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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, 2022 USD ($) contract | Sep. 30, 2021 USD ($) contract
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | $ 9,657.2 | $ 5,760.7
Derivative liability, fair value, gross liability | 9,552.4 | 5,628.1
Impact of netting and collateral asset | (10,920.8) | (5,353.9)
Impact of netting and collateral liability | $ (10,505.0) | $ (4,955.4)
Derivative, number of instruments held | contract | 13.3 | 11.1
Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | $ 9,657.2 | $ 5,760.7
Derivative liability, fair value, gross liability | 9,481.8 | 5,628.1
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 | 70.6 | 0.0
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 | (1,455.7) | 259.9
Total fair value included in Receivables from clients, net |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | (0.5) | 2.6
Total fair value included in Financial instruments owned, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 192.6 | 144.3
Total fair value included in Payables to clients |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | (1,392.4) | 291.5
Total fair value included in Payables to broker-dealers, clearing organizations and counterparties |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 55.8 | 12.7
Fair value included in Financial instruments sold, not yet purchased, at fair value |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 384.0 | 368.5
Exchange-traded commodity derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 4,520.4 | 3,904.1
Derivative liability, fair value, gross liability | 4,519.3 | 3,904.7
OTC commodity derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 756.9 | 803.4
Derivative liability, fair value, gross liability | 695.6 | 761.3
Exchange-traded foreign exchange derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 25.6 | 119.9
Derivative liability, fair value, gross liability | 25.7 | 119.9
OTC foreign exchange derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 577.1 | 216.9
Derivative liability, fair value, gross liability | 549.3 | 185.5
Exchange-traded interest rate derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 2,626.8 | 245.9
Derivative liability, fair value, gross liability | 2,626.7 | 249.0
OTC interest rate derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 168.9 | 56.4
Derivative liability, fair value, gross liability | 205.1 | 54.9
OTC interest rate derivatives | Designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, fair value, gross liability | 48.8 |
Exchange-traded equity index derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 609.5 | 206.5
Derivative liability, fair value, gross liability | 609.5 | 206.5
OTC equity and indices derivatives | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 164.4 | 148.5
Derivative liability, fair value, gross liability | 95.7 | 94.1
TBA and forward settling securities | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 207.6 | 59.1
Derivative liability, fair value, gross liability | 154.9 | 52.2
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 | 48.8 | 0.0
Foreign currency forwards | 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 | $ 21.8 | $ 0.0

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