Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2024		Sep. 30, 2023
ASSETS
Cash and cash equivalents	$ 1,305.1		$ 1,108.3
Restricted cash	363.0	[1]	0.0
Cash, securities and other assets segregated under federal and other regulations (including $4.1 million and $5.8 million at fair value at March 31, 2024 and September 30, 2023, respectively)	2,838.4		2,426.3
Collateralized transactions:
Securities purchased under agreements to resell	3,744.6		2,979.5
Securities borrowed	1,430.6		1,129.1
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net (including $4,157.3 million and $4,248.3 million at fair value at March 31, 2024 and September 30, 2023, respectively)	7,706.5		7,443.8
Receivable from clients, net (including $(3.4) million and $(7.9) million at fair value at March 31, 2024 and September 30, 2023, respectively)	1,293.4		683.1
Notes receivable, net	0.0		5.2
Income taxes receivable	32.9		25.1
Financial instruments owned, at fair value (includes securities pledged as collateral that can be sold or repledged of $1,860.8 million and $1,466.4 million at March 31, 2024 and September 30, 2023, respectively)	5,666.5		5,044.8
Physical commodities inventory, net (including $355.2 million and $386.5 million at fair value at March 31, 2024 and September 30, 2023, respectively)	616.9		537.3
Deferred tax asset	42.3		45.4
Property and equipment, net	134.2		123.5
Operating right of use assets	146.4		122.1
Goodwill and intangible assets, net	79.5		82.4
Other assets	250.7		182.8
Total assets	25,651.0		21,938.7
Liabilities:
Accounts payable and other accrued liabilities (including $1.7 million and $1.5 million at fair value at March 31, 2024 and September 30, 2023, respectively)	491.8		533.0
Operating lease liabilities	181.9		149.3
Payables to:
Clients (including $585.6 million and $79.8 million at fair value at March 31, 2024 and September 30, 2023, respectively)	11,165.4		9,976.0
Broker-dealers, clearing organizations and counterparties (including $(21.3) million and $10.2 million at fair value at March 31, 2024 and September 30, 2023, respectively)	391.7		442.4
Lenders under loans	253.6		341.0
Senior secured borrowings, net	885.9		342.1
Income taxes payable	36.6		38.2
Deferred tax liability	8.2		8.1
Collateralized transactions:
Securities sold under agreements to repurchase	6,011.7		4,526.6
Securities loaned	1,458.6		1,117.3
Financial instruments sold, not yet purchased, at fair value	3,223.0		3,085.6
Total liabilities	24,108.4		20,559.6
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; 35,561,232 issued and 31,650,247 outstanding at March 31, 2024 and 35,105,852 issued and 31,194,867 outstanding at September 30, 2023	0.4		0.4
Common stock in treasury, at cost. 3,910,985 shares at March 31, 2024 and September 30, 2023	(69.3)		(69.3)
Additional paid-in-capital	390.8		371.7
Retained earnings	1,250.3		1,128.1
Accumulated other comprehensive loss, net	(29.6)		(51.8)
Total equity	1,542.6		1,379.1
Total liabilities and stockholders' equity	$ 25,651.0		$ 21,938.7

[1] Represents restricted cash held in an escrow account, as further described in Note 1 and Note 9.