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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 | Mar. 31, 2022 USD ($) contract | Sep. 30, 2021 USD ($) contract
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | $ 12,036.2 | $ 5,760.7
Derivative liability, fair value, gross liability | 11,843.3 | 5,628.1
Impact of netting and collateral asset | (11,962.5) | (5,353.9)
Impact of netting and collateral liability | $ (11,853.0) | $ (4,955.4)
Derivative, number of instruments held | contract | 12.6 | 11.1
Deposits and Receivables from Exchange Clearing Organizations |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | $ (83.1) | $ 259.9
Receivable From Clients, Net |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | (15.5) | 2.6
Financial Instruments Owned |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 172.3 | 144.3
Payables to Clients |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | (546.1) | 291.5
Payables to Broker-dealers, Clearing Organizations and Counterparties |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 52.0 | 12.7
Financial Instrument Sold, Not Yet Purchased |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 484.4 | 368.5
Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 12,036.2 | 5,760.7
Derivative liability, fair value, gross liability | 11,819.0 | 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 | 24.3 | 0.0
Exchange-traded commodity derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 5,901.8 | 3,904.1
Derivative liability, fair value, gross liability | 5,911.7 | 3,904.7
OTC commodity derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 1,276.5 | 803.4
Derivative liability, fair value, gross liability | 1,205.0 | 761.3
Exchange-traded foreign exchange derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 109.5 | 119.9
Derivative liability, fair value, gross liability | 109.5 | 119.9
OTC foreign exchange derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 645.9 | 216.9
Derivative liability, fair value, gross liability | 577.4 | 185.5
Exchange-traded interest rate derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 3,431.1 | 245.9
Derivative liability, fair value, gross liability | 3,435.1 | 249.0
OTC interest rate derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 83.5 | 56.4
Derivative liability, fair value, gross liability | 76.2 | 54.9
OTC interest rate derivatives | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 0.0 |
Exchange-traded equity index derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 291.0 | 206.5
Derivative liability, fair value, gross liability | 291.0 | 206.5
OTC equity and indices derivatives | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 144.7 | 148.5
Derivative liability, fair value, gross liability | 92.8 | 94.1
TBA and forward settling securities | Not Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 152.2 | 59.1
Derivative liability, fair value, gross liability | 120.3 | 52.2
Interest rate contracts | 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 |  | $ 0.0

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