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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 | Dec. 31, 2020 USD ($) contract | Sep. 30, 2020 USD ($) contract
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | $ 3,170.4 | $ 3,264.4
Derivative liability, fair value, gross liability | 2,916.5 | 3,069.5
Gross fair value of derivative contracts | (3,053.1) | (3,319.0)
Gross fair value of derivative contracts | $ (2,767.4) | $ (3,100.7)
Derivative, number of instruments held | contract | 7.4 | 7.9
Deposits and Receivables from Exchange Clearing Organizations |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | $ (11.8) | $ (173.5)
Receivable From Clients, Net |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 2.2 | 1.5
Financial Instruments Owned |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 126.9 | 117.4
Payables To Clients |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | (121.3) | (222.7)
Payables to Broker-dealers, Clearing Organizations and Counterparties |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 30.6 | 14.7
Financial Instrument Sold, Not Yet Purchased |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, fair value, net | 239.8 | 176.8
Exchange-traded commodity derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 1,594.0 | 1,637.2
Derivative liability, fair value, gross liability | 1,600.9 | 1,747.3
OTC commodity derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 763.2 | 553.9
Derivative liability, fair value, gross liability | 647.4 | 433.2
Exchange-traded foreign exchange derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 32.8 | 9.3
Derivative liability, fair value, gross liability | 44.4 | 13.0
OTC foreign exchange derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 378.1 | 520.8
Derivative liability, fair value, gross liability | 303.2 | 461.5
Exchange-traded interest rate derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 88.6 | 271.1
Derivative liability, fair value, gross liability | 86.3 | 200.7
OTC interest rate derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 84.5 | 96.0
Derivative liability, fair value, gross liability | 84.9 | 96.6
Exchange-traded equity index derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 51.1 | 32.1
Derivative liability, fair value, gross liability | 28.2 | 39.8
OTC equity and indices derivatives |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 149.9 | 113.0
Derivative liability, fair value, gross liability | 90.4 | 55.4
TBA and forward settling securities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 28.2 | 31.0
Derivative liability, fair value, gross liability | $ 30.8 | $ 22.0

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