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Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk (Tables) | 6 Months Ended
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Mar. 31, 2019
Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk [Abstract] |
Schedule of Derivative Instruments [Table Text Block] | Listed below are the fair values of the Company’s derivative assets and liabilities as of March 31, 2019 and September 30, 2018. Assets represent net unrealized gains and liabilities represent net unrealized losses.
| March 31, 2019 |  | September 30, 2018
(in millions) | Assets (1) |  | Liabilities (1) |  | Assets (1) |  | Liabilities (1)
Derivative contracts not accounted for as hedges: |  |  |  |  |  |  |
Exchange-traded commodity derivatives | $ | 1,360.9 |  |  | $ | 1,312.7 |  |  | $ | 2,455.7 |  |  | $ | 2,499.3 |
OTC commodity derivatives | 83.1 |  |  | 123.0 |  |  | 207.0 |  |  | 369.9 |
Exchange-traded foreign exchange derivatives | 62.0 |  |  | 57.3 |  |  | 49.8 |  |  | 37.2 |
OTC foreign exchange derivatives | 373.0 |  |  | 353.5 |  |  | 302.5 |  |  | 303.9 |
Exchange-traded interest rate derivatives | 592.5 |  |  | 693.1 |  |  | 449.3 |  |  | 478.7 |
OTC interest rate derivatives | 20.9 |  |  | 22.9 |  |  | 24.8 |  |  | 25.9 |
Exchange-traded equity index derivatives | 1,539.7 |  |  | 1,439.8 |  |  | 4,541.8 |  |  | 4,794.0 |
TBA and forward settling securities | 12.1 |  |  | 16.7 |  |  | 5.0 |  |  | 2.1 |
Gross fair value of derivative contracts | 4,044.2 |  |  | 4,019.0 |  |  | 8,035.9 |  |  | 8,511.0 |
Impact of netting and collateral | (3,857.1 | ) |  | (3,801.8 | ) |  | (8,118.5 | ) |  | (8,317.6 | )
Total fair value included in 'Deposits with and receivables from broker-dealers, clearing organizations, and counterparties' | $ | (16.6 | ) |  |  |  | $ | (268.7 | ) |  |
Total fair value included in 'Financial instruments owned, at fair value | $ | 203.7 |  |  |  |  | $ | 186.1 |  |  |
Total fair value included in 'Payables to broker-dealers, clearing organizations and counterparties |  |  | $ | 15.8 |  |  |  |  | $ | — |
Fair value included in 'Financial instruments sold, not yet purchased, at fair value' |  |  | $ | 201.4 |  |  |  |  | $ | 193.4 |
(1) | As of March 31, 2019 and September 30, 2018, the Company’s derivative contract volume for open positions were approximately 11.0 million and 10.6 million contracts, respectively.
The Company’s derivative contracts are principally held in its Commercial Hedging and Clearing and Execution Services segments. The Company assists its Commercial Hedging segment clients in protecting the value of their future production by entering into option or forward agreements with them on an OTC basis. The Company also provides its Commercial Hedging segment clients with option products, including combinations of buying and selling puts and calls. The Company mitigates its risk by offsetting the client’s transaction simultaneously with one of the Company’s trading counterparties or with a similar but not identical exchange-traded position. The risk mitigation of these offsetting trades is not within the documented hedging designation requirements of the Derivatives and Hedging Topic of the ASC. These derivative contracts are traded along with cash transactions because of the integrated nature of the markets for these products. The Company manages the risks associated with derivatives on an aggregate basis along with the risks associated with its proprietary trading and market-making activities in cash instruments as part of its firm-wide risk management policies. In particular, the risks related to derivative positions may be partially offset by inventory, unrealized gains in inventory or cash collateral paid or received. The Company has derivative instruments, which consist of mortgage-backed TBA securities and forward settling transactions that are used to manage risk exposures in the trading inventory of the Company’s domestic institutional fixed income business. The fair value on these transactions are recorded in deposits with and receivables from or payables to broker-dealers, clearing organizations and counterparties. Realized and unrealized gains and losses on securities and derivative transactions are reflected in ‘principal gains, net’. As of March 31, 2019 and September 30, 2018, these transactions are summarized as follows:
| March 31, 2019 |  | September 30, 2018
(in millions) | Gain / (Loss) |  | Notional Amounts |  | Gain / (Loss) |  | Notional Amounts
Unrealized gain on TBA securities purchased within deposits with and receivables from broker-dealers, clearing organizations and counterparties and related notional amounts | $ | 7.1 |  |  | $ | 1,397.6 |  |  | $ | 1.2 |  |  | $ | 721.5 |
Unrealized loss on TBA securities purchased within deposits with and receivables from broker-dealers, clearing organizations and counterparties and related notional amounts | $ | (0.4 | ) |  | $ | 451.8 |  |  | $ | (0.6 | ) |  | $ | 293.2 |
Unrealized gain on TBA securities sold within deposits with and receivables from broker-dealers, clearing organizations and counterparties and related notional amounts | $ | — |  |  | $ | — |  |  | $ | 3.2 |  |  | $ | (1,099.5 | )
Unrealized gain on TBA securities sold within payables to broker-dealers, clearing organizations and counterparties and related notional amounts | $ | 0.5 |  |  | $ | (425.4 | ) |  | $ | — |  |  | $ | — |
Unrealized loss on TBA securities sold within payables to broker-dealers, clearing organizations and counterparties and related notional amounts | $ | (13.7 | ) |  | $ | (2,260.8 | ) |  | $ | — |  |  | $ | — |
Unrealized loss on TBA securities sold within deposits with and receivables from broker-dealers, clearing organizations and counterparties and related notional amounts | $ | — |  |  | $ | — |  |  | $ | (1.5 | ) |  | $ | (812.7 | )
Unrealized gain on forward settling securities purchased within deposits with and receivables from broker-dealers, clearing organizations and counterparties and related notional amounts | $ | 4.5 |  |  | 1,258.1 |  |  | $ | 0.5 |  |  | $ | 614.3 |
Unrealized loss on forward settling securities sold within payables to broker-dealers, clearing organizations and counterparties and related notional amounts | $ | (2.6 | ) |  | (1,172.7 | ) |  | $ | — |  |  | $ | — |
Unrealized gain on forward settling securities sold within deposits with and receivables from broker-dealers, clearing organizations and counterparties and related notional amounts | $ | — |  |  | — |  |  | $ | 0.1 |  |  | $ | (427.2 | )
(1) The notional amounts of these instruments reflect the extent of the Company's involvement in TBA and forward settling securities and do not represent risk of loss due to counterparty non-performance. |  |  |  |  |  |  |
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block] | The following table sets forth the Company’s gains (losses) related to derivative financial instruments for the three and six months ended March 31, 2019 and 2018 in accordance with the Derivatives and Hedging Topic of the ASC. The net gains set forth below are included in ‘Cost of sales of physical commodities’ and ‘principal gains, net’ in the condensed consolidated income statements.
| Three Months Ended March 31, |  | Six Months Ended March 31,
(in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Commodities | $ | 36.0 |  |  | $ | 12.3 |  |  | $ | 44.1 |  |  | $ | 33.8 |
Foreign exchange | 1.8 |  |  | 2.5 |  |  | 3.7 |  |  | 4.8 |
Equity | 0.7 |  |  | — |  |  | (2.6 | ) |  | — |
Interest rate | — |  |  | 0.2 |  |  | — |  |  | 0.6 |
TBA and forward settling securities | 10.6 |  |  | 10.7 |  |  | 1.3 |  |  | 10.3 |
Net gains from derivative contracts | $ | 49.1 |  |  | $ | 25.7 |  |  | $ | 46.5 |  |  | $ | 49.5 |

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- Definition Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41641-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579240-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41620-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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