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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) country in Millions, $ in Millions | Sep. 30, 2021 USD ($) country | Sep. 30, 2020 USD ($) country
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | $ 5,760.7 | $ 3,264.4
Derivative liability, fair value, gross liability | 5,628.1 | 3,069.5
Gross fair value of derivative contracts | (5,353.9) | (3,319.0)
Gross fair value of derivative contracts | $ (4,955.4) | $ (3,100.7)
Derivative, number of instruments held | country | 11.1 | 7.9
Deposits and Receivables from Exchange Clearing Organizations |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | $ 259.9 | $ (173.5)
Receivable From Clients, Net |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 2.6 | 1.5
Financial Instruments Owned |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 144.3 | 117.4
Payables To Clients |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 291.5 | (222.7)
Payables to Broker-dealers, Clearing Organizations and Counterparties |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 12.7 | 14.7
Financial Instrument Sold, Not Yet Purchased |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 368.5 | 176.8
Exchange-traded commodity derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 3,904.1 | 1,637.2
Derivative liability, fair value, gross liability | 3,904.7 | 1,747.3
OTC commodity derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 803.4 | 553.9
Derivative liability, fair value, gross liability | 761.3 | 433.2
Exchange-traded foreign exchange derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 119.9 | 9.3
Derivative liability, fair value, gross liability | 119.9 | 13.0
OTC foreign exchange derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 216.9 | 520.8
Derivative liability, fair value, gross liability | 185.5 | 461.5
Exchange-traded interest rate derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 245.9 | 271.1
Derivative liability, fair value, gross liability | 249.0 | 200.7
OTC interest rate derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 56.4 | 96.0
Derivative liability, fair value, gross liability | 54.9 | 96.6
Exchange-traded equity index derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 206.5 | 32.1
Derivative liability, fair value, gross liability | 206.5 | 39.8
OTC equity and indices derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 148.5 | 113.0
Derivative liability, fair value, gross liability | 94.1 | 55.4
TBA and forward settling securities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 59.1 | 31.0
Derivative liability, fair value, gross liability | $ 52.2 | $ 22.0

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