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Assets and Liabilities, at Fair Value (Tables)
 3 Months Ended
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 1Level 2Level 3Netting (1)Total
Assets:
Certificates of deposit $10.2 $— $— $— $10.2 
Money market mutual funds35.6 — — — 35.6 
Cash and cash equivalents45.8 — — — 45.8 
Commodities warehouse receipts9.1 — — — 9.1 
U.S. Treasury obligations299.9 — — — 299.9 
Securities and other assets segregated under federal and other regulations309.0 — — — 309.0 
U.S. Treasury obligations4,241.5 — — — 4,241.5 
To be announced and forward settling securities — 74.0 — (24.7)49.3 
Foreign government obligations16.7 — — — 16.7 
Derivatives3,706.9 2,789.7 — (6,022.8)473.8 
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net7,965.1 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 obligations623.7 — — — 623.7 
U.S. government agency obligations— 488.7 — — 488.7 
Foreign government obligations0.8 — — — 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 other22.2 — 2.1 — 24.3 
Financial instruments owned1,237.5 6,271.7 2.1 (593.2)6,918.1 
Physical commodities inventory201.0 275.7 — — 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 - Derivatives3,401.7 240.5 — (3,271.1)371.1 
To be announced and forward settling securities— 30.9 — (15.0)15.9 
Derivatives279.3 2,969.4 — (3,227.1)21.6 
Payable to broker-dealers, clearing organizations and counterparties279.3 3,000.3 — (3,242.1)37.5 
Equity securities 420.3 9.5 — — 429.8 
Foreign government obligations0.8 — — — 0.8 
Corporate and municipal bonds— 230.3 — — 230.3 
U.S. Treasury obligations2,583.2 — — — 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 
Derivatives3.3 798.8 — (513.2)288.9 
Cash flow hedges— 0.9 — — 0.9 
Other— — 0.8 — 0.8 
Financial instruments sold, not yet purchased3,007.6 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 1Level 2Level 3Netting (1)Total
Assets:
Certificates of deposit $13.9 $— $— $— $13.9 
Money market mutual funds35.3 — — — 35.3 
Cash and cash equivalents49.2 — — — 49.2 
Commodities warehouse receipts51.8 — — — 51.8 
Securities and other assets segregated under federal and other regulations51.8 — — — 51.8 
U.S. Treasury obligations2,933.2 — — — 2,933.2 
To be announced and forward settling securities— 26.1 — (18.3)7.8 
Foreign government obligations18.3 — — — 18.3 
Derivatives3,900.1 2,168.2 — (5,740.1)328.2 
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net6,851.6 2,194.3 — (5,758.4)3,287.5 
Receivables from clients, net - Derivatives22.4 506.2 — (537.0)(8.4)
Equity securities 363.9 15.0 — — 378.9 
Corporate and municipal bonds— 322.1 — — 322.1 
U.S. Treasury obligations1,088.6 — — — 1,088.6 
U.S. government agency obligations— 531.0 — — 531.0 
Foreign government obligations41.4 — — — 41.4 
Agency mortgage-backed obligations— 3,837.2 — — 3,837.2 
Asset-backed obligations— 223.5 — — 223.5 
Derivatives0.1 603.2 — (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 other23.6 — 2.1 — 25.7 
Financial instruments owned1,598.6 5,541.6 2.1 (375.2)6,767.1 
Physical commodities inventory207.6 169.0 — — 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 - Derivatives3,577.1 228.9 — (3,540.1)265.9 
To be announced and forward settling securities— 24.4 — (22.9)1.5 
Derivatives378.0 2,356.4 — (2,737.3)(2.9)
Payable to broker-dealers, clearing organizations and counterparties378.0 2,380.8 — (2,760.2)(1.4)
Equity securities 219.8 5.0 — — 224.8 
Foreign government obligations41.0 — — — 41.0 
Corporate and municipal bonds— 154.6 — — 154.6 
U.S. Treasury obligations2,139.3 — — — 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 
Derivatives8.1 571.0 — (314.3)264.8 
Cash flow hedges— 0.2 — — 0.2 
Other— — 0.9 — 0.9 
Financial instruments sold, not yet purchased2,408.2 758.5 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.