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Assets and Liabilities, at Fair Value (Tables) | 3 Months Ended
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Dec. 31, 2024
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets Measured on Recurring Basis | The following tables set forth the Company’s financial and nonfinancial assets and liabilities accounted for at fair value, on a recurring basis, as of December 31, 2024 and September 30, 2024 by level in the fair value hierarchy. All fair value measurements were performed on a recurring basis as of December 31, 2024 and September 30, 2024.
| December 31, 2024
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Netting (1) |  | Total
Assets: |  |  |  |  |  |  |  |  |
Certificates of deposit | $ | 10.2 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 10.2 |
Money market mutual funds | 35.6 |  |  | — |  |  | — |  |  | — |  |  | 35.6 |
Cash and cash equivalents | 45.8 |  |  | — |  |  | — |  |  | — |  |  | 45.8 |
Commodities warehouse receipts | 9.1 |  |  | — |  |  | — |  |  | — |  |  | 9.1 |
U.S. Treasury obligations | 299.9 |  |  | — |  |  | — |  |  | — |  |  | 299.9 |
Securities and other assets segregated under federal and other regulations | 309.0 |  |  | — |  |  | — |  |  | — |  |  | 309.0 |
U.S. Treasury obligations | 4,241.5 |  |  | — |  |  | — |  |  | — |  |  | 4,241.5 |
To be announced and forward settling securities | — |  |  | 74.0 |  |  | — |  |  | (24.7) |  |  | 49.3 |
Foreign government obligations | 16.7 |  |  | — |  |  | — |  |  | — |  |  | 16.7 |
Derivatives | 3,706.9 |  |  | 2,789.7 |  |  | — |  |  | (6,022.8) |  |  | 473.8 |
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net | 7,965.1 |  |  | 2,863.7 |  |  | — |  |  | (6,047.5) |  |  | 4,781.3 |
Receivables from clients, net - Derivatives | (7.0) |  |  | 499.5 |  |  | — |  |  | (495.3) |  |  | (2.8) |
Equity securities | 515.9 |  |  | 24.4 |  |  | — |  |  | — |  |  | 540.3 |
Corporate and municipal bonds | — |  |  | 475.6 |  |  | — |  |  | — |  |  | 475.6 |
U.S. Treasury obligations | 623.7 |  |  | — |  |  | — |  |  | — |  |  | 623.7 |
U.S. government agency obligations | — |  |  | 488.7 |  |  | — |  |  | — |  |  | 488.7 |
Foreign government obligations | 0.8 |  |  | — |  |  | — |  |  | — |  |  | 0.8 |
Agency mortgage-backed obligations | — |  |  | 4,197.1 |  |  | — |  |  | — |  |  | 4,197.1 |
Asset-backed obligations | — |  |  | 265.5 |  |  | — |  |  | — |  |  | 265.5 |
Derivatives | — |  |  | 819.2 |  |  | — |  |  | (593.2) |  |  | 226.0 |
Commodities warehouse receipts | 61.0 |  |  | — |  |  | — |  |  | — |  |  | 61.0 |
Exchange firm common stock | 13.9 |  |  | — |  |  | — |  |  | — |  |  | 13.9 |
Cash flow hedges | — |  |  | 1.2 |  |  | — |  |  | — |  |  | 1.2 |
Mutual funds and other | 22.2 |  |  | — |  |  | 2.1 |  |  | — |  |  | 24.3 |
Financial instruments owned | 1,237.5 |  |  | 6,271.7 |  |  | 2.1 |  |  | (593.2) |  |  | 6,918.1 |
Physical commodities inventory | 201.0 |  |  | 275.7 |  |  | — |  |  | — |  |  | 476.7 |
Total assets at fair value | $ | 9,751.4 |  |  | $ | 9,910.6 |  |  | $ | 2.1 |  |  | $ | (7,136.0) |  |  | $ | 12,528.1 |
Liabilities: |  |  |  |  |  |  |  |  |
Accounts payable and other accrued liabilities | $ | — |  |  | $ | — |  |  | $ | 2.9 |  |  | $ | — |  |  | $ | 2.9 |
Payables to clients - Derivatives | 3,401.7 |  |  | 240.5 |  |  | — |  |  | (3,271.1) |  |  | 371.1 |
To be announced and forward settling securities | — |  |  | 30.9 |  |  | — |  |  | (15.0) |  |  | 15.9 |
Derivatives | 279.3 |  |  | 2,969.4 |  |  | — |  |  | (3,227.1) |  |  | 21.6 |
Payable to broker-dealers, clearing organizations and counterparties | 279.3 |  |  | 3,000.3 |  |  | — |  |  | (3,242.1) |  |  | 37.5 |
Equity securities | 420.3 |  |  | 9.5 |  |  | — |  |  | — |  |  | 429.8 |
Foreign government obligations | 0.8 |  |  | — |  |  | — |  |  | — |  |  | 0.8 |
Corporate and municipal bonds | — |  |  | 230.3 |  |  | — |  |  | — |  |  | 230.3 |
U.S. Treasury obligations | 2,583.2 |  |  | — |  |  | — |  |  | — |  |  | 2,583.2 |
U.S. government agency obligations | — |  |  | 0.2 |  |  | — |  |  | — |  |  | 0.2 |
Agency mortgage-backed obligations | — |  |  | 1.7 |  |  | — |  |  | — |  |  | 1.7 |
Asset-backed obligations | — |  |  | 5.0 |  |  | — |  |  | — |  |  | 5.0 |
Derivatives | 3.3 |  |  | 798.8 |  |  | — |  |  | (513.2) |  |  | 288.9 |
Cash flow hedges | — |  |  | 0.9 |  |  | — |  |  | — |  |  | 0.9 |
Other | — |  |  | — |  |  | 0.8 |  |  | — |  |  | 0.8 |
Financial instruments sold, not yet purchased | 3,007.6 |  |  | 1,046.4 |  |  | 0.8 |  |  | (513.2) |  |  | 3,541.6 |
Total liabilities at fair value | $ | 6,688.6 |  |  | $ | 4,287.2 |  |  | $ | 3.7 |  |  | $ | (7,026.4) |  |  | $ | 3,953.1 |
(1)Represents cash collateral and the impact of netting across at each level of the fair value hierarchy.
| September 30, 2024
(in millions) | Level 1 |  | Level 2 |  | Level 3 |  | Netting (1) |  | Total
Assets: |  |  |  |  |  |  |  |  |
Certificates of deposit | $ | 13.9 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 13.9 |
Money market mutual funds | 35.3 |  |  | — |  |  | — |  |  | — |  |  | 35.3 |
Cash and cash equivalents | 49.2 |  |  | — |  |  | — |  |  | — |  |  | 49.2 |
Commodities warehouse receipts | 51.8 |  |  | — |  |  | — |  |  | — |  |  | 51.8 |
Securities and other assets segregated under federal and other regulations | 51.8 |  |  | — |  |  | — |  |  | — |  |  | 51.8 |
U.S. Treasury obligations | 2,933.2 |  |  | — |  |  | — |  |  | — |  |  | 2,933.2 |
To be announced and forward settling securities | — |  |  | 26.1 |  |  | — |  |  | (18.3) |  |  | 7.8 |
Foreign government obligations | 18.3 |  |  | — |  |  | — |  |  | — |  |  | 18.3 |
Derivatives | 3,900.1 |  |  | 2,168.2 |  |  | — |  |  | (5,740.1) |  |  | 328.2 |
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net | 6,851.6 |  |  | 2,194.3 |  |  | — |  |  | (5,758.4) |  |  | 3,287.5 |
Receivables from clients, net - Derivatives | 22.4 |  |  | 506.2 |  |  | — |  |  | (537.0) |  |  | (8.4) |
Equity securities | 363.9 |  |  | 15.0 |  |  | — |  |  | — |  |  | 378.9 |
Corporate and municipal bonds | — |  |  | 322.1 |  |  | — |  |  | — |  |  | 322.1 |
U.S. Treasury obligations | 1,088.6 |  |  | — |  |  | — |  |  | — |  |  | 1,088.6 |
U.S. government agency obligations | — |  |  | 531.0 |  |  | — |  |  | — |  |  | 531.0 |
Foreign government obligations | 41.4 |  |  | — |  |  | — |  |  | — |  |  | 41.4 |
Agency mortgage-backed obligations | — |  |  | 3,837.2 |  |  | — |  |  | — |  |  | 3,837.2 |
Asset-backed obligations | — |  |  | 223.5 |  |  | — |  |  | — |  |  | 223.5 |
Derivatives | 0.1 |  |  | 603.2 |  |  | — |  |  | (375.2) |  |  | 228.1 |
Commodities warehouse receipts | 67.8 |  |  | — |  |  | — |  |  | — |  |  | 67.8 |
Exchange firm common stock | 13.2 |  |  | — |  |  | — |  |  | — |  |  | 13.2 |
Cash flow hedges | — |  |  | 9.6 |  |  | — |  |  | — |  |  | 9.6 |
Mutual funds and other | 23.6 |  |  | — |  |  | 2.1 |  |  | — |  |  | 25.7 |
Financial instruments owned | 1,598.6 |  |  | 5,541.6 |  |  | 2.1 |  |  | (375.2) |  |  | 6,767.1 |
Physical commodities inventory | 207.6 |  |  | 169.0 |  |  | — |  |  | — |  |  | 376.6 |
Total assets at fair value | $ | 8,781.2 |  |  | $ | 8,411.1 |  |  | $ | 2.1 |  |  | $ | (6,670.6) |  |  | $ | 10,523.8 |
Liabilities: |  |  |  |  |  |  |  |  |
Accounts payable and other accrued liabilities - contingent liabilities | $ | — |  |  | $ | — |  |  | $ | 2.3 |  |  | $ | — |  |  | $ | 2.3 |
Payables to clients - Derivatives | 3,577.1 |  |  | 228.9 |  |  | — |  |  | (3,540.1) |  |  | 265.9 |
To be announced and forward settling securities | — |  |  | 24.4 |  |  | — |  |  | (22.9) |  |  | 1.5 |
Derivatives | 378.0 |  |  | 2,356.4 |  |  | — |  |  | (2,737.3) |  |  | (2.9) |
Payable to broker-dealers, clearing organizations and counterparties | 378.0 |  |  | 2,380.8 |  |  | — |  |  | (2,760.2) |  |  | (1.4) |
Equity securities | 219.8 |  |  | 5.0 |  |  | — |  |  | — |  |  | 224.8 |
Foreign government obligations | 41.0 |  |  | — |  |  | — |  |  | — |  |  | 41.0 |
Corporate and municipal bonds | — |  |  | 154.6 |  |  | — |  |  | — |  |  | 154.6 |
U.S. Treasury obligations | 2,139.3 |  |  | — |  |  | — |  |  | — |  |  | 2,139.3 |
U.S. government agency obligations | — |  |  | 0.2 |  |  | — |  |  | — |  |  | 0.2 |
Agency mortgage-backed obligations | — |  |  | 23.6 |  |  | — |  |  | — |  |  | 23.6 |
Asset-backed obligations | — |  |  | 3.9 |  |  | — |  |  | — |  |  | 3.9 |
Derivatives | 8.1 |  |  | 571.0 |  |  | — |  |  | (314.3) |  |  | 264.8 |
Cash flow hedges | — |  |  | 0.2 |  |  | — |  |  | — |  |  | 0.2 |
Other | — |  |  | — |  |  | 0.9 |  |  | — |  |  | 0.9 |
Financial instruments sold, not yet purchased | 2,408.2 |  |  | 758.5 |  |  | 0.9 |  |  | (314.3) |  |  | 2,853.3 |
Total liabilities at fair value | $ | 6,363.3 |  |  | $ | 3,368.2 |  |  | $ | 3.2 |  |  | $ | (6,614.6) |  |  | $ | 3,120.1 |
(1)Represents cash collateral and the impact of netting across at each level of the fair value hierarchy.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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