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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) - USD ($) $ in Millions | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 3,715.9 | $ 6,135.6
Derivative Liability, Fair Value, Gross Liability | 3,580.5 | 6,010.1
Derivative, Fair Value, Net | 210.9 |
Exchange-traded Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 2,022.1 | 3,443.6
Derivative Liability, Fair Value, Gross Liability | 1,920.5 | 3,313.8
Over the Counter (OTC) Commodity Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 1,217.0 | 1,621.2
Derivative Liability, Fair Value, Gross Liability | 1,188.9 | 1,650.7
Foreign Exchange Forward [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 12.2 | 27.8
Derivative Liability, Fair Value, Gross Liability | 7.5 | 20.6
Over the Counter (OTC) Foreign Exchange Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 346.5 | 892.2
Derivative Liability, Fair Value, Gross Liability | 290.2 | 865.4
Exchange-traded interest rate contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 78.7 | 126.8
Derivative Liability, Fair Value, Gross Liability | 120.5 | 136.0
Equity Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 39.1 | 22.8
Derivative Liability, Fair Value, Gross Liability | 50.3 | 21.0
TBA and forward settling securities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 0.3 | 1.2
Derivative Liability, Fair Value, Gross Liability | 2.6 | 2.6
TBA securities purchased [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 0.8 |
Derivative Liability, Fair Value, Gross Liability | (0.8) |
Derivative Asset, Notional Amount | (289.8) |
Derivative Liability, Notional Amount | (485.5) |
TBA securities sold [Member] [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 1.3 |
Derivative Liability, Fair Value, Gross Liability | (1.7) |
Derivative Asset, Notional Amount | (702.3) |
Derivative Liability, Notional Amount | (754.3) |
Forward settling securities purchased [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 0.1 |
Derivative Asset, Notional Amount | (607.9) |
Forward settling securities sold [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 0.2 |
Derivative Liability, Notional Amount | (470.4) |
Deposits and receivables from exchange clearing organizations [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Fair Value, Net | (116.3) | 76.2
Deposits and receivables from broker-dealers, clearing organizations and counterparties [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Fair Value, Net | (15.2) | (52.9)
Financial instruments owned [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Fair Value, Net | 193.9 | 30.6
Payable to broker-dealers, clearing organizations and counterparties [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Fair Value, Net | 3.5 | 1.6
Financial instrument sold, not yet purchased [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative, Fair Value, Net | 210.9 | 54.1
Counterparty And Cash Collateral Netting Adjustment [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral | (3,653.5) | (6,081.7)
Derivative Liability, Fair Value, Amount Offset Against Collateral | $ (3,366.1) | $ (5,954.4)

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=51814546&loc=SL51823488-111719 + Details
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