Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2025	Sep. 30, 2024
ASSETS
Cash and cash equivalents	$ 1,313.1	$ 1,269.0
Cash, securities and other assets segregated under federal and other regulations (including $13.4 million and $51.8 million at fair value at June 30, 2025 and September 30, 2024, respectively)	2,924.3	2,841.2
Collateralized transactions:
Securities purchased under agreements to resell	8,159.3	5,201.5
Securities borrowed	2,486.2	1,662.3
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net (including $3,250.6 million and $3,287.5 million at fair value at June 30, 2025 and September 30, 2024, respectively)	7,880.6	7,283.2
Receivable from clients, net (including $18.2 million and $(8.4) million at fair value at June 30, 2025 and September 30, 2024, respectively)	961.7	1,013.1
Income taxes receivable	49.1	19.3
Financial instruments owned, at fair value (includes securities pledged as collateral that can be sold or repledged of $2,223.7 million and $2,172.0 million at June 30, 2025 and September 30, 2024, respectively)	8,973.9	6,767.1
Physical commodities inventory, net (including $397.0 million and $376.6 million at fair value at June 30, 2025 and September 30, 2024, respectively)	705.4	681.1
Deferred tax asset, net	39.3	46.3
Property and equipment, net	148.7	143.1
Operating right of use assets	161.4	157.0
Goodwill and intangible assets, net	88.9	80.6
Other assets	373.7	301.5
Total assets	34,265.6	27,466.3
Liabilities:
Accounts payable and other accrued liabilities (including $2.6 million and $2.3 million at fair value at June 30, 2025 and September 30, 2024, respectively)	579.1	522.1
Operating lease liabilities	207.7	195.9
Payables to:
Clients (including $(103.5) million and $265.9 million at fair value at June 30, 2025 and September 30, 2024, respectively)	10,956.8	10,345.9
Broker-dealers, clearing organizations and counterparties (including $(134.2) million and $(1.4) million at fair value at June 30, 2025 and September 30, 2024, respectively)	503.0	734.2
Lenders under loans	352.7	338.8
Senior secured borrowings, net	543.9	543.1
Income taxes payable	15.4	18.1
Deferred tax liability	13.0	8.6
Collateralized transactions:
Securities sold under agreements to repurchase	13,375.4	8,581.3
Securities loaned	2,032.1	1,615.9
Financial instruments sold, not yet purchased, at fair value	3,707.7	2,853.3
Total liabilities	32,286.8	25,757.2
Commitments and contingencies (Note 11)
Stockholders' equity:
Preferred stock, $0.01 par value. Authorized 1,000,000 shares; no shares issued or outstanding	0.0	0.0
Common stock, $0.01 par value. Authorized 200,000,000 shares; 54,895,685 issued and 49,029,208 outstanding at June 30, 2025 and 53,678,016 issued and 47,811,539 outstanding at September 30, 2024	0.5	0.5
Common stock in treasury, at cost. 5,866,477 shares at June 30, 2025 and September 30, 2024	(69.3)	(69.3)
Additional paid-in-capital	452.7	414.2
Retained earnings	1,609.1	1,388.9
Accumulated other comprehensive loss, net	(14.2)	(25.2)
Total equity	1,978.8	1,709.1
Total liabilities and stockholders' equity	$ 34,265.6	$ 27,466.3