $ 21.8

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