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Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk (Tables) | 9 Months Ended
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Jun. 30, 2016
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 June 30, 2016 and September 30, 2015. Assets represent net unrealized gains and liabilities represent net unrealized losses.
| June 30, 2016 |  | September 30, 2015
(in millions) | Assets (1) |  | Liabilities (1) |  | Assets (1) |  | Liabilities (1)
Derivative contracts not accounted for as hedges: |  |  |  |  |  |  |
Exchange-traded commodity derivatives | $ | 2,512.7 |  |  | $ | 2,534.0 |  |  | $ | 3,443.6 |  |  | $ | 3,313.8 |
OTC commodity derivatives | 2,954.6 |  |  | 2,782.7 |  |  | 1,621.2 |  |  | 1,650.7 |
Exchange-traded foreign exchange derivatives | 20.3 |  |  | 10.4 |  |  | 27.8 |  |  | 20.6 |
OTC foreign exchange derivatives | 933.5 |  |  | 803.5 |  |  | 892.2 |  |  | 865.4 |
Exchange-traded interest rate derivatives | 132.4 |  |  | 142.7 |  |  | 126.8 |  |  | 136.0 |
Equity index derivatives | 27.8 |  |  | 34.5 |  |  | 22.8 |  |  | 21.0 |
TBA and forward settling securities | 3.4 |  |  | 5.4 |  |  | 1.2 |  |  | 2.6 |
Gross fair value of derivative contracts | 6,584.7 |  |  | 6,313.2 |  |  | 6,135.6 |  |  | 6,010.1 |
Impact of netting and collateral | (6,315.3 | ) |  | (6,084.2 | ) |  | (6,081.7 | ) |  | (5,954.4 | )
Total fair value included in ‘Deposits with and receivables from exchange-clearing organizations’ | $ | 48.0 |  |  |  |  | $ | 76.2 |  |  |
Total fair value included in ‘Deposits with and receivables from broker-dealers, clearing organizations and counterparties’ | $ | (14.8 | ) |  |  |  | $ | (52.9 | ) |  |
Total fair value included in ‘Financial instruments owned, at fair value’ | $ | 236.2 |  |  |  |  | $ | 30.6 |  |  |
Total fair value included in ‘Payables to broker-dealers, clearing organizations and counterparties |  |  | $ | 3.5 |  |  |  |  | $ | 1.6 |
Fair value included in ‘Financial instruments sold, not yet purchased, at fair value’ |  |  | $ | 225.5 |  |  |  |  | $ | 54.1 |
(1) | As of June 30, 2016 and September 30, 2015, the Company’s derivative contract volume for open positions were approximately 3.9 million and 4.1 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 customers 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 customers with option products, including combinations of buying and selling puts and calls. The Company mitigates its risk by offsetting the customer’s transaction simultaneously with one of the Company’s trading counterparties or with a similar but not identical position on the exchange. 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 fixed income institutional business. The fair value on these transactions are recorded in receivables or payables to broker-dealers, clearing organizations and counterparties. Realized and unrealized gains and losses on securities and derivative transactions are reflected in ‘trading gains, net’. The Company enters into TBA securities transactions for the sole purpose of managing risk associated with the purchase of mortgage pass-through securities. TBA securities are included within deposits with and receivables from and payables to broker-dealers, clearing organizations and counterparties. Forward settling securities represent non-regular way securities and are included in financial instruments owned and sold. As of June 30, 2016 and September 30, 2015, these transactions are summarized as follows:
| June 30, 2016 |  | September 30, 2015
(in millions) | Gain / (Loss) |  | Notional Amounts |  | Gain / (Loss) |  | Notional Amounts
Unrealized gain on TBA securities purchased within receivables from and payables to broker-dealers, clearing organizations and counterparties and related notional amounts (1) | $ | 1.7 |  |  | $ | 539.7 |  |  | $ | 0.6 |  |  | $ | 194.6 |
Unrealized loss on TBA securities purchased within receivables from and payables to broker-dealers, clearing organizations and counterparties and related notional amounts (1) | $ | (0.2 | ) |  | $ | 199.7 |  |  | $ | (0.2 | ) |  | $ | 163.7 |
Unrealized gain on TBA securities sold within receivables from and payables to broker-dealers, clearing organizations and counterparties and related notional amounts (1) | $ | 0.2 |  |  | $ | (279.4 | ) |  | $ | 0.4 |  |  | $ | (314.1 | )
Unrealized loss on TBA securities sold within receivables from and payables to broker-dealers, clearing organizations and counterparties and related notional amounts (1) | $ | (4.0 | ) |  | $ | (1,184.8 | ) |  | $ | (2.0 | ) |  | $ | (563.8 | )
Unrealized gain on forward settling securities purchased within receivables from and payables to broker-dealers, clearing organizations and counterparties and related notional amounts | $ | 1.5 |  |  | $ | 481.6 |  |  | $ | 0.1 |  |  | $ | 163.4 |
Unrealized gain on forward settling securities sold within receivables from and payables to broker-dealers, clearing organizations and counterparties and related notional amounts | $ | (1.2 | ) |  | $ | (595.2 | ) |  | $ | (0.4 | ) |  | $ | (286.3 | )
(1) The notional amounts of these instruments reflect the extent of the Company's involvement in TBA 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 nine months ended June 30, 2016 and 2015, in accordance with the Derivatives and Hedging Topic of the ASC. The gains set forth below are included in ‘trading gains, net’ in the condensed consolidated income statements.
| Three Months Ended June 30, |  | Nine Months Ended June 30,
(in millions) | 2016 |  | 2015 |  | 2016 |  | 2015
Commodities | $ | 5.6 |  |  | $ | 20.6 |  |  | $ | 30.6 |  |  | $ | 67.0 |
Foreign exchange | 0.2 |  |  | 1.1 |  |  | 3.8 |  |  | 5.0 |
Interest rate | 1.0 |  |  | 0.5 |  |  | 2.0 |  |  | 0.6 |
TBA and forward settling securities | (6.6 | ) |  | 0.7 |  |  | (11.6 | ) |  | 3.2 |
Net gains from derivative contracts | $ | 0.2 |  |  | $ | 22.9 |  |  | $ | 24.8 |  |  | $ | 75.8 |

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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=56946850&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=56946850&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=56946850&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=56946850&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=56946850&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=56946850&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=56946850&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=56946850&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=56946850&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 9: 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=56946850&loc=SL5579240-113959 Reference 10: 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=56946850&loc=d3e41620-113959 Reference 11: 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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