StoneX (SNEX) 10-Q 2 Aug 23 2023 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Jun. 30, 2023	Aug. 01, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2023
Document Transition Report	false
Entity File Number	000-23554
Entity Registrant Name	StoneX Group Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	59-2921318
Entity Address, Address Line One	230 Park Ave
Entity Address, Address Line Two	10th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10169
City Area Code	(212)
Local Phone Number	485-3500
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	SNEX
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		20,794,764
Entity Central Index Key	0000913760
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
ASSETS
Cash and cash equivalents	$ 1,401.3	$ 1,108.5
Cash, securities and other assets segregated under federal and other regulations (including $4.8 million and $805.7 million at fair value at June 30, 2023 and September 30, 2022, respectively)	2,492.4	3,267.2
Collateralized transactions:
Securities purchased under agreements to resell	2,642	1,672
Securities borrowed	1,094.3	1,209.8
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net (including $3,641.6 million and $2,817.2 million at fair value at June 30, 2023 and September 30, 2022, respectively)	7,297.7	6,842.6
Receivable from clients, net (including $(0.1) million and $(0.5) million at fair value at June 30, 2023 and September 30, 2022, respectively)	698.9	566.2
Notes receivable, net	5.3	5.1
Income taxes receivable	24.9	16.8
Financial instruments owned, at fair value (includes securities pledged as collateral that can be sold or repledged of $1,417.7 million and $2,372.3 million at June 30, 2023 and September 30, 2022, respectively)	5,305.3	4,167.3
Physical commodities inventory, net (including $275.2 million and $359.8 million at fair value at June 30, 2023 and September 30, 2022, respectively)	444.7	513.5
Deferred income taxes, net	32.9	52
Property and equipment, net	118.2	112.9
Operating right of use assets	122.3	121.8
Goodwill and intangible assets, net	85.2	86.2
Other assets	167.7	117.7
Total assets	21,933.1	19,859.6
Liabilities:
Accounts payable and other accrued liabilities (including $1.4 million and $0 at fair value at June 30, 2023 and September 30, 2022, respectively)	476.1	400.6
Operating lease liabilities	150.9	143
Payables to:
Clients (including $(296.5) million and $(1,392.4) million at fair value at June 30, 2023 and September 30, 2022, respectively)	9,723.9	9,891
Broker-dealers, clearing organizations and counterparties (including $3.2 million and $55.8 million at fair value at June 30, 2023 and September 30, 2022, respectively)	633.6	659.8
Lenders under loans	422.6	485.1
Senior secured borrowings, net	341.3	339.1
Income taxes payable	35.8	16.2
Collateralized transactions:
Securities sold under agreements to repurchase	5,029.5	3,195.6
Securities loaned	1,093.3	1,189.5
Financial instruments sold, not yet purchased, at fair value	2,696.2	2,469.6
Total liabilities	20,603.2	18,789.5
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
Common stock, $0.01 par value. Authorized 30,000,000 shares; 23,356,948 issued and 20,749,625 outstanding at June 30, 2023 and 22,911,227 issued and 20,303,904 outstanding at September 30, 2022	0.2	0.2
Common stock in treasury, at cost. 2,607,323 shares at June 30, 2023 and September 30, 2022	(69.3)	(69.3)
Additional paid-in-capital	365.1	340.2
Retained earnings	1,077.4	889.6
Accumulated other comprehensive loss, net	(43.5)	(90.6)
Total equity	1,329.9	1,070.1
Total liabilities and stockholders' equity	$ 21,933.1	$ 19,859.6

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Jun. 30, 2023	Sep. 30, 2022
Statement of Financial Position [Abstract]
Cash, securities and other assets segregated under federal and other regulations at fair value	$ 4,800,000	$ 805,700,000
Deposits with and receivables from broker-dealers, clearing organizations and counterparties at fair value	3,641,600,000	2,817,200,000
Receivables from clients at fair value	(100,000)	(500,000)
Financial instruments owned, securities pledged as collateral that can be sold or repledged	1,417,700,000	2,372,300,000
Physical commodities inventory at fair value	275,200,000	359,800,000
Accounts payable and other accrued liabilities at fair value	1,400,000	0
Payables to client at fair value	(296,500,000)	(1,392,400,000)
Payables to broker-dealers, clearing organizations and counterparties at fair value	$ 3,200,000	$ 55,800,000
Preferred stock - par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock - authorized (in shares)	1,000,000	1,000,000
Preferred stock - issued (in shares)	0	0
Preferred stock - outstanding (in shares)	0	0
Common stock - par value (in dollar per share)	$ 0.01	$ 0.01
Common stock - authorized (in shares)	30,000,000	30,000,000
Common stock - issued (in shares)	23,356,948	22,911,227
Common stock - outstanding (in shares)	20,749,625	20,303,904
Treasury stock - shares (in shares)	2,607,323	2,607,323

Condensed Consolidated Income S

Condensed Consolidated Income Statements - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues:
Revenues	$ 15,047.9	$ 18,930.9	$ 44,220.5	$ 49,655
Cost of sales of physical commodities	14,271	18,402.1	42,084.4	48,131
Operating revenues	776.9	528.8	2,136.1	1,524
Transaction-based clearing expenses	66.7	74.7	203.2	222.1
Introducing broker commissions	43.4	41.2	122.4	122.7
Interest expense	216	28.1	549	57.9
Interest expense on corporate funding	14.9	10.7	44.2	33.1
Net operating revenues	435.9	374.1	1,217.3	1,088.2
Compensation and other expenses:
Compensation and benefits	226.6	202.2	658.1	584.3
Trading systems and market information	19.4	16	54.9	49
Professional fees	13.9	13.2	41.1	38.9
Non-trading technology and support	13.7	12.9	44.7	38.7
Occupancy and equipment rental	10	9.2	29.5	26.7
Selling and marketing	13.7	16	40.8	41.3
Travel and business development	6.2	4.9	17.7	10.8
Communications	2.4	2	6.7	6
Depreciation and amortization	13.8	11.7	39.6	32.1
Bad debts, net of recoveries	6.3	(0.7)	10	11.4
Other	15.4	15.8	50.1	44.6
Total compensation and other expenses	341.4	303.2	993.2	883.8
Gain on acquisition and other gain	0	0	23.5	6.4
Income before tax	94.5	70.9	247.6	210.8
Income tax expense	25	21.8	59.8	56
Net income	$ 69.5	$ 49.1	$ 187.8	$ 154.8
Earnings per share:
Basic (in dollar per shares)	$ 3.35	$ 2.42	$ 9.12	$ 7.69
Diluted (in dollar per shares)	$ 3.25	$ 2.37	$ 8.82	$ 7.52
Weighted-average number of common shares outstanding:
Basic (in shares)	20,040,167	19,634,450	19,913,424	19,529,843
Diluted (in shares)	20,654,300	20,109,992	20,578,315	19,984,898
Sales of physical commodities
Revenues:
Revenues	$ 14,319.2	$ 18,431	$ 42,228.8	$ 48,214.1
Principal gains, net
Revenues:
Revenues	300	295.2	810.8	869.8
Commission and clearing fees
Revenues:
Revenues	126.8	126.9	375.5	381.6
Consulting, management, and account fees
Revenues:
Revenues	39.2	27.7	119.7	77.2
Interest income
Revenues:
Revenues	$ 262.7	$ 50.1	$ 685.7	$ 112.3

Condensed Consolidated Statemen

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 69.5	$ 49.1	$ 187.8	$ 154.8
Other comprehensive gain/(loss), net of tax:
Foreign currency translation adjustment	4.1	(5.4)	15.5	(5.5)
Cash flow hedges	2.6	(6.8)	31.6	(25)
Total other comprehensive gain/(loss), net of tax	6.7	(12.2)	47.1	(30.5)
Comprehensive income	$ 76.2	$ 36.9	$ 234.9	$ 124.3

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions		9 Months Ended
		Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income		$ 187.8	$ 154.8
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization		39.6	32.1
Amortization of right of use assets		7.9	12.1
Bad debts, net of recoveries		10	11.4
Deferred income taxes		3.2	0.4
Amortization of debt issuance costs		4.3	3.5
Amortization of share-based compensation		21.3	12.8
Gain on acquisition		(23.5)	0
Changes in operating assets and liabilities, net:
Securities and other assets segregated under federal and other regulations		600.6	(7.3)
Securities purchased under agreements to resell		(970)	523.7
Securities borrowed		115.5	1,054.4
Deposits with and receivables from broker-dealers, clearing organizations, and counterparties, net		(1,072.7)	(2,931.3)
Receivables from clients, net		(89.8)	(176.7)
Notes receivable, net		(0.2)	1.1
Income taxes receivable		(5.3)	17.4
Financial instruments owned, at fair value		(1,112.6)	621.1
Physical commodities inventory, net		91.3	(117.9)
Other assets		(44.5)	(12.4)
Accounts payable and other accrued liabilities		23.5	36.4
Operating lease liabilities		(0.5)	(13.3)
Payables to clients		(170.7)	2,311
Payables to broker-dealers, clearing organizations, and counterparties		(26.6)	(182.8)
Income taxes payable		18.8	11.8
Securities sold under agreements to repurchase		1,833.9	(1,533.2)
Securities loaned		(96.2)	(1,058.1)
Financial instruments sold, not yet purchased, at fair value		260.1	733
Net cash used in operating activities		(394.8)	(496)
Cash flows from investing activities:
Acquisition of businesses and assets, net of cash received		(6.1)	(0.2)
Sale of exchange memberships and common stock		0	0.2
Purchases of property and equipment		(32.8)	(37.6)
Net cash used in investing activities		(38.9)	(37.6)
Cash flows from financing activities:
Net change in payables to lenders under loans with maturities 90 days or less		(37.7)	269.6
Proceeds from payables to lenders under loans with maturities greater than 90 days		170	452
Repayments of payables to lenders under loans with maturities greater than 90 days		(205)	(462)
Repayments of senior secured term loan		0	(170.3)
Deferred payments on acquisitions		(18.5)	(1.5)
Payment of contingent consideration		0	(2.8)
Exercise of stock options		3.6	6.2
Net cash (used in)/provided by financing activities		(87.6)	91.2
Effect of exchange rates on cash, segregated cash, cash equivalents, and segregated cash equivalents		14.8	(5.5)
Net decrease in cash, segregated cash, cash equivalents, and segregated cash equivalents		(506.5)	(447.9)
Cash, segregated cash, cash equivalents, and segregated cash equivalents at beginning of period		6,285.1	6,509.5
Cash, segregated cash, cash equivalents, and segregated cash equivalents at end of period		5,778.6	6,061.6
Supplemental disclosure of cash flow information:
Cash paid for interest		550.8	85.4
Income taxes paid, net of cash refunds		41.9	25.4
Supplemental disclosure of non-cash investing and financing activities:
Identified intangible assets and goodwill on acquisitions		10.6	0
Additional consideration payable related to acquisitions, net		28.7	0
Acquisition of business:
Assets acquired		141.6	0
Liabilities assumed		84.1	0
Total net assets acquired		57.5	0
Cash and cash equivalents		1,401.3	1,363.7
Cash segregated under federal and other regulations	[1]	2,487.5	2,522.3
Securities segregated under federal and other regulations	[1]	0.1	0.1
Cash segregated and deposited with or pledged to exchange-clearing organizations and other futures commission merchants (“FCMs”)	[2]	1,499.2	1,910
Securities segregated and pledged to exchange-clearing organizations	[2]	390.5	265.5
Total cash, segregated cash, cash equivalents, and segregated cash equivalents shown in the condensed consolidated statements of cash flows		5,778.6	6,061.6
Non-cash equivalent segregated assets		4.8	21.4
Non-segregated cash and other non-cash equivalent assets included within deposits and receivables from broker-dealers, clearing organizations, and counterparties		$ 5,408	$ 5,084.6
[1]Represents segregated client cash held at third-party banks. Excludes segregated commodity warehouse receipts, segregated U.S. Treasury obligations with original or acquired maturities of greater than 90 days, and other assets of $4.8 million and $21.4 million as of June 30, 2023 and 2022, respectively, included within Cash, securities and other assets segregated under federal and other regulations on the Condensed Consolidated Balance Sheets. Represents segregated client cash and U.S. Treasury obligations on deposit with, or pledged to, exchange clearing organizations and other FCMs. Excludes non-segregated cash, segregated U.S. Treasury obligations pledged to exchange-clearing organizations with original or acquired maturities greater than 90 days, and other assets of $5,408.0 million and $5,084.6 million as of June 30, 2023 and 2022, respectively, included within Deposits with and receivables from broker-dealers, clearing organizations, and counterparties, net on the Condensed Consolidated Balance Sheets.

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss, net
Beginning balance at Sep. 30, 2021	$ 904	$ 0.2	$ (69.3)	$ 315.7	$ 682.5	$ (25.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	154.8				154.8
Other comprehensive gain (loss), net of tax	(30.5)					(30.5)
Exercise of stock options	6.2			6.2
Share-based compensation	12.8			12.8
Ending balance at Jun. 30, 2022	1,047.3	0.2	(69.3)	334.7	837.3	(55.6)
Beginning balance at Mar. 31, 2022	1,005.6	0.2	(69.3)	329.9	788.2	(43.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	49.1				49.1
Other comprehensive gain (loss), net of tax	(12.2)					(12.2)
Exercise of stock options	0.3			0.3
Share-based compensation	4.5			4.5
Ending balance at Jun. 30, 2022	1,047.3	0.2	(69.3)	334.7	837.3	(55.6)
Beginning balance at Sep. 30, 2022	1,070.1	0.2	(69.3)	340.2	889.6	(90.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	187.8				187.8
Other comprehensive gain (loss), net of tax	47.1					47.1
Exercise of stock options	3.6			3.6
Share-based compensation	21.3			21.3
Ending balance at Jun. 30, 2023	1,329.9	0.2	(69.3)	365.1	1,077.4	(43.5)
Beginning balance at Mar. 31, 2023	1,247.3	0.2	(69.3)	358.7	1,007.9	(50.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	69.5				69.5
Other comprehensive gain (loss), net of tax	6.7					6.7
Exercise of stock options	0			0
Share-based compensation	6.4			6.4
Ending balance at Jun. 30, 2023	$ 1,329.9	$ 0.2	$ (69.3)	$ 365.1	$ 1,077.4	$ (43.5)

Basis of Presentation and Conso

Basis of Presentation and Consolidation and Accounting Standards Adopted	9 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Consolidation and Accounting Standards Adopted	Basis of Presentation and Consolidation and Accounting Standards Adopted StoneX Group Inc., a Delaware corporation, and its consolidated subsidiaries (collectively “StoneX” or “the Company”), is a global financial services network that connects companies, organizations, traders and investors to the global market ecosystem through a unique blend of digital platforms, end-to-end clearing and execution services, high touch service, and deep expertise. The Company strives to be the one trusted partner to its clients, providing its network, products and services to allow them to pursue trading opportunities, manage their market risks, make investments and improve their business performance. The Company offers a vertically integrated product suite, beginning with high-touch and electronic access to nearly all major financial markets worldwide, as well as numerous liquidity venues. The Company delivers access and services through the entire lifecycle of a trade, by delivering deep market expertise and on-the-ground intelligence, best execution, and finally post-trade clearing, custody, as well as settlement services. The Company has created revenue streams, diversified by asset class, client type and geography, that earn commissions and spreads as clients execute transactions across its financial network, while monetizing non-trading client activity including interest and fee earnings on client balances as well as earning consulting fees for market intelligence and risk management services. The Company provides its services to a diverse group of clients in more than 180 countries. These clients include more than 54,000 commercial, institutional, and global payments clients and over 400,000 retail clients. The Company’s clients include commercial entities, asset managers, regional, national and introducing broker-dealers, insurance companies, brokers, institutional investors and professional traders, commercial and investment banks and government and non-governmental organizations (“NGOs”). The Company’s common stock trades on The NASDAQ Global Select Market under the symbol “SNEX”. Basis of Presentation and Consolidation The accompanying unaudited Condensed Consolidated Balance Sheet as of September 30, 2022, which has been derived from the audited consolidated balance sheet of September 30, 2022, and the unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and disclosures normally included in annual consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted pursuant to those rules and regulations. The Company believes that the included disclosures clearly and fairly present the information within. In management’s opinion, all adjustments, generally consisting of normal accruals, considered necessary to fairly present the condensed consolidated financial statements for the interim periods presented have been reflected as required by Rule 10-01 of Regulation S-X. Operating results for interim periods are not necessarily indicative of the results that may be expected for the related full year. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related notes contained in the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2022, as filed with the SEC. These condensed consolidated financial statements include the accounts of StoneX Group Inc. and all entities in which the Company has a controlling financial interest. All material intercompany transactions and balances have been eliminated in consolidation. The Company’s fiscal year end is September 30, and its fiscal quarters end on December 31, March 31, June 30 and September 30. Unless otherwise stated, all dates refer to fiscal years and fiscal interim periods. Preparing condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities as of the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. The most significant of these estimates and assumptions relate to fair value measurement for financial instruments, revenue recognition, valuation of inventories, and income taxes. These estimates are based on management’s best knowledge of current events and actions the Company may undertake in the future. The Company reviews all significant estimates affecting the financial statements on a recurring basis and records the effect of any necessary adjustments prior to financial statement issuance. Although these and other estimates and assumptions are based on the best available information, actual results could be materially different from these estimates. Estimates and assumptions were considered and made in context with the information reasonably available to the Company as of June 30, 2023 and through the date of this Form 10-Q. In the Condensed Consolidated Income Statements, the total revenues reported combine gross revenues for the physical commodities business and net revenues for all other businesses. The subtotal Operating revenues in the Condensed Consolidated Income Statements is calculated by deducting Cost of sales of physical commodities from Total revenues . The subtotal Net operating revenues in the Condensed Consolidated Income Statements is calculated as Operating revenues less Transaction-based clearing expenses , Introducing broker commissions , Interest expense, and Interest expense on corporate funding . Transaction-based clearing expenses represent variable expenses paid to executing brokers, exchanges, clearing organizations and banks in relation to transactional volumes. Introducing broker commissions include commission paid to certain non-employee third parties that have introduced clients to the Company. Net operating revenues represent revenues available to pay variable compensation to risk management consultants and traders, direct non-variable expenses, as well as variable and non-variable expenses to operational and administrative employees. Gain on acquisition and other gain Gain on acquisition contains the value that the Company acquired in excess of consideration paid for business combinations. More details can be found in Note 17. Accounting Standards

Earnings per Share

Earnings per Share	9 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Earnings per Share	Earnings per Share The Company presents basic and diluted earnings per share (“EPS”) using the two-class method, which requires all outstanding unvested share-based payment awards that contain rights to non-forfeitable dividends and therefore participate in undistributed earnings with common stockholders be included in computing earnings per share. Under the two-class method, net income is reduced by the amount of dividends declared in the period for each class of common stock and participating security. The remaining undistributed earnings are then allocated to common stock and participating securities, based on their respective rights to receive dividends. Restricted stock awards granted to certain employees and directors contain non-forfeitable rights to dividends at the same rate as common stock and are considered participating securities. Basic EPS has been computed by dividing net income by the weighted-average number of common shares outstanding. The following is a reconciliation of the numerator and denominator of the diluted earnings per share computations for the periods presented below. Three Months Ended June 30, Nine Months Ended June 30, (in millions, except share amounts) 2023 2022 2023 2022 Numerator: Net income $ 69.5 $ 49.1 $ 187.8 $ 154.8 Less: Allocation to participating securities (2.4) (1.5) (6.3) (4.5) Net income allocated to common stockholders $ 67.1 $ 47.6 $ 181.5 $ 150.3 Denominator: Weighted average number of: Common shares outstanding 20,040,167 19,634,450 19,913,424 19,529,843 Dilutive potential common shares outstanding: Share-based awards 614,133 475,542 664,891 455,055 Diluted weighted-average common shares 20,654,300 20,109,992 20,578,315 19,984,898 The dilutive effect of share-based awards is reflected in diluted net income per share by applying the treasury stock method, which includes consideration of unamortized share-based compensation expense. Options to purchase 288,745 and 443,275 shares of common stock for the three months ended June 30, 2023 and 2022, respectively, were excluded from the calculation of diluted earnings per share as they would have been anti-dilutive. Options to purchase 249,877 and 463,991 shares of common stock for the nine months ended June 30, 2023 and 2022, respectively, were excluded from the calculation of diluted earnings per share as they would have been anti-dilutive.

Assets and Liabilities, at Fair

Assets and Liabilities, at Fair Value	9 Months Ended
	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Assets and Liabilities, at Fair Value	Assets and Liabilities, at Fair Value Fair value is defined by U.S. GAAP as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between willing market participants on the measurement date. Fair value is a market-based measure considered from the perspective of a market participant rather than an entity-specific measure. Even when market assumptions are not readily available, the Company is required to develop a set of assumptions that reflect those that market participants would use in pricing an asset or liability at the measurement date. The Company uses prices and inputs that are current as of measurement date, including periods of market dislocation. In periods of market dislocation, the observability of prices and inputs may be reduced for many securities. This condition could cause a security to be reclassified to a lower level within the fair value hierarchy. The Company has designed independent price verification controls and periodically performs such controls to ensure the reasonableness of such values. Financial and nonfinancial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). A market is active if there are sufficient transactions on an ongoing basis to provide current pricing information for the asset or liability, pricing information is released publicly, and price quotations do not vary substantially either over time or among market participants. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the reporting entity. Relevant guidance requires the Company to consider counterparty credit risk of all parties to outstanding derivative instruments that would be considered by a market participant in the transfer or settlement of such contracts (exit price). The Company’s exposure to credit risk on derivative financial instruments principally relates to the portfolio of Over-the-counter (“OTC”) derivative contracts as all exchange-traded contracts held can be settled on an active market with a credit guarantee from the respective exchange. The Company requires each counterparty to deposit margin collateral for all OTC instruments and is also required to deposit margin collateral with counterparties. The Company has assessed the nature of these deposits and used its discretion to adjust each based on the underlying credit considerations for the counterparty and determined that the collateral deposits minimize the exposure to counterparty credit risk in the evaluation of the fair value of OTC instruments as determined by a market participant. In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 820, Fair Value Measurement, the Company groups its assets and liabilities measured at fair value in three levels based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are: Level 1 - Valuation is based upon unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities. Level 1 consists of financial assets and liabilities whose fair values are estimated using quoted market prices. Level 2 - Valuation is based upon quoted prices for identical or similar assets or liabilities in markets that are less active, that is, markets in which there are few transactions for the asset or liability that are observable for substantially the full term. Included in Level 2 are those financial assets and liabilities for which fair values are estimated using models or other valuation methodologies. These models are primarily industry-standard models that consider various observable inputs, including time value, yield curve, volatility factors, observable current market and contractual prices for the underlying financial instruments, as well as other relevant economic measures. Level 3 - Valuation is based on prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported by little or no market activity). Level 3 comprises financial assets and liabilities whose fair value is estimated based on internally developed models or methodologies utilizing significant inputs that are not readily observable from objective sources. Level 3 includes contingent liabilities that have been valued using an income approach based upon management developed discounted cash flow projections, which are an unobservable input. The Company had no contingent liabilities as of June 30, 2023 and September 30, 2022, respectively. The Company had certain options related to business combinations and certain deferred acquisition consideration classified as Level 3 assets as of June 30, 2023 and no Level 3 assets as of September 30, 2022. Fair value of financial and nonfinancial assets and liabilities that are carried on the Condensed Consolidated Balance Sheets at fair value on a recurring basis Cash and cash equivalents reported at fair value on a recurring basis includes certificates of deposit and money market mutual funds, which are stated at cost plus accrued interest, which approximates fair value. Cash, securities and other assets segregated under federal and other regulations reported at fair value on a recurring basis include the value of pledged investments, primarily U.S. Treasury obligations and commodities warehouse receipts. Deposits with and receivables from broker-dealers, clearing organizations and counterparties and payable to clients and broker-dealers, clearing organizations and counterparties includes the fair value of pledged investments, primarily U.S. Treasury obligations and foreign government obligations. These balances also include the fair value of exchange-traded options on futures and OTC forwards, swaps and options. Financial instruments owned and sold, not yet purchased include the fair value of equity securities, which includes common, preferred, and foreign ordinary shares, American Depository Receipts (“ADRs”), Global Depository Receipts (“GDRs”), and exchange-traded funds (“ETFs”), corporate and municipal bonds, U.S. Treasury obligations, U.S. government agency obligations, foreign government obligations, agency mortgage-backed obligations, asset-backed obligations, derivative financial instruments, commodities warehouse receipts, exchange firm common stock, and investments in managed funds. The fair value of exchange firm common stock is determined by quoted market prices. Cash equivalents, debt and equity securities, commodities warehouse receipts, physical commodities inventory, derivative financial instruments and contingent liabilities are carried at fair value, on a recurring basis, and are classified and disclosed into three levels in the fair value hierarchy. The following section describes the valuation methodologies used by the Company to measure classes of financial instruments at fair value and specifies the level within the fair value hierarchy where various financial instruments are classified. The Company uses quoted prices in active markets, where available, and classifies instruments with such quotes within Level 1 of the fair value hierarchy. Examples include U.S. Treasury obligations, foreign government obligations, commodities warehouse receipts, certain equity securities traded in active markets, physical precious metals inventory held by a regulated broker-dealer subsidiary, exchange firm common stock, investments in managed funds, as well as options on futures contracts traded on national exchanges. The fair value of exchange firm common stock is determined by recent sale transactions and is included within Level 1. When instruments are traded in secondary markets and observable prices are not available for substantially the full term, the Company generally relies on internal valuation techniques based upon observable inputs for comparable financial instruments, or prices obtained from third-party pricing services or brokers or a combination thereof, and accordingly, classified these instruments as Level 2. Examples include corporate and municipal bonds, U.S. government agency obligations, agency-mortgage backed obligations, asset-backed obligations, certain equity securities traded in less active markets, and OTC derivative contracts, which include purchase and sale commitments related to the Company’s foreign exchange, agricultural, and energy commodities. Certain derivatives without a quoted price in an active market and derivatives executed OTC are valued using internal valuation techniques, including pricing models which utilize significant inputs observable to market participants. The valuation techniques and inputs depend on the type of derivative and the nature of the underlying instrument. The key inputs depend upon the type of derivative and the nature of the underlying instrument and include interest yield curves, foreign exchange rates, commodity prices, volatilities and correlation. These derivative instruments are included within Level 2 of the fair value hierarchy. Physical commodities inventory includes precious metals that are a part of the trading activities of a regulated broker-dealer subsidiary and is recorded at fair value using exchange-quoted prices. Physical commodities inventory also includes agricultural commodities that are a part of the trading activities of a non-broker dealer subsidiary and are recorded at net realizable value using exchange-quoted prices. The fair value of precious metals physical commodities inventory is based upon unadjusted exchange-quoted prices and is, therefore, classified within Level 1 of the fair value hierarchy. The fair value of agricultural physical commodities inventory and the related OTC firm sale and purchase commitments are generally based upon exchange-quoted prices, adjusted for basis or differences in local markets, broker or dealer quotations or market transactions in either listed or OTC markets. Exchange-quoted prices are adjusted for location and quality because the exchange-quoted prices for agricultural and energy related products represent contracts that have standardized terms for commodity, quantity, future delivery period, delivery location, and commodity quality or grade. The basis or local market adjustments are observable inputs or have an insignificant impact on the measurement of fair value and, therefore, the agricultural physical commodities inventory, as well as the related OTC forward firm sale and purchase commitments have been included within Level 2 of the fair value hierarchy. With the exception of certain derivative instruments where the valuation approach is disclosed above, financial instruments owned and sold are primarily valued using third-party pricing sources. Third-party pricing vendors compile prices from various sources and often apply matrix pricing for similar securities when market-observable transactions for the instruments are not observable for substantially the full term. The Company reviews the pricing methodologies used by third-party pricing vendors in order to evaluate the fair value hierarchy classification of vendor-priced financial instruments and the accuracy of vendor pricing, which typically involves comparing of primary vendor prices to internal trader prices or secondary vendor prices. When evaluating the propriety of vendor-priced financial instruments using secondary prices, considerations include the range and quality of vendor prices, level of observable transactions for identical and similar instruments, and judgments based upon knowledge of a particular market and asset class. If the primary vendor price does not represent fair value, justification for using a secondary price, including source data used to make the determination, is subject to review and approval by authorized personnel prior to using a secondary price. Financial instruments owned and sold that are valued using third party pricing sources are included within either Level 1 or Level 2 of the fair value hierarchy based upon the observability of the inputs used and the level of activity in the market. 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 June 30, 2023 and September 30, 2022 by level in the fair value hierarchy. All fair value measurements were performed on a recurring basis as of June 30, 2023 and September 30, 2022. June 30, 2023 (in millions) Level 1 Level 2 Level 3 Netting (1) Total Assets: Certificates of deposit $ 12.9 $ — $ — $ — $ 12.9 Money market mutual funds 66.7 — — — 66.7 Cash and cash equivalents 79.6 — — — 79.6 Commodities warehouse receipts 4.7 — — — 4.7 U.S. Treasury obligations 0.1 — — — 0.1 Securities and other assets segregated under federal and other regulations 4.8 — — — 4.8 U.S. Treasury obligations 3,774.5 — — — 3,774.5 To be announced and forward settling securities — 35.3 — (17.9) 17.4 Foreign government obligations 18.2 — — — 18.2 Derivatives 5,425.8 1,469.5 — (7,063.8) (168.5) Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net 9,218.5 1,504.8 — (7,081.7) 3,641.6 Receivables from clients, net - Derivatives 62.2 653.6 — (715.9) (0.1) Equity securities 375.0 11.2 — — 386.2 Corporate and municipal bonds — 233.9 — — 233.9 U.S. Treasury obligations 542.9 — — — 542.9 U.S. government agency obligations — 522.7 — — 522.7 Foreign government obligations 26.8 — — — 26.8 Agency mortgage-backed obligations — 3,043.6 — — 3,043.6 Asset-backed obligations — 144.2 — — 144.2 Derivatives 0.6 1,018.6 — (721.8) 297.4 Commodities leases — 21.2 — — 21.2 Commodities warehouse receipts 36.9 — — — 36.9 Exchange firm common stock 11.1 — — — 11.1 Cash flow hedges — 7.5 — — 7.5 Mutual funds and other 30.3 — 0.6 — 30.9 Financial instruments owned 1,023.6 5,002.9 0.6 (721.8) 5,305.3 Physical commodities inventory 117.3 157.9 — — 275.2 Total assets at fair value $ 10,506.0 $ 7,319.2 $ 0.6 $ (8,519.4) $ 9,306.4 Liabilities: Accounts payable and other accrued liabilities $ — $ — $ 1.4 $ — $ 1.4 Payables to clients - Derivatives 5,359.4 276.8 — (5,932.7) (296.5) TBA and forward settling securities — 24.0 — (17.7) 6.3 Derivatives 115.9 1,725.7 — (1,844.7) (3.1) Payable to broker-dealers, clearing organizations and counterparties 115.9 1,749.7 — (1,862.4) 3.2 Equity securities 297.0 4.8 — — 301.8 Foreign government obligations 20.7 — — — 20.7 Corporate and municipal bonds — 120.8 — — 120.8 U.S. Treasury obligations 1,805.1 — — — 1,805.1 U.S. government agency obligations — 29.2 — — 29.2 Agency mortgage-backed obligations — 6.2 — — 6.2 Derivatives 4.8 943.6 — (579.4) 369.0 Cash flow hedges — 37.6 — — 37.6 Other — 4.5 1.3 — 5.8 Financial instruments sold, not yet purchased 2,127.6 1,146.7 1.3 (579.4) 2,696.2 Total liabilities at fair value $ 7,602.9 $ 3,173.2 $ 2.7 $ (8,374.5) $ 2,404.3 (1) Represents cash collateral and the impact of netting across at each level of the fair value hierarchy. September 30, 2022 (in millions) Level 1 Level 2 Level 3 Netting (1) Total Assets: Certificates of deposit $ 4.0 $ — $ — $ — $ 4.0 Money market mutual funds 39.5 — — — 39.5 Cash and cash equivalents 43.5 — — — 43.5 Commodities warehouse receipts 19.7 — — — 19.7 U.S. Treasury obligations 786.0 — — — 786.0 Securities and other assets segregated under federal and other regulations 805.7 — — — 805.7 U.S. Treasury obligations 4,258.5 — — — 4,258.5 TBA and forward settling securities — 207.6 — (91.4) 116.2 Foreign government obligations 14.4 — — — 14.4 Derivatives 7,714.4 461.4 — (9,747.7) (1,571.9) Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net 11,987.3 669.0 — (9,839.1) 2,817.2 Receivables from clients, net - Derivatives 67.2 511.6 (579.3) (0.5) Equity securities 367.9 11.8 — — 379.7 Corporate and municipal bonds — 156.8 — — 156.8 U.S. Treasury obligations 347.6 — — — 347.6 U.S. government agency obligations — 343.0 — — 343.0 Foreign government obligations 4.8 — — — 4.8 Agency mortgage-backed obligations — 2,588.7 — — 2,588.7 Asset-backed obligations — 70.7 — — 70.7 Derivatives 0.7 694.3 — (502.4) 192.6 Commodities leases — 26.4 — — 26.4 Commodities warehouse receipts 24.9 — — — 24.9 Exchange firm common stock 10.6 — — — 10.6 Mutual funds and other 17.4 4.1 — — 21.5 Financial instruments owned 773.9 3,895.8 — (502.4) 4,167.3 Physical commodities inventory 136.3 223.5 — — 359.8 Total assets at fair value $ 13,813.9 $ 5,299.9 $ — $ (10,920.8) $ 8,193.0 Liabilities: Payables to clients - Derivatives 7,722.5 175.4 (9,290.3) (1,392.4) TBA and forward settling securities — 154.9 — (96.9) 58.0 Derivatives 58.7 590.6 — (651.5) (2.2) Payable to broker-dealers, clearing organizations and counterparties 58.7 745.5 — (748.4) 55.8 Equity securities 299.9 5.7 — — 305.6 Foreign government obligations 0.5 — — — 0.5 Corporate and municipal bonds — 63.2 — — 63.2 U.S. Treasury obligations 1,686.5 — — — 1,686.5 U.S. government agency obligations — 24.3 — — 24.3 Agency mortgage-backed obligations — 5.4 — — 5.4 Derivatives — 779.7 — (466.3) 313.4 Cash flow hedges — 70.6 — — 70.6 Other — 0.1 — — 0.1 Financial instruments sold, not yet purchased 1,986.9 949.0 — (466.3) 2,469.6 Total liabilities at fair value $ 9,768.1 $ 1,869.9 $ — $ (10,505.0) $ 1,133.0 (1) Represents cash collateral and the impact of netting across at each level of the fair value hierarchy. Realized and unrealized gains and losses are included in Principal gains, net , Interest income , and Cost of sales of physical commodities in the Condensed Consolidated Income Statements. Additional disclosures about the fair value of financial instruments that are not carried on the Condensed Consolidated Balance Sheets at fair value Many, but not all, of the financial instruments that the Company holds are recorded at fair value in the Condensed Consolidated Balance Sheets. The following represents financial instruments in which the ending balance at June 30, 2023 and September 30, 2022 was not carried at fair value in accordance with U.S. GAAP on the Condensed Consolidated Balance Sheets: Short-term financial instruments : The carrying value of short-term financial instruments, including cash and cash equivalents, cash segregated under federal and other regulations, securities purchased under agreements to resell and securities sold under agreements to repurchase, and securities borrowed and loaned are recorded at amounts that approximate the fair value of these instruments due to their short-term nature and level of collateralization. These financial instruments generally expose the Company to limited credit risk and have no stated maturities or have short-term maturities and carry interest rates that approximate market rates. Under the fair value hierarchy, cash and cash equivalents and cash segregated under federal and other regulations are classified as Level 1. Securities purchased under agreements to resell and securities sold under agreements to repurchase, and securities borrowed and loaned are classified as Level 2 under the fair value hierarchy as they are generally overnight or short-term in nature and are collateralized by equity securities, U.S. Treasury obligations, U.S. government agency obligations, agency mortgage-backed obligations, and asset-backed obligations. Receivables and other assets : Receivables from broker-dealers, clearing organizations, and counterparties, receivables from clients, net, notes receivables, and certain other assets are recorded at amounts that approximate fair value due to their short-term nature and are classified as Level 2 under the fair value hierarchy. Payables : Payables to clients and payables to broker-dealers, clearing organizations, and counterparties are recorded at amounts that approximate fair value due to their short-term nature and are classified as Level 2 under the fair value hierarchy. Lenders under loans : Payables to lenders under loans carry variable rates of interest and thus approximate fair value and are classified as Level 2 under the fair value hierarchy.

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk	9 Months Ended
	Jun. 30, 2023
Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk [Abstract]
Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk	Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk The Company is party to certain financial instruments with off-balance sheet risk in the normal course of its business. The Company has sold financial instruments that it does not currently own and will therefore be obliged to purchase such financial instruments at a future date. The Company has recorded these obligations in the condensed consolidated financial statements as of June 30, 2023 and September 30, 2022 at the fair values of the related financial instruments. The Company will incur losses if the fair value of the underlying financial instruments increases subsequent to June 30, 2023. The total financial instruments sold, not yet purchased of $2,696.2 million and $2,469.6 million as of June 30, 2023 and September 30, 2022, respectively, includes $369.0 million and $313.4 million for derivative contracts not designated as hedges, respectively, which represented a liability to the Company based on their fair values as of June 30, 2023 and September 30, 2022. Derivatives The Company utilizes derivative products in its trading capacity as a dealer in order to satisfy client needs and mitigate risk. The Company manages risks from both derivatives and non-derivative cash instruments on a consolidated basis. The risks of derivatives should not be viewed in isolation, but in aggregate with the Company’s other trading activities. The Company’s derivative positions are included in the Condensed Consolidated Balance Sheets in Deposits with and receivables from broker-dealers, clearing organizations and counterparties , Receivables from clients, net , Financial instruments owned and sold, not yet purchased, at fair value , Payable to clients and Payables to broker-dealers, clearing organizations and counterparties . Listed below are the fair values of the Company’s derivative assets and liabilities as of June 30, 2023 and September 30, 2022. Assets represent net unrealized gains and liabilities represent net unrealized losses. June 30, 2023 September 30, 2022 (in millions) Assets (1) Liabilities (1) Assets (1) Liabilities (1) Derivative contracts not accounted for as hedges: Exchange-traded commodity derivatives $ 1,644.0 $ 1,630.6 $ 4,520.4 $ 4,519.3 OTC commodity derivatives 1,865.3 1,790.4 756.9 695.6 Exchange-traded foreign exchange derivatives 2.4 2.4 25.6 25.7 OTC foreign exchange derivatives 756.3 726.5 577.1 549.3 Exchange-traded interest rate derivatives 1,835.3 1,840.2 2,626.8 2,626.7 OTC interest rate derivatives 343.4 343.4 168.9 205.1 Exchange-traded equity index derivatives 2,006.9 2,006.9 609.5 609.5 OTC equity and indices derivatives 176.7 85.8 164.4 95.7 TBA and forward settling securities 35.3 24.0 207.6 154.9 Subtotal 8,665.6 8,450.2 9,657.2 9,481.8 Derivative contracts designated as hedging instruments: Interest rate contracts — 37.6 — 48.8 Foreign currency forward contracts 7.5 — — 21.8 Subtotal 7.5 37.6 — 70.6 Gross fair value of derivative contracts $ 8,673.1 $ 8,487.8 $ 9,657.2 $ 9,552.4 Impact of netting and collateral (8,519.4) (8,374.5) (10,920.8) (10,505.0) Total fair value included in Deposits with and receivables from broker-dealers, clearing organizations, and counterparties, net $ (151.1) $ (1,455.7) Total fair value included in Receivables from clients, net $ (0.1) $ (0.5) Total fair value included in Financial instruments owned, at fair value $ 304.9 $ 192.6 Total fair value included in Payables to clients $ (296.5) $ (1,392.4) Total fair value included in Payables to broker-dealers, clearing organizations and counterparties $ 3.2 $ 55.8 Total fair value included in Financial instruments sold, not yet purchased, at fair value $ 406.6 $ 384.0 (1) As of June 30, 2023 and September 30, 2022, the Company’s derivative contract volume for open positions was approximately 12.8 million and 13.3 million contracts, respectively. The Company’s derivative contracts are principally held in its Commercial and Retail segments. The Company assists its Commercial segment clients 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 segment clients with option products, including combinations of buying and selling puts and calls. In its Retail segment, the Company provides its retail clients with access to spot foreign exchange, precious metals trading, as well as contracts for a difference (“CFDs”) and spread bets, where permitted. The Company mitigates its risk by generally offsetting the client’s transaction simultaneously with one of the Company’s trading counterparties or will offset that transaction 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. Hedging Activities The Company uses interest rate derivatives, in the form of swaps, to hedge risk related to variability in overnight rates. These hedges are designated cash flow hedges, through which the Company mitigates uncertainty in its interest income by converting floating-rate interest income to fixed-rate interest income. While the swaps mitigate interest rate risk, they do introduce credit risk, which is the possibility that the Company’s trading counterparty fails to meet its obligation. The Company minimizes this risk by entering into its swaps with highly-rated, multi-national institutions. In addition to credit risk, there is market risk associated with the swap positions. The Company’s market risk is limited, because any amounts the Company must pay from having exchanged variable interest will be funded by the variable interest the Company receives on its deposits. As of June 30, 2023, the Company’s hedges will all have matured by approximately 2 years from the end of the current period. The Company also uses foreign currency derivatives, in the form of forward contracts, to hedge risk related to the variability in exchange rates relative to certain of the Company’s non-USD expenditures. These hedges are designated cash flow hedges, through which the Company mitigates variability in exchange rates by exchanging foreign currency for USD at fixed exchange rates at a pre-determined future date, or several cash flows at several pre-determined future dates. While the forward contracts mitigate exchange rate variability risk, they do introduce credit risk, which is the possibility that the Company’s trading counterparty fails to meet its obligation. The Company minimizes this risk by entering into its forward contracts with highly-rated, multi-national institutions. These hedges will all mature within 2 years from the end of the current period. The Company assesses the effectiveness of its hedges at each reporting period to identify any required reclassifications into current earnings. During the three months ended June 30, 2023 and 2022, the Company did not designate any portion of its hedges as ineffective and thus did not have any values in current earnings related to ineffective hedges. The fair values of derivative instruments designated for hedging held as of June 30, 2023 and September 30, 2022 are as follow: June 30, 2023 September 30, 2022 (in millions) Balance Sheet Location Fair Value Fair Value Asset Derivatives Derivatives designated as hedging instruments: Foreign currency forward contracts Financial instruments owned, net $ 7.5 $ — Total derivatives designated as hedging instruments $ 7.5 $ — Derivative assets expected to be released from Other comprehensive income into current earnings: Foreign currency forward contracts $ 5.2 $ — Total expected to be released from Other comprehensive income into earnings $ 5.2 $ — Liability Derivatives Derivatives designated as hedging instruments: Interest rate contracts Financial instruments sold, not yet purchased $ 37.6 $ 48.8 Foreign currency forward contracts Financial instruments sold, not yet purchased — 21.8 Total derivatives designated as hedging instruments $ 37.6 $ 70.6 Derivative liabilities expected to be released from Other comprehensive income into current earnings: Interest rate contracts $ 23.2 $ 9.7 Foreign currency forward contracts — 8.9 Total expected to be released from Other comprehensive income into earnings $ 23.2 $ 18.6 The notional values of derivative instruments designated for hedging held as of June 30, 2023 and September 30, 2022 are as follow: June 30, 2023 September 30, 2022 (in millions) Notional Value Notional Value Derivatives designated as hedging instruments: Interest rate contracts $ 2,000.0 $ 1,500.0 Foreign currency forward contracts: Foreign currency forward contracts to purchase Polish Zloty: Local currency zł 156.1 zł — USD $ 33.7 $ — Foreign currency forward contracts to purchase British Pound Sterling: Local currency £ 168.0 £ 168.0 USD $ 207.2 $ 207.3 The Condensed Consolidated Income Statement effects of derivative instruments designated for hedging held for the three and nine months ended June 30, 2023 and 2022 are as follows: (in millions) Income Statement Location Three Months Ended June 30, 2023 Nine Months Ended June 30, 2023 Total amounts in income related to hedges Interest rate contracts Interest income $ (14.3) $ (31.3) Foreign currency forward contracts Compensation and benefits 1.6 2.1 Total derivatives designated as hedging instruments $ (12.7) $ (29.2) Loss on cash flow hedging relationships: Amount of loss reclassified from accumulated other comprehensive income into income $ (12.7) $ (29.2) Amount of gain reclassified from accumulated other comprehensive income into income as a result of a forecasted transaction that is no longer probable of occurring $ — $ — (in millions) Income Statement Location Three Months Ended June 30, 2022 Nine Months Ended June 30, 2022 Total amounts in income related to hedges Interest rate contracts Interest Income $ 0.1 $ 1.8 Total derivatives designated as hedging instruments $ 0.1 $ 1.8 Gain on cash flow hedging relationships: Amount of gain reclassified from accumulated other comprehensive income into income $ 0.1 $ 1.8 Amount of gain reclassified from accumulated other comprehensive income into income as a result of a forecasted transaction that is no longer probable of occurring $ — $ — The accumulated other comprehensive income effects of derivative instruments designated for hedging held for three and nine months ended June 30, 2023 and 2022 are as follow: Three Months Ended June 30, 2023 (in millions) Amount of Gain/(Loss) Recognized in Other Comprehensive Income on Derivatives, net of tax Location of amount Reclassified from Accumulated Other Comprehensive Income into Income Amount Reclassified from Accumulated Other Comprehensive Income into Income Derivatives in Cash Flow Hedging Relationships: Interest rate contracts $ (0.7) Interest Income $ (14.3) Foreign currency forward contracts 3.3 Compensation and benefits 1.6 Total $ 2.6 $ (12.7) Nine Months Ended June 30, 2023 (in millions) Amount of Gain Recognized in Other Comprehensive Income on Derivatives, net of tax Location of Gain Reclassified from Accumulated Other Comprehensive Income into Income Amount Reclassified from Accumulated Other Comprehensive Income into Income Derivatives in Cash Flow Hedging Relationships: Interest rate contracts $ 8.5 Interest Income $ (31.3) Foreign currency forward contracts 23.1 Compensation and benefits 2.1 Total $ 31.6 $ (29.2) Three Months Ended June 30, 2022 (in millions) Amount of Gain/(loss) Recognized in Other Comprehensive Income on Derivatives, net of tax Location of amount Reclassified from Accumulated Other Comprehensive Income into Income Amount Reclassified from Accumulated Other Comprehensive Income into Income Derivatives in Cash Flow Hedging Relationships: Interest rate contracts $ 6.8 Interest Income $ 0.1 Total $ 6.8 $ 0.1 Nine Months Ended June 30, 2022 (in millions) Amount of Loss Recognized in Other Comprehensive Income on Derivatives, net of tax Location of Gain Reclassified from Accumulated Other Comprehensive Income into Income Amount of Gain Reclassified from Accumulated Other Comprehensive Income into Income Derivatives in Cash Flow Hedging Relationships: Interest rate contracts $ 25.0 Interest Income $ 1.8 Total $ 25.0 $ 1.8 The following table sets forth the Company’s net gains/(losses) related to derivative financial instruments for the three and nine months ended June 30, 2023 and 2022 in accordance with the Derivatives and Hedging Topic of the ASC. The net gains/(losses) set forth below are included in Principal gains, net and Cost of sales of physical commodities in the Condensed Consolidated Income Statements. Three Months Ended June 30, Nine Months Ended June 30, (in millions) 2023 2022 2023 2022 Commodities $ 105.3 $ 69.9 $ 307.3 $ 218.8 Foreign exchange (10.8) 47.5 (34.8) 127.2 Interest rate, equities, and indices 51.6 29.5 85.5 82.3 TBA and forward settling securities 42.0 66.2 4.9 158.2 Net gains from derivative contracts $ 188.1 $ 213.1 $ 362.9 $ 586.5 Credit Risk In the normal course of business, the Company purchases and sells financial instruments, commodities and foreign currencies as either a principal or agent on behalf of its clients. If either the client or counterparty fails to perform, the Company may be required to discharge the obligations of the nonperforming party. In such circumstances, the Company may sustain a loss if the fair value of the financial instrument, commodity, or foreign currency is different from the contract value of the transaction. The majority of the Company’s transactions and, consequently, the concentration of its credit exposure are with commodity exchanges, clients, broker-dealers and other financial institutions. These activities primarily involve collateralized and uncollateralized arrangements and may result in credit exposure in the event that a counterparty fails to meet its contractual obligations. The Company’s exposure to credit risk can be directly impacted by volatile financial markets, which may impair counterparties’ ability to satisfy contractual obligations. The Company seeks to control its credit risk through a variety of reporting and control procedures, including establishing credit and/or position limits based upon a review of the counterparties’ financial condition and credit ratings. The Company monitors collateral levels on a daily basis for compliance with regulatory and internal guidelines and requests changes in collateral levels as appropriate. The Company is a party to financial instruments in the normal course of its business through client and proprietary trading accounts in exchange-traded and OTC derivative instruments. These instruments are primarily the result of the execution of orders for commodity futures, options on futures, OTC swaps and options and spot and forward foreign currency contracts on behalf of its clients, substantially all of which are transacted on a margin basis. Such transactions may expose the Company to significant credit risk in the event that margin requirements are not sufficient to fully cover losses which clients may incur. The Company controls the risks associated with these transactions by requiring clients to maintain margin deposits in compliance with individual exchange regulations and internal guidelines. The Company monitors required margin levels daily, and therefore, may require clients to deposit additional collateral or reduce positions when necessary. The Company also establishes credit limits for clients, which are monitored daily. The Company evaluates each client’s creditworthiness on a case by case basis. Clearing, financing, and settlement activities may require the Company to maintain funds with or pledge securities as collateral with other financial institutions. Generally, these exposures to both clients and exchanges are subject to master netting, or client agreements, which reduce the exposure to the Company by permitting receivables and payables with such clients to be offset in the event of a client default. Management believes that the margin deposits held as of June 30, 2023 and September 30, 2022 were adequate to minimize the risk of material loss that could be created by positions held at that time. Additionally, the Company monitors collateral fair value on a daily basis and adjusts collateral levels in the event of excess market exposure. Derivative financial instruments involve varying degrees of off-balance sheet market risk whereby changes in the fair values of underlying financial instruments may result in changes in the fair value of the financial instruments in excess of the amounts reflected in the consolidated balance sheets. Exposure to market risk is influenced by a number of factors, including the relationships between the financial instruments and the Company’s positions, as well as the volatility and liquidity in the markets in which the financial instruments are traded. The principal risk components of financial instruments include, among other things, interest rate volatility, the duration of the underlying instruments and changes in commodity pricing and foreign

Allowance for Doubtful Accounts

Allowance for Doubtful Accounts	9 Months Ended
	Jun. 30, 2023
Receivables [Abstract]
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts The allowance for doubtful accounts related to deposits with and receivables from broker-dealers, clearing organizations, and counterparties was $0.1 million as of June 30, 2023 and $1.4 million as of September 30, 2022. The allowance for doubtful accounts related to receivables from clients was $53.2 million and $46.4 million as of June 30, 2023 and September 30, 2022, respectively. The Company had no allowance for doubtful accounts related to notes receivable as of June 30, 2023 and September 30, 2022. Activity in the allowance for doubtful accounts for the nine months ended June 30, 2023 was as follows: (in millions) Balance as of September 30, 2022 $ 47.8 Provision for bad debts 6.9 Allowance charge-offs (1.4) Balance as of June 30, 2023 $ 53.3

Physical Commodities Inventory

Physical Commodities Inventory	9 Months Ended
	Jun. 30, 2023
Inventory Disclosure [Abstract]
Physical Commodities Inventory	Physical Commodities Inventory The Company’s inventories consist of finished physical commodities as shown below. (in millions) June 30, September 30, Physical Ag & Energy (1) $ 157.9 $ 223.6 Precious metals - held by broker-dealer subsidiary 117.3 136.3 Precious metals - held by non-broker-dealer subsidiaries 169.5 153.6 Physical commodities inventory, net $ 444.7 $ 513.5 (1) Physical Ag & Energy consists of agricultural commodity inventories, including corn, soybeans, wheat, dried distillers grain, canola, sorghum, coffee, cocoa, cotton, and others. Agricultural inventories have reliable, readily determinable and realizable market prices, have relatively insignificant costs of disposal and are available for immediate delivery. Physical Ag & Energy also includes energy related inventories, including primarily propane, gasoline, and kerosene. The Company records changes to these values in Cost of sales of physical commodities on the Condensed Consolidated Income Statements.

Goodwill

Goodwill	9 Months Ended
	Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	Goodwill Goodwill allocated to the Company’s operating segments is as follows: (in millions) June 30, September 30, Commercial $ 33.8 $ 32.6 Institutional 9.8 9.8 Retail 5.8 5.8 Global Payments 10.0 10.0 Total Goodwill $ 59.4 $ 58.2

Intangible Assets

Intangible Assets	9 Months Ended
	Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible Assets The gross and net carrying values of intangible assets as of the balance sheet dates, by major intangible asset class are as follows (in millions): June 30, 2023 September 30, 2022 Gross Amount Accumulated Net Amount Gross Amount Accumulated Net Amount Intangible assets subject to amortization Trade/domain names $ 4.1 $ (2.2) $ 1.9 $ 3.7 $ (1.6) $ 2.1 Software programs/platforms 28.6 (26.1) 2.5 28.3 (19.4) 8.9 Client and supplier base 38.3 (22.6) 15.7 29.5 (18.0) 11.5 Total intangible assets subject to amortization 71.0 (50.9) 20.1 61.5 (39.0) 22.5 Intangible assets not subject to amortization Website domains 2.0 — 2.0 1.8 — 1.8 Business licenses 3.7 — 3.7 3.7 — 3.7 Total intangible assets not subject to amortization 5.7 — 5.7 5.5 — 5.5 Total intangible assets $ 76.7 $ (50.9) $ 25.8 $ 67.0 $ (39.0) $ 28.0 Amortization expense related to intangible assets was $3.9 million and $3.6 million for the three months ended June 30, 2023 and 2022, respectively. Amortization expense related to intangible assets was $11.9 million and $11.0 million for the nine months ended June 30, 2023 and 2022, respectively. As of June 30, 2023, the estimated future amortization expense was as follows: (in millions) Fiscal 2023 (remaining three months) $ 2.5 Fiscal 2024 6.8 Fiscal 2025 3.6 Fiscal 2026 2.8 Fiscal 2027 and thereafter 4.4 Total intangible assets subject to amortization $ 20.1

Credit Facilities

Credit Facilities	9 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Credit Facilities	Credit Facilities Committed Credit Facilities The Company has four committed credit facilities, including a senior secured term loan, under which the Company and its subsidiaries may borrow up to $1,155.0 million, subject to the terms and conditions for these facilities. The amounts outstanding under these credit facilities carry variable rates of interest, thus approximating fair value. The Company’s committed credit facili ties consist of the following: • A first-lien senior secured syndicated loan facility is available to the Company for general working capital requirements and capital expenditures. This revolving credit facility was amended during the period to increase the amount available from $475.0 million to $500.0 million and extend the maturity to April 21, 2026. • An unsecured syndicated committed line of credit under which $180.0 million is available to the Company’s wholly owned subsidiary, StoneX Financial Inc., to provide short-term funding of margin to commodity exchanges. The line of credit is subject to annual review and its continued availability is subject to StoneX Financial Inc.’s financial condition and operating results continuing to be satisfactory as set forth in the relevant agreement. This facility was amended during the nine months ended June 30, 2023 to increase the amount available from $75.0 million to $180.0 million and extend the maturity to December 11, 2023. • A $400.0 million syndicated committed borrowing facility available to the Company’s wholly owned subsidiary, StoneX Commodity Solutions LLC, to finance commodity financing arrangements and commodity repurchase agreements. The facility is secured by the assets of StoneX Commodity Solutions LLC and guaranteed by the Company. • An unsecured syndicated committed borrowing facility under which $75.0 million is available to the Company’s wholly owned subsidiary, StoneX Financial Ltd., for short-term funding of margin to commodity exchanges. This facility matures on October 14, 2023. The facility is guaranteed by the Company. Uncommitted Credit Facilities The Company has access to certain uncommitted financing agreements that support its ordinary course securities and commodities inventories. The agreements are subject to certain borrowing terms and conditions. Note Payable to Bank In December 2020, the Company obtained a $9.0 million loan from a commercial bank, secured by equipment purchased with the proceeds. The note is payable in monthly installments, with the final payment due during December 2025. The note bears interest at a rate per annum equal to the Index rate, as defined in the agreement, plus 2.35%. Senior Secured Notes On June 11, 2020, the Company completed the issuance and sale of $350 million in aggregate principal amount of the Company’s 8.625% Senior Secured Notes due 2025 (the “Notes”) at the offering price of 98.5% of the aggregate principal amount. The Company used the proceeds from the issuance of the Notes to fund the consideration for the acquisition of Gain Capital Holdings, Inc., to pay acquisition related costs, and to fund the redemption of the amount of Gain’s notes outstanding at acquisition. The Notes will mature on June 15, 2025. Interest on the Notes accrues at a rate of 8.625% per annum and is payable semiannually in arrears on June 15 and December 15 of each year, commencing on December 15, 2020. In connection with issuing the Notes, the Company incurred debt issuance costs of $9.5 million, which are being amortized over the term of the Notes under the effective interest method. The following table sets forth a listing of credit facilities, the current committed amounts as of the report date on the facilities, and outstanding borrowings on the facilities, as well as indebtedness on a promissory note and the Notes as of the periods indicated: (in millions) Amounts Outstanding Borrower Security Renewal/Expiration Date Total Commitment June 30, 2023 September 30, Committed Credit Facilities Senior StoneX Group Inc. Committed Credit Facility - Revolving Line of Credit (1) April 21, 2026 $ 500.0 $ 230.0 (5) $ 260.0 StoneX Financial Inc. None December 11, 2023 180.0 — (5) — StoneX Commodity Solutions LLC Certain commodities assets July 28, 2024 400.0 162.1 (5) 217.0 StoneX Financial Ltd. None October 14, 2023 75.0 — (5) — $ 1,155.0 $ 392.1 $ 477.0 Uncommitted Credit Facilities Various 22.9 (5) — Note Payable to Bank Certain equipment 7.6 (5) 8.1 Senior Secured Notes (2) 341.3 (3),(4) 339.1 Total outstanding borrowings $ 763.9 $ 824.2 (1) The StoneX Group Inc. committed credit facility is secured by substantially all of the assets of StoneX Group Inc. and certain subsidiaries identified in the credit facility agreement as obligors, and pledged equity of certain subsidiaries identified in the credit facility as limited guarantors. The maturity date remains April 21, 2025 for one lender representing $42.5 million of the facility commitment. (2) The Notes and the related guarantees are secured by liens on substantially all of the Company’s and the guarantors’ assets, subject to certain customary and other exceptions and permitted liens. The liens on the assets that secure the Notes and the related guarantees are contractually subordinated to the liens on the assets that secure the Company’s and the guarantors’ existing and future first lien secured indebtedness, including indebtedness under the Company’s senior committed credit facility. (3) Amounts outstanding under the Notes are reported net of unamortized original issue discount of $6.6 million and $8.8 million, in the respective periods presented. (4) Included in Senior secured borrowings, net on the Condensed Consolidated Balance Sheets . (5) Included in Lenders under loans on the Condensed Consolidated Balance Sheets . As reflected above, some of the Company’s committed credit facilities are scheduled to expire during the next twelve months following the quarterly period ended June 30, 2023. The Company intends to renew or replace the other facilities as they expire, and based on the Company’s liquidity position and capital structure, the Company believes it will be able to do so. The Company’s credit facility agreements contain financial covenants relating to financial measures on a consolidated basis, as well as on a certain stand-alone subsidiary basis, including minimum tangible net worth, minimum regulatory capital, minimum

Securities and Commodity Financ

Securities and Commodity Financing Transactions	9 Months Ended
	Jun. 30, 2023
Broker-Dealer [Abstract]
Securities and Commodity Financing Transactions	Securities and Commodity Financing Transactions The Company’s repurchase agreements and securities borrowing and lending arrangements are generally recorded at cost in the Condensed Consolidated Balance Sheets, which is a reasonable approximation of their fair values due to their short-term nature. Secured borrowing and lending arrangements are entered into to obtain collateral necessary to effect settlement, finance inventory positions, meet customer needs or re-lend as part of our dealer operations. The fair value of securities loaned and borrowed is monitored daily compared with the related payable or receivable, and additional collateral or returning excess collateral is requested, as appropriate. These arrangements may serve to limit credit risk resulting from our transactions with our counterparties. Financial instruments are pledged as collateral under repurchase agreements, securities lending agreements and other secured arrangements, including clearing arrangements. Agreements with counterparties generally contain contractual provisions allowing counterparties the right to sell or repledge collateral. Either the Company or its counterparties may require additional collateral. All collateral is held by the Company or a custodian. The following tables set forth the carrying value of repurchase agreements, and securities lending agreements by remaining contractual maturity (in millions): June 30, 2023 Overnight and Open Less than 30 Days 30-90 Days Over 90 Days Total Securities sold under agreements to repurchase $ 11,141.4 $ 557.9 $ 69.1 $ 45.0 $ 11,813.4 Securities loaned 1,093.3 — — — 1,093.3 Gross amount of secured financing $ 12,234.7 $ 557.9 $ 69.1 $ 45.0 $ 12,906.7 September 30, 2022 Overnight and Open Less than 30 Days 30-90 Days Over 90 Days Total Securities sold under agreements to repurchase $ 3,664.7 $ 2,279.1 $ 186.3 $ 3.4 $ 6,133.5 Securities loaned 1,189.5 — — — 1,189.5 Gross amount of secured financing $ 4,854.2 $ 2,279.1 $ 186.3 $ 3.4 $ 7,323.0 Offsetting of Collateralized Transactions The following table sets forth the carrying value of repurchase agreements and securities lending agreements by class of collateral pledged (in millions): Securities sold under agreements to repurchase June 30, 2023 September 30, 2022 U.S. Treasury obligations $ 6,169.3 $ 1,311.0 U.S. government agency obligations 676.5 604.1 Asset-backed obligations 122.6 178.0 Agency mortgage-backed obligations 4,425.9 3,762.5 Foreign government obligations 130.6 97.2 Corporate bonds 288.5 180.7 Total securities sold under agreement to repurchase $ 11,813.4 $ 6,133.5 Securities loaned Equity securities $ 1,093.3 $ 1,189.5 Total securities loaned 1,093.3 1,189.5 Gross amount of secured financing $ 12,906.7 $ 7,323.0 The following tables provide the netting of securities purchased under agreements to resell, securities sold under agreements to repurchase, securities borrowed and securities loaned as of the periods indicated (in millions): June 30, 2023 Offsetting of collateralized transactions: Gross Amounts Recognized Amounts Offset in the Condensed Consolidated Balance Sheet Net Amounts Presented in the Condensed Consolidated Balance Sheet Securities purchased under agreements to resell $ 9,425.9 $ (6,783.9) $ 2,642.0 Securities borrowed $ 1,094.3 $ — $ 1,094.3 Securities sold under agreements to repurchase $ 11,813.4 $ (6,783.9) $ 5,029.5 Securities loaned $ 1,093.3 $ — $ 1,093.3 September 30, 2022 Offsetting of collateralized transactions: Gross Amounts Recognized Amounts Offset in the Condensed Consolidated Balance Sheet Net Amounts Presented in the Condensed Consolidated Balance Sheet Securities purchased under agreements to resell $ 4,609.9 $ (2,937.9) $ 1,672.0 Securities borrowed $ 1,209.8 $ — $ 1,209.8 Securities sold under agreements to repurchase $ 6,133.5 $ (2,937.9) $ 3,195.6 Securities loaned $ 1,189.5 $ — $ 1,189.5 The Company pledges securities owned as collateral in both tri-party and bilateral arrangements. Pledged securities under tri-party arrangements may not be repledged or sold by the Company’s counterparties, whereas bilaterally pledged securities may be. The approximate fair value of pledged securities that can be sold or repledged by the Company’s counterparties has been parenthetically disclosed on the Condensed Consolidated Balance Sheets. The Company receives securities as collateral under reverse repurchase agreements, securities borrowed agreements, and margin securities held on behalf of counterparties. This collateral is used by the Company to cover financial instruments sold, not yet purchased; to obtain financing in the form of repurchase agreements; and to meet counterparties’ needs under lending arrangement and matched-booked trading strategies. Additional securities collateral is obtained as necessary to ensure such transactions are adequately collateralized. In many instances, the Company is permitted by contract to repledge the securities received as collateral, which may include pledges to cover collateral requirements for tri-party repurchase agreements. The following table sets forth the carrying value of collateral pledged, received and repledged (in millions): June 30, 2023 September 30, 2022 Securities pledged or repledged to cover collateral requirements for tri-party arrangements $ 5,039.7 $ 3,787.8 Securities received as collateral that may be repledged $ 10,636.0 $ 5,836.1 Securities received as collateral that may be repledged covering securities sold short $ 2,149.1 $ 1,615.3 Repledged securities borrowed and client securities held under custodial clearing arrangements to collateralize securities loaned agreements $ 1,084.3 $ 1,146.0

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Jun. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Contingencies In November 2018, balances in approximately 300 client accounts of the FCM division of the Company’s wholly owned subsidiary, StoneX Financial Inc., declined below required maintenance margin levels and into deficit balances, primarily as a result of significant and unexpected price fluctuations in the natural gas markets. All positions in these accounts, which were managed by OptionSellers.com Inc. (“OptionSellers”), an independent Commodity Trading Advisor (“CTA”), were liquidated in accordance with StoneX Financial Inc.’s client agreements and obligations under market regulation standards. A CTA is registered with the U.S. Commodity Futures Trading Commission (“CFTC”) and a member of, and subject to audit by, the National Futures Association (“NFA”). OptionSellers was registered under a CFTC Rule 4.7 exemption for providing services only to “qualified eligible persons,” which requires the account holders authorizing OptionSellers to act as their CTA to meet or exceed certain minimum financial requirements. OptionSellers, in its role as a CTA, had been granted by each of its clients full discretionary authority to manage the trading in the clients’ accounts, while StoneX Financial Inc. acted solely as the clearing firm in its role as the FCM. StoneX Financial Inc.’s client agreements hold account holders liable for all losses in their accounts and obligate the account holders to reimburse StoneX Financial Inc. for any deficits in their accounts. As of June 30, 2023, the receivable from these client accounts, net of collections and other allowable deductions, was $20.8 million, with no individual account receivable exceeding $1.4 million. As of June 30, 2023, the allowance against these uncollected balances was $6.6 million. The Company is pursuing collection of the uncollected balances through arbitration proceedings against the account holders. The Company will consider developments in these proceedings, and any other relevant matters, in determining whether any changes in the allowance against the uncollected balances are required. In these and other arbitration proceedings, clients are seeking damages from StoneX Financial Inc. related to the trading losses in their accounts. During the nine months ended June 30, 2023, the Company reached privately negotiated settlements of a number of arbitration proceedings, pursuant to which in most cases the account holders agreed to pay all or a substantial portion of their outstanding deficit balances and in some cases the Company agreed to make certain payments to the account holders that are not material to the Company, individually or in the aggregate. The Company intends to continue vigorously pursuing claims through arbitration and settling cases in what the Company determines to be appropriate circumstances. The ultimate outcome of remaining arbitrations cannot presently be determined. Depending on future collections and the outcomes of arbitration proceedings, any provisions for bad debts and actual losses may or may not be material to the Company’s financial results. However, the Company believes that the likelihood of a material adverse outcome is remote, and does not currently believe that any potential losses related to this matter would impact its ability to comply with its ongoing liquidity, capital, and regulatory requirements. Legal Proceedings From time to time and in the ordinary course of business, the Company is involved in various legal actions and proceedings, including tort claims, contractual disputes, employment matters, workers’ compensation claims and collections. The Company carries insurance that provides protection against certain types of claims, up to the relevant policy’s limits. As of June 30, 2023 and September 30, 2022, the Condensed Consolidated Balance Sheets include loss contingency accruals which are not material, individually or in the aggregate, to the Company’s financial position or liquidity. In the opinion of management, possible exposure from loss contingencies in excess of the amounts accrued, is not likely to be material to the Company’s earnings, financial position or liquidity. Other than the updates provided within Contingencies , above, there have been no material changes to the legal actions and proceedings compared to September 30, 2022. Contractual Commitments Self-Insurance The Company self-insures its costs related to medical and dental claims. The Company is self-insured, up to a stop loss amount, for eligible participating employees and retirees, and for qualified dependent medical and dental claims, subject to deductibles and limitations. As of June 30, 2023, the Company had $1.6 million accrued for self-insured medical and dental claims included in Accounts payable and other accrued liabilities in the Condensed Consolidated Balance Sheet.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss, Net	9 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Accumulated Other Comprehensive Loss, Net	Accumulated Other Comprehensive Loss, Net Comprehensive income consists of net income and other gains and losses affecting stockholders’ equity that, under U.S. GAAP, are excluded from net income. Other comprehensive income includes net actuarial losses from defined benefit pension plans, foreign currency translation adjustments, and cash flow hedge gains or losses. See notes 1 and 4 for additional information on cash flow hedges. The following table summarizes the changes in accumulated other comprehensive loss, net for the nine months ended June 30, 2023. (in millions) Foreign Currency Translation Adjustment Pension Benefits Adjustment Cash Flow Hedge Accumulated Other Comprehensive Loss, net Balances as of September 30, 2022 $ (34.4) $ (2.7) $ (53.5) $ (90.6) Other comprehensive income, net of tax 15.5 — 31.6 47.1 Balances as of June 30, 2023 $ (18.9) $ (2.7) $ (21.9) $ (43.5)

Revenue from Contracts with Cli

Revenue from Contracts with Clients	9 Months Ended
	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Clients	Revenue from Contracts with Clients The Company accounts for revenue earned from contracts with clients for services such as the execution, clearing, brokering, and custody of futures and options on futures contracts, OTC derivatives, and securities, investment management, and underwriting services in accordance with FASB ASC 606, Revenues from Contracts with Customers (Topic 606). Revenues for these services are recognized when the performance obligations related to the underlying transaction are completed. Revenues are recognized when control of the promised goods or services are transferred to clients, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those goods or services. Revenues are analyzed to determine whether the Company is the principal (i.e. reports revenue on a gross basis) or agent (i.e., reports revenues on a net basis) in the contract. Principal or agent designations depend primarily on the control an entity has over the good or service before control is transferred to a client. The indicators of which party exercises control include primary responsibility over performance obligations, inventory risk before the good or service is transferred, and discretion in establishing the price. Topic 606 does not apply to revenues associated with dealing, or market-making, activities in financial instruments or contracts in the capacity of a principal, including derivative sales contracts which result in physical settlement and interest income. Revenues within the scope of Topic 606 are presented within Commission and clearing fees and Consulting, management, and account fees on the Condensed Consolidated Income Statements. Revenues that are not within the scope of Topic 606 are presented within Sales of physical commodities , Principal gains, net , and Interest income on the Condensed Consolidated Income Statements. Three Months Ended June 30, Nine Months Ended June 30, (in millions) 2023 2022 2023 2022 Revenues from contracts with clients as a percentage of total revenues 6.5 % 4.5 % 6.4 % 5.5 % The following table represents a disaggregation of the Company’s total revenues separated between revenues from contracts with clients and other sources of revenue for the periods indicated. Three Months Ended June 30, Nine Months Ended June 30, (in millions) 2023 2022 2023 2022 Revenues from contracts with clients: Commission and clearing fees: Sales-based: Exchange-traded futures and options $ 57.6 $ 53.1 $ 161.6 $ 155.4 OTC derivative brokerage 2.0 4.0 10.1 13.3 Equities and fixed income 13.6 15.4 44.6 47.1 Mutual funds 0.7 1.0 2.2 3.4 Insurance and annuity products 2.0 2.2 6.5 7.4 Other 2.0 0.6 4.2 2.3 Total sales-based commission 77.9 76.3 229.2 228.9 Trailing: Mutual funds 3.1 3.4 9.2 10.9 Insurance and annuity products 3.5 3.9 10.5 12.5 Total trailing commission 6.6 7.3 19.7 23.4 Clearing fees 38.6 38.8 114.6 115.8 Trade conversion fees 1.7 3.0 6.1 9.0 Other 2.0 1.5 5.9 4.5 Total commission and clearing fees 126.8 126.9 375.5 381.6 Consulting, management, and account fees: Underwriting fees 0.2 0.1 0.5 0.4 Asset management fees 11.5 11.5 33.3 33.5 Advisory and consulting fees 8.4 8.2 26.1 23.2 Sweep program fees 12.3 2.5 36.6 3.5 Client account fees 4.0 3.8 11.5 11.8 Other 2.8 1.6 11.7 4.8 Total consulting, management, and account fees 39.2 27.7 119.7 77.2 Sales of physical commodities: Precious metals sales 814.7 696.0 2,349.7 2,283.3 Total revenues from contracts with clients $ 980.7 $ 850.6 $ 2,844.9 $ 2,742.1 Method of revenue recognition: Point-in-time $ 941.9 $ 821.1 $ 2,729.2 $ 2,658.5 Time elapsed 38.8 29.5 115.7 83.6 Total revenues from contracts with clients 980.7 850.6 2,844.9 2,742.1 Other sources of revenues Physical precious metals trading 12,513.4 16,808.1 36,695.5 43,334.7 Physical agricultural and energy product trading 991.1 926.9 3,183.6 2,596.1 Principal gains, net 300.0 295.2 810.8 869.8 Interest income 262.7 50.1 685.7 112.3 Total revenues $ 15,047.9 $ 18,930.9 $ 44,220.5 $ 49,655.0 Total revenues by primary geographic region: United States $ 1,428.9 $ 1,278.3 $ 4,463.6 $ 3,607.6 Europe 1,014.8 813.1 2,841.8 2,631.3 South America 65.9 21.7 184.6 63.0 Middle East and Asia 12,534.9 16,814.7 36,721.2 43,345.4 Other 3.4 3.1 9.3 7.7 Total revenues $ 15,047.9 $ 18,930.9 $ 44,220.5 $ 49,655.0 Operating revenues by primary geographic region: United States $ 559.6 $ 354.7 $ 1,588.0 $ 1,023.3 Europe 145.1 125.8 352.1 364.8 South America 34.3 21.7 97.8 63.0 Middle East and Asia 34.4 23.5 88.9 65.3 Other 3.5 3.1 9.3 7.6 Total operating revenues $ 776.9 $ 528.8 $ 2,136.1 $ 1,524.0 The substantial majority of the Company’s performance obligations for revenues from contracts with clients are satisfied at a point in time and are typically collected from clients by debiting their accounts with the Company. Commission and clearing fee revenue and consulting, management, and account fees revenue are primarily related to the Commercial, Institutional and Retail reportable segments. Principal gains, net are contributed by all of the Company’s reportable segments. Interest income is primarily related to the Commercial and Institutional reportable segments. Precious metals trading and agricultural and energy product trading revenues are primarily related to the Commercial reportable segment. Precious metals sales that are recognized on a point-in-time basis are included in the Retail and the Commercial reportable segments Principal gains, net also includes dividend income on long equity positions and dividend expense on short equity positions, which are recognized on the ex-dividend date. The following table indicates the relevant income and expense: Three Months Ended June 30, Nine Months Ended June 30, (in millions) 2023 2022 2023 2022 Dividend income on long equity positions $ 10.2 $ 31.6 $ 27.5 $ 119.1 Dividend expense on short equity positions 11.6 32.0 28.8 109.9 Dividend (loss)/income, net reported within Principal Gains, net $ (1.4) $ (0.4) $ (1.3) $ 9.2 Remaining Performance Obligations Remaining performance obligations are services that the Company has committed to perform in the future in connection with its contracts with clients. The Company’s remaining performance obligations are generally related to its risk management consulting and asset management contracts with clients. Revenues associated with remaining performance obligations related to these contracts with clients are not material to the overall consolidated results of the Company. For the Company’s asset management activities, where fees are calculated based on a percentage of the fair value of eligible assets in client’s accounts, future revenue associated with remaining performance obligations cannot be determined as such fees are subject to fluctuations in the fair value of eligible assets in clients’ accounts.

Other Expenses

Other Expenses	9 Months Ended
	Jun. 30, 2023
Other Expenses [Abstract]
Other Expenses	Other Expenses Other expenses consisted of the following, for the periods indicated. Three Months Ended June 30, Nine Months Ended June 30, (in millions) 2023 2022 2023 2022 Non-income taxes $ 4.1 $ 4.6 $ 11.0 $ 13.7 Insurance 2.5 2.8 8.2 8.2 Employee related expenses 2.1 2.9 8.0 6.9 Other direct business expenses 3.0 2.5 11.1 6.9 Membership fees 0.9 0.6 2.8 2.4 Director and public company expenses 0.5 0.3 1.5 1.3 Office expenses 0.5 0.4 1.4 1.2 Other expenses 1.8 1.7 6.1 4.0 Total other expenses $ 15.4 $ 15.8 $ 50.1 $ 44.6

Income Taxes

Income Taxes	9 Months Ended
	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The income tax provision for interim periods comprises income tax on ordinary income/(loss) figures provided at the most recent estimated annual effective income tax rate, adjusted for the income tax effect of discrete items. Management uses an estimated annual effective income tax rate based on the forecasted pretax income/(loss) and statutory tax rates in the various jurisdictions in which it operates. The Company’s effective income tax rate differs from the U.S. statutory income tax rate primarily due to state and local taxes, global intangible low taxed income (“GILTI”), and differing statutory tax rates applied to the income of non-U.S. subsidiaries. The Company records the tax effect of certain discrete items, including the effects of changes in tax laws, tax rates and adjustments with respect to valuation allowances or other unusual or nonrecurring tax adjustments, in the interim period in which they occur, as an addition to, or reduction from, the income tax provision, rather than being included in the estimated effective annual income tax rate. In addition, jurisdictions with a projected loss for the year or a year-to-date loss where no income tax benefit can be recognized are excluded from the estimated annual effective income tax rate. Deferred income tax balances reflect the effects of temporary differences between the carrying amounts of assets and liabilities and their tax bases and are stated at enacted tax rates expected to be in effect when taxes are actually paid or recovered. The Company is required to assess its deferred tax assets and the need for a valuation allowance at each reporting period. This assessment requires judgment on the part of management with respect to benefits that may be realized. The Company will record a valuation allowance against deferred tax assets when it is considered more likely than not that all or a portion of the deferred tax assets will not be realized. Current and Prior Period Tax Expense Income tax expense of $25.0 million and $21.8 million for the three months ended June 30, 2023 and 2022, respectively, and income tax expense of $59.8 million and $56.0 million for the nine months ended June 30, 2023 and 2022, respectively, reflects estimated federal, foreign, state and local income taxes. The Company’s effective tax rate was 26% and 31% for the three months ended June 30, 2023 and 2022, respectively. The effective tax rate was higher than the U.S. federal statutory rate of 21% due to U.S. state and local taxes, GILTI, U.S. and foreign permanent differences, and the amount of foreign earnings taxed at higher rates.

Regulatory Capital Requirements

Regulatory Capital Requirements	9 Months Ended
	Jun. 30, 2023
Capital and Other Regulatory Requirements [Abstract]
Regulatory Capital Requirements	Regulatory Capital Requirements The Company’s activities are subject to significant governmental regulation, both in the U.S. and in the international jurisdictions in which it operates. Subsidiaries of the Company were in compliance with all of their regulatory requirements as of June 30, 2023. The following table details those subsidiaries with minimum regulatory requirements in excess of $10.0 million along with the actual balance maintained as of that date. (in millions) As of June 30, 2023 Subsidiary Regulatory Authority Actual Minimum StoneX Financial Inc. SEC and CFTC $ 364.4 $ 214.1 StoneX Financial Ltd. Financial Conduct Authority (“FCA”) $ 492.6 $ 358.0 Gain Capital Group, LLC CFTC and NFA $ 50.4 $ 29.3 StoneX Financial Pte. Ltd. Monetary Authority of Singapore ("MAS") $ 70.9 $ 22.1 StoneX Markets LLC CFTC and NFA $ 221.0 $ 123.7 Certain other subsidiaries of the Company, typically with a minimum requirement less than $10.0 million, are also subject to net capital requirements promulgated by authorities in the countries in which they operate. As of June 30, 2023, all of the Company’s subsidiaries were in compliance with their local regulatory requirements.

Acquisitions

Acquisitions	9 Months Ended
	Jun. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Acquisitions	Acquisitions Cotton Distributors Inc. On October 31, 2022, the Company’s wholly owned subsidiary, StoneX Netherlands B.V., acquired CDI-Societe Cotonniere De Distribution S.A (“CDI”), based in Switzerland. CDI operates a global cotton merchant business with clients and producers in Brazil and West Africa as well as buyers throughout Asia. The purchase price is approximately $42.7 million, which is based on CDI’s estimated acquisition date tangible book value as defined by the terms of the purchase agreement and based on Swiss accounting practices, and an earn-out payment due to the seller. The earn-out value is determined by CDI’s performance with respect to certain contracts entered into before the acquisition date and settling after the closing date. During the three months ended June 30, 2023, CDI contributed $11.7 million of Net operating revenue and $7.2 million of Net income . During the nine months ended June 30, 2023, CDI contributed $24.0 million of Net operating revenue and $12.3 million of Net incom e. The measurement period for the CDI acquisition remains open as the Company finalizes certain valuation calculations related to intangible assets, net tangible asset value adjustments, the fair values of forward contracts and other derivatives, as well as the earn-out due to the seller. The gain on acquisition was principally due to the fair value of commodity forward purchases and sales contracts and fair value of identified intangible assets acquired exceeding the consideration paid for these assets. (in millions) Fair Value Cash and cash equivalents $ 8.2 Deposits with and receivables from broker-dealers, clearing organizations, and counterparties 7.7 Receivables from clients, net 51.9 Financial instruments owned, at fair value 45.7 Deferred income taxes, net (3.3) Property and equipment, net 0.1 Physical commodities inventory, net 22.5 Other assets 6.7 Total fair value of tangible assets acquired 139.5 Accounts payable and other accrued liabilities 40.0 Financial instruments sold, not yet purchased, at fair value 28.3 Payables to lenders under loans 10.1 Payable to broker-dealers, clearing organizations, and counterparties 0.4 Payable to clients 2.6 Income taxes payable 0.8 Total fair value of tangible liabilities assumed 82.2 Fair value of tangible net assets acquired $ 57.3 Identifiable intangible assets acquired Client relationships $ 4.7 Supplier relationships 3.7 Trade name 0.4 Non-compete 0.1 Total fair value of intangible assets acquired 8.9 Fair value of identifiable net assets acquired 66.2 Total merger consideration 42.7 Gain on acquisition $ 23.5 Incomm S.A.S. On February 3, 2023, the Company’s subsidiary StoneX Commodity Solutions LLC executed a sale and purchase agreement to acquire all of the outstanding shares of Incomm S.A.S. (“Incomm”), a company duly incorporated and in existence according with the laws of Colombia. This transaction was effective on the closing date of February 3, 2023. Incomm was established to support the import of grain and feed products for Colombian clients, and is a proven resource in management of customs clearing, inventory management at destination ports and providing non-recourse trade finance for destination buyers via local Colombian banks. The purchase price consists of $0.2 million of cash consideration and also includes a contingent earn-out valued at approximately $1.3 million with annual payments over the four years following the acquisition. The contingent earn-out payments are variable in nature, as they equal a percentage of the acquired business line’s pre-tax profits, as defined in the purchase agreement. The business activities of Incomm will be assigned to the Company’s Commercial reportable segment. The acquisition generated $1.3 million of Goodwill.

Segment Analysis

Segment Analysis	9 Months Ended
	Jun. 30, 2023
Segment Reporting [Abstract]
Segment Analysis	Segment Analysis The Company’s operating segments are principally based on the nature of the clients we serve (commercial, institutional, and retail), and a fourth operating segment, its global payments business. The Company manages its business in this manner due to its large global footprint, in which it has approximately 4,000 employees allowing it to serve clients in more than 180 countries. The Company’s business activities are managed as operating segments and organized into reportable segments as follows: • Commercial • Institutional • Retail • Global Payments Commercial The Company offers commercial clients a comprehensive array of products and services, including risk management and hedging services, execution and clearing of exchange-traded and OTC products, voice brokerage, market intelligence and physical trading, as well as commodity financing and logistics services. The ability to provide these high-value-added products and services differentiates the Company from its competitors and maximizes the opportunity to retain clients. Institutional The Company provides institutional clients with a complete suite of equity trading services to help them find liquidity with best execution, consistent liquidity across a robust array of fixed income products, competitive and efficient clearing and execution in all major futures and securities exchanges globally, as well as prime brokerage in equities and major foreign currency pairs and swap transactions. In addition, the Company originates, structures and places debt instruments in the international and domestic capital markets. These instruments include asset-backed securities (primarily in Argentina) and domestic municipal securities. Retail The Company provides retail clients around the world access to over 18,000 global financial markets, including spot foreign exchange ("forex"), both financial trading and physical investment in precious metals, as well as contracts for difference (“CFDs”), which are investment products with returns linked to the performance of underlying assets. In addition, its independent wealth management business offers a comprehensive product suite to retail investors in the U.S. Global Payments The Company provides customized foreign exchange and treasury services to banks and commercial businesses, as well as charities and non-governmental organizations and government organizations. The Company provides transparent pricing and offers payments services in more than 185 countries and 140 currencies, which it believes is more than any other payments solution provider. ******** The total revenues reported combine gross revenues from physical contracts for subsidiaries that are not broker-dealers and net revenues for all other businesses. In order to reflect the way that the Company’s management views the results, the table below also reflects the segment contribution to ‘operating revenues’, which is shown on the face of the consolidated income statements and which is calculated by deducting physical commodities cost of sales from total revenues. Segment data includes the profitability measure of net contribution by segment. Net contribution is one of the key measures used by management to assess the performance of each segment and for decisions regarding the allocation of the Company’s resources. Net contribution is calculated as revenue less direct cost of sales, transaction-based clearing expenses, variable compensation, introducing broker commissions, and interest expense. Variable compensation paid to risk management consultants/traders generally represents a fixed percentage of revenues generated, and in some cases, revenues generated less transaction-based clearing expenses, base salaries and an overhead allocation. Segment data also includes segment income which is calculated as net contribution less non-variable direct expenses of the segment. These non-variable direct expenses include trader base compensation and benefits, operational employee compensation and benefits, communication and data services, business development, professional fees, bad debt expense and other direct expenses. Inter-segment revenues, expenses, receivables and payables are eliminated upon consolidation. Total revenues, operating revenues and net operating revenues shown as “Corporate Unallocated” primarily consist of interest income from its centralized corporate treasury function. In the normal course of operations, the Company operates a centralized corporate treasury function in which it may sweep excess cash from certain subsidiaries, where permitted within regulatory limitations, in exchange for a short-term interest bearing intercompany payable, or provide excess cash to subsidiaries in exchange for a short-term interest bearing intercompany receivable in lieu of the subsidiary borrowing on external credit facilities. The intercompany receivables and payables are eliminated during consolidation; however, this practice may impact reported total assets between segments. Net costs not allocated to operating segments include costs and expenses of certain shared services such as information technology, accounting and treasury, credit and risk, legal and compliance, and human resources and other activities. Information for the reportable segments is shown in accordance with the Segment Reporting Topic of the ASC as follows: Three Months Ended June 30, Nine Months Ended June 30, (in millions) 2023 2022 2023 2022 Total revenues: Commercial $ 14,444.5 $ 18,368.7 $ 42,188.7 $ 47,984.8 Institutional 381.1 209.1 1,087.1 573.2 Retail 170.7 312.1 791.5 978.0 Global Payments 53.2 44.3 158.4 127.7 Corporate Unallocated 8.6 2.9 23.9 6.9 Eliminations (10.2) (6.2) (29.1) (15.6) Total $ 15,047.9 $ 18,930.9 $ 44,220.5 $ 49,655.0 Operating revenues: Commercial $ 252.7 $ 170.2 $ 655.2 $ 506.9 Institutional 381.1 209.1 1,087.1 573.2 Retail 91.5 108.5 240.6 324.9 Global Payments 53.2 44.3 158.4 127.7 Corporate Unallocated 8.6 2.9 23.9 6.9 Eliminations (10.2) (6.2) (29.1) (15.6) Total $ 776.9 $ 528.8 $ 2,136.1 $ 1,524.0 Net operating revenues (loss): Commercial $ 213.6 $ 141.9 $ 551.4 $ 427.4 Institutional 120.3 126.4 401.4 352.1 Retail 65.1 77.9 159.8 229.5 Global Payments 51.0 41.4 151.7 120.6 Corporate Unallocated (14.1) (13.5) (47.0) (41.4) Total $ 435.9 $ 374.1 $ 1,217.3 $ 1,088.2 Net contribution: (Revenues less cost of sales of physical commodities, transaction-based clearing expenses, variable compensation, introducing broker commissions and interest expense) Commercial $ 156.9 $ 101.9 $ 413.5 $ 302.2 Institutional 81.7 74.7 265.6 214.4 Retail 60.3 71.7 147.9 212.4 Global Payments 41.9 33.6 122.1 97.6 Total $ 340.8 $ 281.9 $ 949.1 $ 826.6 Segment income: (Net contribution less non-variable direct segment costs) Commercial $ 117.0 $ 72.5 $ 302.7 $ 208.1 Institutional 45.1 47.7 162.9 129.6 Retail 17.2 26.3 17.8 95.2 Global Payments 28.6 24.6 76.8 73.0 Total $ 207.9 $ 171.1 $ 560.2 $ 505.9 Reconciliation of segment income to income before tax: Segment income $ 207.9 $ 171.1 $ 560.2 $ 505.9 Net costs not allocated to operating segments (113.4) (100.2) (336.1) (295.1) Gain on acquisition — — 23.5 — Income before tax $ 94.5 $ 70.9 $ 247.6 $ 210.8 (in millions) As of June 30, 2023 As of September 30, 2022 Total assets: Commercial $ 5,036.6 $ 5,931.0 Institutional 14,594.1 11,687.1 Retail 1,022.2 971.2 Global Payments 555.1 524.0 Corporate Unallocated 725.1 746.3 Total $ 21,933.1 $ 19,859.6

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Pay vs Performance Disclosure
Net income	$ 69.5	$ 49.1	$ 187.8	$ 154.8

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended	9 Months Ended
	Jun. 30, 2023 shares	Jun. 30, 2023 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Director Trading Arrangement [Member] | Eric Parthemore [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		Historically, the company’s executive officers and directors have entered into Rule 10b5-1 trading arrangements periodically. Now, in accordance with the new disclosure requirement set forth in Item 408(a) of Regulation S-K, the following table discloses any officer (as defined in Rule 16a-1(f) under the Securities Exchange Act of 1934, as amended) or director who adopted a contract, instruction or written plan for the sale of securities of the company intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) during the three months ended June 30, 2023. Name and Title Type of Plan Adoption Date Duration or End Date Aggregate Number of Securities to be Sold Description of Trading Arrangement Eric Parthemore - Director Rule 10b5-1 trading arrangement 6/16/2023 9/18/2024 4,500 Sales of shares
Name	Eric Parthemore
Title	Director
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	6/16/2023
Arrangement Duration	460 days
Aggregate Available	4,500	4,500
Office Trading Arrangement [Member]
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false

Basis of Presentation and Con_2

Basis of Presentation and Consolidation and Accounting Standards Adopted (Policies)	9 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying unaudited Condensed Consolidated Balance Sheet as of September 30, 2022, which has been derived from the audited consolidated balance sheet of September 30, 2022, and the unaudited interim condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Certain information and disclosures normally included in annual consolidated financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted pursuant to those rules and regulations. The Company believes that the included disclosures clearly and fairly present the information within. In management’s opinion, all adjustments, generally consisting of normal accruals, considered necessary to fairly present the condensed consolidated financial statements for the interim periods presented have been reflected as required by Rule 10-01 of Regulation S-X. Operating results for interim periods are not necessarily indicative of the results that may be expected for the related full year. These condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and related notes contained in the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2022, as filed with the SEC.
Consolidation	These condensed consolidated financial statements include the accounts of StoneX Group Inc. and all entities in which the Company has a controlling financial interest. All material intercompany transactions and balances have been eliminated in consolidation.
Fiscal Period	The Company’s fiscal year end is September 30, and its fiscal quarters end on December 31, March 31, June 30 and September 30. Unless otherwise stated, all dates refer to fiscal years and fiscal interim periods.
Use of Estimates	Preparing condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent liabilities as of the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. The most significant of these estimates and assumptions relate to fair value measurement for financial instruments, revenue recognition, valuation of inventories, and income taxes. These estimates are based on management’s best knowledge of current events and actions the Company may undertake in the future. The Company reviews all significant estimates affecting the financial statements on a recurring basis and records the effect of any necessary adjustments prior to financial statement issuance. Although these and other estimates and assumptions are based on the best available information, actual results could be materially different from these estimates. Estimates and assumptions were considered and made in context with the information reasonably available to the Company as of June 30, 2023 and through the date of this Form 10-Q.
Gain on acquisition and other gain	Gain on acquisition and other gainGain on acquisition contains the value that the Company acquired in excess of consideration paid for business combinations.
Accounting Standards	Accounting Standards The Company did not adopt any new accounting standards during the three and nine months ended June 30, 2023.
Earnings per Share	The Company presents basic and diluted earnings per share (“EPS”) using the two-class method, which requires all outstanding unvested share-based payment awards that contain rights to non-forfeitable dividends and therefore participate in undistributed earnings with common stockholders be included in computing earnings per share. Under the two-class method, net income is reduced by the amount of dividends declared in the period for each class of common stock and participating security. The remaining undistributed earnings are then allocated to common stock and participating securities, based on their respective rights to receive dividends. Restricted stock awards granted to certain employees and directors contain non-forfeitable rights to dividends at the same rate as common stock and are considered participating securities. Basic EPS has been computed by dividing net income by the weighted-average number of common shares outstanding.
Income Taxes	The income tax provision for interim periods comprises income tax on ordinary income/(loss) figures provided at the most recent estimated annual effective income tax rate, adjusted for the income tax effect of discrete items. Management uses an estimated annual effective income tax rate based on the forecasted pretax income/(loss) and statutory tax rates in the various jurisdictions in which it operates. The Company’s effective income tax rate differs from the U.S. statutory income tax rate primarily due to state and local taxes, global intangible low taxed income (“GILTI”), and differing statutory tax rates applied to the income of non-U.S. subsidiaries. The Company records the tax effect of certain discrete items, including the effects of changes in tax laws, tax rates and adjustments with respect to valuation allowances or other unusual or nonrecurring tax adjustments, in the interim period in which they occur, as an addition to, or reduction from, the income tax provision, rather than being included in the estimated effective annual income tax rate. In addition, jurisdictions with a projected loss for the year or a year-to-date loss where no income tax benefit can be recognized are excluded from the estimated annual effective income tax rate.

Earnings per Share (Tables)

Earnings per Share (Tables)	9 Months Ended
	Jun. 30, 2023
Earnings Per Share [Abstract]
Schedule of Calculation of Numerator and Denominator in Earnings Per Share	The following is a reconciliation of the numerator and denominator of the diluted earnings per share computations for the periods presented below. Three Months Ended June 30, Nine Months Ended June 30, (in millions, except share amounts) 2023 2022 2023 2022 Numerator: Net income $ 69.5 $ 49.1 $ 187.8 $ 154.8 Less: Allocation to participating securities (2.4) (1.5) (6.3) (4.5) Net income allocated to common stockholders $ 67.1 $ 47.6 $ 181.5 $ 150.3 Denominator: Weighted average number of: Common shares outstanding 20,040,167 19,634,450 19,913,424 19,529,843 Dilutive potential common shares outstanding: Share-based awards 614,133 475,542 664,891 455,055 Diluted weighted-average common shares 20,654,300 20,109,992 20,578,315 19,984,898

Assets and Liabilities, at Fa_2

Assets and Liabilities, at Fair Value (Tables)	9 Months Ended
	Jun. 30, 2023
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 June 30, 2023 and September 30, 2022 by level in the fair value hierarchy. All fair value measurements were performed on a recurring basis as of June 30, 2023 and September 30, 2022. June 30, 2023 (in millions) Level 1 Level 2 Level 3 Netting (1) Total Assets: Certificates of deposit $ 12.9 $ — $ — $ — $ 12.9 Money market mutual funds 66.7 — — — 66.7 Cash and cash equivalents 79.6 — — — 79.6 Commodities warehouse receipts 4.7 — — — 4.7 U.S. Treasury obligations 0.1 — — — 0.1 Securities and other assets segregated under federal and other regulations 4.8 — — — 4.8 U.S. Treasury obligations 3,774.5 — — — 3,774.5 To be announced and forward settling securities — 35.3 — (17.9) 17.4 Foreign government obligations 18.2 — — — 18.2 Derivatives 5,425.8 1,469.5 — (7,063.8) (168.5) Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net 9,218.5 1,504.8 — (7,081.7) 3,641.6 Receivables from clients, net - Derivatives 62.2 653.6 — (715.9) (0.1) Equity securities 375.0 11.2 — — 386.2 Corporate and municipal bonds — 233.9 — — 233.9 U.S. Treasury obligations 542.9 — — — 542.9 U.S. government agency obligations — 522.7 — — 522.7 Foreign government obligations 26.8 — — — 26.8 Agency mortgage-backed obligations — 3,043.6 — — 3,043.6 Asset-backed obligations — 144.2 — — 144.2 Derivatives 0.6 1,018.6 — (721.8) 297.4 Commodities leases — 21.2 — — 21.2 Commodities warehouse receipts 36.9 — — — 36.9 Exchange firm common stock 11.1 — — — 11.1 Cash flow hedges — 7.5 — — 7.5 Mutual funds and other 30.3 — 0.6 — 30.9 Financial instruments owned 1,023.6 5,002.9 0.6 (721.8) 5,305.3 Physical commodities inventory 117.3 157.9 — — 275.2 Total assets at fair value $ 10,506.0 $ 7,319.2 $ 0.6 $ (8,519.4) $ 9,306.4 Liabilities: Accounts payable and other accrued liabilities $ — $ — $ 1.4 $ — $ 1.4 Payables to clients - Derivatives 5,359.4 276.8 — (5,932.7) (296.5) TBA and forward settling securities — 24.0 — (17.7) 6.3 Derivatives 115.9 1,725.7 — (1,844.7) (3.1) Payable to broker-dealers, clearing organizations and counterparties 115.9 1,749.7 — (1,862.4) 3.2 Equity securities 297.0 4.8 — — 301.8 Foreign government obligations 20.7 — — — 20.7 Corporate and municipal bonds — 120.8 — — 120.8 U.S. Treasury obligations 1,805.1 — — — 1,805.1 U.S. government agency obligations — 29.2 — — 29.2 Agency mortgage-backed obligations — 6.2 — — 6.2 Derivatives 4.8 943.6 — (579.4) 369.0 Cash flow hedges — 37.6 — — 37.6 Other — 4.5 1.3 — 5.8 Financial instruments sold, not yet purchased 2,127.6 1,146.7 1.3 (579.4) 2,696.2 Total liabilities at fair value $ 7,602.9 $ 3,173.2 $ 2.7 $ (8,374.5) $ 2,404.3 (1) Represents cash collateral and the impact of netting across at each level of the fair value hierarchy. September 30, 2022 (in millions) Level 1 Level 2 Level 3 Netting (1) Total Assets: Certificates of deposit $ 4.0 $ — $ — $ — $ 4.0 Money market mutual funds 39.5 — — — 39.5 Cash and cash equivalents 43.5 — — — 43.5 Commodities warehouse receipts 19.7 — — — 19.7 U.S. Treasury obligations 786.0 — — — 786.0 Securities and other assets segregated under federal and other regulations 805.7 — — — 805.7 U.S. Treasury obligations 4,258.5 — — — 4,258.5 TBA and forward settling securities — 207.6 — (91.4) 116.2 Foreign government obligations 14.4 — — — 14.4 Derivatives 7,714.4 461.4 — (9,747.7) (1,571.9) Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net 11,987.3 669.0 — (9,839.1) 2,817.2 Receivables from clients, net - Derivatives 67.2 511.6 (579.3) (0.5) Equity securities 367.9 11.8 — — 379.7 Corporate and municipal bonds — 156.8 — — 156.8 U.S. Treasury obligations 347.6 — — — 347.6 U.S. government agency obligations — 343.0 — — 343.0 Foreign government obligations 4.8 — — — 4.8 Agency mortgage-backed obligations — 2,588.7 — — 2,588.7 Asset-backed obligations — 70.7 — — 70.7 Derivatives 0.7 694.3 — (502.4) 192.6 Commodities leases — 26.4 — — 26.4 Commodities warehouse receipts 24.9 — — — 24.9 Exchange firm common stock 10.6 — — — 10.6 Mutual funds and other 17.4 4.1 — — 21.5 Financial instruments owned 773.9 3,895.8 — (502.4) 4,167.3 Physical commodities inventory 136.3 223.5 — — 359.8 Total assets at fair value $ 13,813.9 $ 5,299.9 $ — $ (10,920.8) $ 8,193.0 Liabilities: Payables to clients - Derivatives 7,722.5 175.4 (9,290.3) (1,392.4) TBA and forward settling securities — 154.9 — (96.9) 58.0 Derivatives 58.7 590.6 — (651.5) (2.2) Payable to broker-dealers, clearing organizations and counterparties 58.7 745.5 — (748.4) 55.8 Equity securities 299.9 5.7 — — 305.6 Foreign government obligations 0.5 — — — 0.5 Corporate and municipal bonds — 63.2 — — 63.2 U.S. Treasury obligations 1,686.5 — — — 1,686.5 U.S. government agency obligations — 24.3 — — 24.3 Agency mortgage-backed obligations — 5.4 — — 5.4 Derivatives — 779.7 — (466.3) 313.4 Cash flow hedges — 70.6 — — 70.6 Other — 0.1 — — 0.1 Financial instruments sold, not yet purchased 1,986.9 949.0 — (466.3) 2,469.6 Total liabilities at fair value $ 9,768.1 $ 1,869.9 $ — $ (10,505.0) $ 1,133.0

Financial Instruments with Of_2

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk (Tables)	9 Months Ended
	Jun. 30, 2023
Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk [Abstract]
Schedule of Derivative Instruments	Listed below are the fair values of the Company’s derivative assets and liabilities as of June 30, 2023 and September 30, 2022. Assets represent net unrealized gains and liabilities represent net unrealized losses. June 30, 2023 September 30, 2022 (in millions) Assets (1) Liabilities (1) Assets (1) Liabilities (1) Derivative contracts not accounted for as hedges: Exchange-traded commodity derivatives $ 1,644.0 $ 1,630.6 $ 4,520.4 $ 4,519.3 OTC commodity derivatives 1,865.3 1,790.4 756.9 695.6 Exchange-traded foreign exchange derivatives 2.4 2.4 25.6 25.7 OTC foreign exchange derivatives 756.3 726.5 577.1 549.3 Exchange-traded interest rate derivatives 1,835.3 1,840.2 2,626.8 2,626.7 OTC interest rate derivatives 343.4 343.4 168.9 205.1 Exchange-traded equity index derivatives 2,006.9 2,006.9 609.5 609.5 OTC equity and indices derivatives 176.7 85.8 164.4 95.7 TBA and forward settling securities 35.3 24.0 207.6 154.9 Subtotal 8,665.6 8,450.2 9,657.2 9,481.8 Derivative contracts designated as hedging instruments: Interest rate contracts — 37.6 — 48.8 Foreign currency forward contracts 7.5 — — 21.8 Subtotal 7.5 37.6 — 70.6 Gross fair value of derivative contracts $ 8,673.1 $ 8,487.8 $ 9,657.2 $ 9,552.4 Impact of netting and collateral (8,519.4) (8,374.5) (10,920.8) (10,505.0) Total fair value included in Deposits with and receivables from broker-dealers, clearing organizations, and counterparties, net $ (151.1) $ (1,455.7) Total fair value included in Receivables from clients, net $ (0.1) $ (0.5) Total fair value included in Financial instruments owned, at fair value $ 304.9 $ 192.6 Total fair value included in Payables to clients $ (296.5) $ (1,392.4) Total fair value included in Payables to broker-dealers, clearing organizations and counterparties $ 3.2 $ 55.8 Total fair value included in Financial instruments sold, not yet purchased, at fair value $ 406.6 $ 384.0 (1) As of June 30, 2023 and September 30, 2022, the Company’s derivative contract volume for open positions was approximately 12.8 million and 13.3 million contracts, respectively.
Schedule of Fair Value of Derivative Instruments Designated for Hedging	The fair values of derivative instruments designated for hedging held as of June 30, 2023 and September 30, 2022 are as follow: June 30, 2023 September 30, 2022 (in millions) Balance Sheet Location Fair Value Fair Value Asset Derivatives Derivatives designated as hedging instruments: Foreign currency forward contracts Financial instruments owned, net $ 7.5 $ — Total derivatives designated as hedging instruments $ 7.5 $ — Derivative assets expected to be released from Other comprehensive income into current earnings: Foreign currency forward contracts $ 5.2 $ — Total expected to be released from Other comprehensive income into earnings $ 5.2 $ — Liability Derivatives Derivatives designated as hedging instruments: Interest rate contracts Financial instruments sold, not yet purchased $ 37.6 $ 48.8 Foreign currency forward contracts Financial instruments sold, not yet purchased — 21.8 Total derivatives designated as hedging instruments $ 37.6 $ 70.6 Derivative liabilities expected to be released from Other comprehensive income into current earnings: Interest rate contracts $ 23.2 $ 9.7 Foreign currency forward contracts — 8.9 Total expected to be released from Other comprehensive income into earnings $ 23.2 $ 18.6
Schedule of Notional Amounts of Outstanding Derivative Positions	The notional values of derivative instruments designated for hedging held as of June 30, 2023 and September 30, 2022 are as follow: June 30, 2023 September 30, 2022 (in millions) Notional Value Notional Value Derivatives designated as hedging instruments: Interest rate contracts $ 2,000.0 $ 1,500.0 Foreign currency forward contracts: Foreign currency forward contracts to purchase Polish Zloty: Local currency zł 156.1 zł — USD $ 33.7 $ — Foreign currency forward contracts to purchase British Pound Sterling: Local currency £ 168.0 £ 168.0 USD $ 207.2 $ 207.3
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance	The Condensed Consolidated Income Statement effects of derivative instruments designated for hedging held for the three and nine months ended June 30, 2023 and 2022 are as follows: (in millions) Income Statement Location Three Months Ended June 30, 2023 Nine Months Ended June 30, 2023 Total amounts in income related to hedges Interest rate contracts Interest income $ (14.3) $ (31.3) Foreign currency forward contracts Compensation and benefits 1.6 2.1 Total derivatives designated as hedging instruments $ (12.7) $ (29.2) Loss on cash flow hedging relationships: Amount of loss reclassified from accumulated other comprehensive income into income $ (12.7) $ (29.2) Amount of gain reclassified from accumulated other comprehensive income into income as a result of a forecasted transaction that is no longer probable of occurring $ — $ — (in millions) Income Statement Location Three Months Ended June 30, 2022 Nine Months Ended June 30, 2022 Total amounts in income related to hedges Interest rate contracts Interest Income $ 0.1 $ 1.8 Total derivatives designated as hedging instruments $ 0.1 $ 1.8 Gain on cash flow hedging relationships: Amount of gain reclassified from accumulated other comprehensive income into income $ 0.1 $ 1.8 Amount of gain reclassified from accumulated other comprehensive income into income as a result of a forecasted transaction that is no longer probable of occurring $ — $ — The following table sets forth the Company’s net gains/(losses) related to derivative financial instruments for the three and nine months ended June 30, 2023 and 2022 in accordance with the Derivatives and Hedging Topic of the ASC. The net gains/(losses) set forth below are included in Principal gains, net and Cost of sales of physical commodities in the Condensed Consolidated Income Statements. Three Months Ended June 30, Nine Months Ended June 30, (in millions) 2023 2022 2023 2022 Commodities $ 105.3 $ 69.9 $ 307.3 $ 218.8 Foreign exchange (10.8) 47.5 (34.8) 127.2 Interest rate, equities, and indices 51.6 29.5 85.5 82.3 TBA and forward settling securities 42.0 66.2 4.9 158.2 Net gains from derivative contracts $ 188.1 $ 213.1 $ 362.9 $ 586.5
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income	The accumulated other comprehensive income effects of derivative instruments designated for hedging held for three and nine months ended June 30, 2023 and 2022 are as follow: Three Months Ended June 30, 2023 (in millions) Amount of Gain/(Loss) Recognized in Other Comprehensive Income on Derivatives, net of tax Location of amount Reclassified from Accumulated Other Comprehensive Income into Income Amount Reclassified from Accumulated Other Comprehensive Income into Income Derivatives in Cash Flow Hedging Relationships: Interest rate contracts $ (0.7) Interest Income $ (14.3) Foreign currency forward contracts 3.3 Compensation and benefits 1.6 Total $ 2.6 $ (12.7) Nine Months Ended June 30, 2023 (in millions) Amount of Gain Recognized in Other Comprehensive Income on Derivatives, net of tax Location of Gain Reclassified from Accumulated Other Comprehensive Income into Income Amount Reclassified from Accumulated Other Comprehensive Income into Income Derivatives in Cash Flow Hedging Relationships: Interest rate contracts $ 8.5 Interest Income $ (31.3) Foreign currency forward contracts 23.1 Compensation and benefits 2.1 Total $ 31.6 $ (29.2) Three Months Ended June 30, 2022 (in millions) Amount of Gain/(loss) Recognized in Other Comprehensive Income on Derivatives, net of tax Location of amount Reclassified from Accumulated Other Comprehensive Income into Income Amount Reclassified from Accumulated Other Comprehensive Income into Income Derivatives in Cash Flow Hedging Relationships: Interest rate contracts $ 6.8 Interest Income $ 0.1 Total $ 6.8 $ 0.1 Nine Months Ended June 30, 2022 (in millions) Amount of Loss Recognized in Other Comprehensive Income on Derivatives, net of tax Location of Gain Reclassified from Accumulated Other Comprehensive Income into Income Amount of Gain Reclassified from Accumulated Other Comprehensive Income into Income Derivatives in Cash Flow Hedging Relationships: Interest rate contracts $ 25.0 Interest Income $ 1.8 Total $ 25.0 $ 1.8

Allowance for Doubtful Accoun_2

Allowance for Doubtful Accounts (Tables)	9 Months Ended
	Jun. 30, 2023
Receivables [Abstract]
Schedule of Financing Receivable, Allowance for Credit Loss	Activity in the allowance for doubtful accounts for the nine months ended June 30, 2023 was as follows: (in millions) Balance as of September 30, 2022 $ 47.8 Provision for bad debts 6.9 Allowance charge-offs (1.4) Balance as of June 30, 2023 $ 53.3

Physical Commodities Inventory

Physical Commodities Inventory (Tables)	9 Months Ended
	Jun. 30, 2023
Inventory Disclosure [Abstract]
Schedule of Inventory	The Company’s inventories consist of finished physical commodities as shown below. (in millions) June 30, September 30, Physical Ag & Energy (1) $ 157.9 $ 223.6 Precious metals - held by broker-dealer subsidiary 117.3 136.3 Precious metals - held by non-broker-dealer subsidiaries 169.5 153.6 Physical commodities inventory, net $ 444.7 $ 513.5 (1) Physical Ag & Energy consists of agricultural commodity inventories, including corn, soybeans, wheat, dried distillers grain, canola, sorghum, coffee, cocoa, cotton, and others. Agricultural inventories have reliable, readily determinable and realizable market prices, have relatively insignificant costs of disposal and are available for immediate delivery. Physical Ag & Energy also includes energy related inventories, including primarily propane, gasoline, and kerosene. The Company records changes to these values in Cost of sales of physical commodities on the Condensed Consolidated Income Statements.

Goodwill (Tables)

Goodwill (Tables)	9 Months Ended
	Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	Goodwill allocated to the Company’s operating segments is as follows: (in millions) June 30, September 30, Commercial $ 33.8 $ 32.6 Institutional 9.8 9.8 Retail 5.8 5.8 Global Payments 10.0 10.0 Total Goodwill $ 59.4 $ 58.2

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
	Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite and Indefinite-Lived Intangible Assets	The gross and net carrying values of intangible assets as of the balance sheet dates, by major intangible asset class are as follows (in millions): June 30, 2023 September 30, 2022 Gross Amount Accumulated Net Amount Gross Amount Accumulated Net Amount Intangible assets subject to amortization Trade/domain names $ 4.1 $ (2.2) $ 1.9 $ 3.7 $ (1.6) $ 2.1 Software programs/platforms 28.6 (26.1) 2.5 28.3 (19.4) 8.9 Client and supplier base 38.3 (22.6) 15.7 29.5 (18.0) 11.5 Total intangible assets subject to amortization 71.0 (50.9) 20.1 61.5 (39.0) 22.5 Intangible assets not subject to amortization Website domains 2.0 — 2.0 1.8 — 1.8 Business licenses 3.7 — 3.7 3.7 — 3.7 Total intangible assets not subject to amortization 5.7 — 5.7 5.5 — 5.5 Total intangible assets $ 76.7 $ (50.9) $ 25.8 $ 67.0 $ (39.0) $ 28.0
Schedule of Expected Amortization Expense	As of June 30, 2023, the estimated future amortization expense was as follows: (in millions) Fiscal 2023 (remaining three months) $ 2.5 Fiscal 2024 6.8 Fiscal 2025 3.6 Fiscal 2026 2.8 Fiscal 2027 and thereafter 4.4 Total intangible assets subject to amortization $ 20.1

Credit Facilities (Tables)

Credit Facilities (Tables)	9 Months Ended
	Jun. 30, 2023
Debt Disclosure [Abstract]
Schedule of Debt	The following table sets forth a listing of credit facilities, the current committed amounts as of the report date on the facilities, and outstanding borrowings on the facilities, as well as indebtedness on a promissory note and the Notes as of the periods indicated: (in millions) Amounts Outstanding Borrower Security Renewal/Expiration Date Total Commitment June 30, 2023 September 30, Committed Credit Facilities Senior StoneX Group Inc. Committed Credit Facility - Revolving Line of Credit (1) April 21, 2026 $ 500.0 $ 230.0 (5) $ 260.0 StoneX Financial Inc. None December 11, 2023 180.0 — (5) — StoneX Commodity Solutions LLC Certain commodities assets July 28, 2024 400.0 162.1 (5) 217.0 StoneX Financial Ltd. None October 14, 2023 75.0 — (5) — $ 1,155.0 $ 392.1 $ 477.0 Uncommitted Credit Facilities Various 22.9 (5) — Note Payable to Bank Certain equipment 7.6 (5) 8.1 Senior Secured Notes (2) 341.3 (3),(4) 339.1 Total outstanding borrowings $ 763.9 $ 824.2 (1) The StoneX Group Inc. committed credit facility is secured by substantially all of the assets of StoneX Group Inc. and certain subsidiaries identified in the credit facility agreement as obligors, and pledged equity of certain subsidiaries identified in the credit facility as limited guarantors. The maturity date remains April 21, 2025 for one lender representing $42.5 million of the facility commitment. (2) The Notes and the related guarantees are secured by liens on substantially all of the Company’s and the guarantors’ assets, subject to certain customary and other exceptions and permitted liens. The liens on the assets that secure the Notes and the related guarantees are contractually subordinated to the liens on the assets that secure the Company’s and the guarantors’ existing and future first lien secured indebtedness, including indebtedness under the Company’s senior committed credit facility. (3) Amounts outstanding under the Notes are reported net of unamortized original issue discount of $6.6 million and $8.8 million, in the respective periods presented. (4) Included in Senior secured borrowings, net on the Condensed Consolidated Balance Sheets . (5) Included in Lenders under loans on the Condensed Consolidated Balance Sheets .

Securities and Commodity Fina_2

Securities and Commodity Financing Transactions (Tables)	9 Months Ended
	Jun. 30, 2023
Broker-Dealer [Abstract]
Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets	The following tables set forth the carrying value of repurchase agreements, and securities lending agreements by remaining contractual maturity (in millions): June 30, 2023 Overnight and Open Less than 30 Days 30-90 Days Over 90 Days Total Securities sold under agreements to repurchase $ 11,141.4 $ 557.9 $ 69.1 $ 45.0 $ 11,813.4 Securities loaned 1,093.3 — — — 1,093.3 Gross amount of secured financing $ 12,234.7 $ 557.9 $ 69.1 $ 45.0 $ 12,906.7 September 30, 2022 Overnight and Open Less than 30 Days 30-90 Days Over 90 Days Total Securities sold under agreements to repurchase $ 3,664.7 $ 2,279.1 $ 186.3 $ 3.4 $ 6,133.5 Securities loaned 1,189.5 — — — 1,189.5 Gross amount of secured financing $ 4,854.2 $ 2,279.1 $ 186.3 $ 3.4 $ 7,323.0
Schedule of Financial Instruments Owned and Pledged as Collateral	The following table sets forth the carrying value of repurchase agreements and securities lending agreements by class of collateral pledged (in millions): Securities sold under agreements to repurchase June 30, 2023 September 30, 2022 U.S. Treasury obligations $ 6,169.3 $ 1,311.0 U.S. government agency obligations 676.5 604.1 Asset-backed obligations 122.6 178.0 Agency mortgage-backed obligations 4,425.9 3,762.5 Foreign government obligations 130.6 97.2 Corporate bonds 288.5 180.7 Total securities sold under agreement to repurchase $ 11,813.4 $ 6,133.5 Securities loaned Equity securities $ 1,093.3 $ 1,189.5 Total securities loaned 1,093.3 1,189.5 Gross amount of secured financing $ 12,906.7 $ 7,323.0 The following tables provide the netting of securities purchased under agreements to resell, securities sold under agreements to repurchase, securities borrowed and securities loaned as of the periods indicated (in millions): June 30, 2023 Offsetting of collateralized transactions: Gross Amounts Recognized Amounts Offset in the Condensed Consolidated Balance Sheet Net Amounts Presented in the Condensed Consolidated Balance Sheet Securities purchased under agreements to resell $ 9,425.9 $ (6,783.9) $ 2,642.0 Securities borrowed $ 1,094.3 $ — $ 1,094.3 Securities sold under agreements to repurchase $ 11,813.4 $ (6,783.9) $ 5,029.5 Securities loaned $ 1,093.3 $ — $ 1,093.3 September 30, 2022 Offsetting of collateralized transactions: Gross Amounts Recognized Amounts Offset in the Condensed Consolidated Balance Sheet Net Amounts Presented in the Condensed Consolidated Balance Sheet Securities purchased under agreements to resell $ 4,609.9 $ (2,937.9) $ 1,672.0 Securities borrowed $ 1,209.8 $ — $ 1,209.8 Securities sold under agreements to repurchase $ 6,133.5 $ (2,937.9) $ 3,195.6 Securities loaned $ 1,189.5 $ — $ 1,189.5
Schedule of Carrying Value of Collateral Pledged, Received and Repledged	The following table sets forth the carrying value of collateral pledged, received and repledged (in millions): June 30, 2023 September 30, 2022 Securities pledged or repledged to cover collateral requirements for tri-party arrangements $ 5,039.7 $ 3,787.8 Securities received as collateral that may be repledged $ 10,636.0 $ 5,836.1 Securities received as collateral that may be repledged covering securities sold short $ 2,149.1 $ 1,615.3 Repledged securities borrowed and client securities held under custodial clearing arrangements to collateralize securities loaned agreements $ 1,084.3 $ 1,146.0

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Loss, Net (Tables)	9 Months Ended
	Jun. 30, 2023
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Loss	The following table summarizes the changes in accumulated other comprehensive loss, net for the nine months ended June 30, 2023. (in millions) Foreign Currency Translation Adjustment Pension Benefits Adjustment Cash Flow Hedge Accumulated Other Comprehensive Loss, net Balances as of September 30, 2022 $ (34.4) $ (2.7) $ (53.5) $ (90.6) Other comprehensive income, net of tax 15.5 — 31.6 47.1 Balances as of June 30, 2023 $ (18.9) $ (2.7) $ (21.9) $ (43.5)

Revenue from Contracts with C_2

Revenue from Contracts with Clients (Tables)	9 Months Ended
	Jun. 30, 2023
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregation of Revenue	Three Months Ended June 30, Nine Months Ended June 30, (in millions) 2023 2022 2023 2022 Revenues from contracts with clients as a percentage of total revenues 6.5 % 4.5 % 6.4 % 5.5 % The following table represents a disaggregation of the Company’s total revenues separated between revenues from contracts with clients and other sources of revenue for the periods indicated. Three Months Ended June 30, Nine Months Ended June 30, (in millions) 2023 2022 2023 2022 Revenues from contracts with clients: Commission and clearing fees: Sales-based: Exchange-traded futures and options $ 57.6 $ 53.1 $ 161.6 $ 155.4 OTC derivative brokerage 2.0 4.0 10.1 13.3 Equities and fixed income 13.6 15.4 44.6 47.1 Mutual funds 0.7 1.0 2.2 3.4 Insurance and annuity products 2.0 2.2 6.5 7.4 Other 2.0 0.6 4.2 2.3 Total sales-based commission 77.9 76.3 229.2 228.9 Trailing: Mutual funds 3.1 3.4 9.2 10.9 Insurance and annuity products 3.5 3.9 10.5 12.5 Total trailing commission 6.6 7.3 19.7 23.4 Clearing fees 38.6 38.8 114.6 115.8 Trade conversion fees 1.7 3.0 6.1 9.0 Other 2.0 1.5 5.9 4.5 Total commission and clearing fees 126.8 126.9 375.5 381.6 Consulting, management, and account fees: Underwriting fees 0.2 0.1 0.5 0.4 Asset management fees 11.5 11.5 33.3 33.5 Advisory and consulting fees 8.4 8.2 26.1 23.2 Sweep program fees 12.3 2.5 36.6 3.5 Client account fees 4.0 3.8 11.5 11.8 Other 2.8 1.6 11.7 4.8 Total consulting, management, and account fees 39.2 27.7 119.7 77.2 Sales of physical commodities: Precious metals sales 814.7 696.0 2,349.7 2,283.3 Total revenues from contracts with clients $ 980.7 $ 850.6 $ 2,844.9 $ 2,742.1 Method of revenue recognition: Point-in-time $ 941.9 $ 821.1 $ 2,729.2 $ 2,658.5 Time elapsed 38.8 29.5 115.7 83.6 Total revenues from contracts with clients 980.7 850.6 2,844.9 2,742.1 Other sources of revenues Physical precious metals trading 12,513.4 16,808.1 36,695.5 43,334.7 Physical agricultural and energy product trading 991.1 926.9 3,183.6 2,596.1 Principal gains, net 300.0 295.2 810.8 869.8 Interest income 262.7 50.1 685.7 112.3 Total revenues $ 15,047.9 $ 18,930.9 $ 44,220.5 $ 49,655.0 Total revenues by primary geographic region: United States $ 1,428.9 $ 1,278.3 $ 4,463.6 $ 3,607.6 Europe 1,014.8 813.1 2,841.8 2,631.3 South America 65.9 21.7 184.6 63.0 Middle East and Asia 12,534.9 16,814.7 36,721.2 43,345.4 Other 3.4 3.1 9.3 7.7 Total revenues $ 15,047.9 $ 18,930.9 $ 44,220.5 $ 49,655.0 Operating revenues by primary geographic region: United States $ 559.6 $ 354.7 $ 1,588.0 $ 1,023.3 Europe 145.1 125.8 352.1 364.8 South America 34.3 21.7 97.8 63.0 Middle East and Asia 34.4 23.5 88.9 65.3 Other 3.5 3.1 9.3 7.6 Total operating revenues $ 776.9 $ 528.8 $ 2,136.1 $ 1,524.0
Schedule of Income and Expense	The following table indicates the relevant income and expense: Three Months Ended June 30, Nine Months Ended June 30, (in millions) 2023 2022 2023 2022 Dividend income on long equity positions $ 10.2 $ 31.6 $ 27.5 $ 119.1 Dividend expense on short equity positions 11.6 32.0 28.8 109.9 Dividend (loss)/income, net reported within Principal Gains, net $ (1.4) $ (0.4) $ (1.3) $ 9.2

Other Expenses (Tables)

Other Expenses (Tables)	9 Months Ended
	Jun. 30, 2023
Other Expenses [Abstract]
Schedule of Other Operating Cost and Expense, by Component	Other expenses consisted of the following, for the periods indicated. Three Months Ended June 30, Nine Months Ended June 30, (in millions) 2023 2022 2023 2022 Non-income taxes $ 4.1 $ 4.6 $ 11.0 $ 13.7 Insurance 2.5 2.8 8.2 8.2 Employee related expenses 2.1 2.9 8.0 6.9 Other direct business expenses 3.0 2.5 11.1 6.9 Membership fees 0.9 0.6 2.8 2.4 Director and public company expenses 0.5 0.3 1.5 1.3 Office expenses 0.5 0.4 1.4 1.2 Other expenses 1.8 1.7 6.1 4.0 Total other expenses $ 15.4 $ 15.8 $ 50.1 $ 44.6

Regulatory Capital Requiremen_2

Regulatory Capital Requirements (Tables)	9 Months Ended
	Jun. 30, 2023
Capital and Other Regulatory Requirements [Abstract]
Schedule of Subsidiaries with Minimum Regulatory Requirements	The following table details those subsidiaries with minimum regulatory requirements in excess of $10.0 million along with the actual balance maintained as of that date. (in millions) As of June 30, 2023 Subsidiary Regulatory Authority Actual Minimum StoneX Financial Inc. SEC and CFTC $ 364.4 $ 214.1 StoneX Financial Ltd. Financial Conduct Authority (“FCA”) $ 492.6 $ 358.0 Gain Capital Group, LLC CFTC and NFA $ 50.4 $ 29.3 StoneX Financial Pte. Ltd. Monetary Authority of Singapore ("MAS") $ 70.9 $ 22.1 StoneX Markets LLC CFTC and NFA $ 221.0 $ 123.7

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Jun. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Schedule of Business Acquisitions	(in millions) Fair Value Cash and cash equivalents $ 8.2 Deposits with and receivables from broker-dealers, clearing organizations, and counterparties 7.7 Receivables from clients, net 51.9 Financial instruments owned, at fair value 45.7 Deferred income taxes, net (3.3) Property and equipment, net 0.1 Physical commodities inventory, net 22.5 Other assets 6.7 Total fair value of tangible assets acquired 139.5 Accounts payable and other accrued liabilities 40.0 Financial instruments sold, not yet purchased, at fair value 28.3 Payables to lenders under loans 10.1 Payable to broker-dealers, clearing organizations, and counterparties 0.4 Payable to clients 2.6 Income taxes payable 0.8 Total fair value of tangible liabilities assumed 82.2 Fair value of tangible net assets acquired $ 57.3 Identifiable intangible assets acquired Client relationships $ 4.7 Supplier relationships 3.7 Trade name 0.4 Non-compete 0.1 Total fair value of intangible assets acquired 8.9 Fair value of identifiable net assets acquired 66.2 Total merger consideration 42.7 Gain on acquisition $ 23.5
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	(in millions) Fair Value Cash and cash equivalents $ 8.2 Deposits with and receivables from broker-dealers, clearing organizations, and counterparties 7.7 Receivables from clients, net 51.9 Financial instruments owned, at fair value 45.7 Deferred income taxes, net (3.3) Property and equipment, net 0.1 Physical commodities inventory, net 22.5 Other assets 6.7 Total fair value of tangible assets acquired 139.5 Accounts payable and other accrued liabilities 40.0 Financial instruments sold, not yet purchased, at fair value 28.3 Payables to lenders under loans 10.1 Payable to broker-dealers, clearing organizations, and counterparties 0.4 Payable to clients 2.6 Income taxes payable 0.8 Total fair value of tangible liabilities assumed 82.2 Fair value of tangible net assets acquired $ 57.3 Identifiable intangible assets acquired Client relationships $ 4.7 Supplier relationships 3.7 Trade name 0.4 Non-compete 0.1 Total fair value of intangible assets acquired 8.9 Fair value of identifiable net assets acquired 66.2 Total merger consideration 42.7 Gain on acquisition $ 23.5

Segment Analysis (Tables)

Segment Analysis (Tables)	9 Months Ended
	Jun. 30, 2023
Segment Reporting [Abstract]
Schedule of Segment Reporting Information	Information for the reportable segments is shown in accordance with the Segment Reporting Topic of the ASC as follows: Three Months Ended June 30, Nine Months Ended June 30, (in millions) 2023 2022 2023 2022 Total revenues: Commercial $ 14,444.5 $ 18,368.7 $ 42,188.7 $ 47,984.8 Institutional 381.1 209.1 1,087.1 573.2 Retail 170.7 312.1 791.5 978.0 Global Payments 53.2 44.3 158.4 127.7 Corporate Unallocated 8.6 2.9 23.9 6.9 Eliminations (10.2) (6.2) (29.1) (15.6) Total $ 15,047.9 $ 18,930.9 $ 44,220.5 $ 49,655.0 Operating revenues: Commercial $ 252.7 $ 170.2 $ 655.2 $ 506.9 Institutional 381.1 209.1 1,087.1 573.2 Retail 91.5 108.5 240.6 324.9 Global Payments 53.2 44.3 158.4 127.7 Corporate Unallocated 8.6 2.9 23.9 6.9 Eliminations (10.2) (6.2) (29.1) (15.6) Total $ 776.9 $ 528.8 $ 2,136.1 $ 1,524.0 Net operating revenues (loss): Commercial $ 213.6 $ 141.9 $ 551.4 $ 427.4 Institutional 120.3 126.4 401.4 352.1 Retail 65.1 77.9 159.8 229.5 Global Payments 51.0 41.4 151.7 120.6 Corporate Unallocated (14.1) (13.5) (47.0) (41.4) Total $ 435.9 $ 374.1 $ 1,217.3 $ 1,088.2 Net contribution: (Revenues less cost of sales of physical commodities, transaction-based clearing expenses, variable compensation, introducing broker commissions and interest expense) Commercial $ 156.9 $ 101.9 $ 413.5 $ 302.2 Institutional 81.7 74.7 265.6 214.4 Retail 60.3 71.7 147.9 212.4 Global Payments 41.9 33.6 122.1 97.6 Total $ 340.8 $ 281.9 $ 949.1 $ 826.6 Segment income: (Net contribution less non-variable direct segment costs) Commercial $ 117.0 $ 72.5 $ 302.7 $ 208.1 Institutional 45.1 47.7 162.9 129.6 Retail 17.2 26.3 17.8 95.2 Global Payments 28.6 24.6 76.8 73.0 Total $ 207.9 $ 171.1 $ 560.2 $ 505.9 Reconciliation of segment income to income before tax: Segment income $ 207.9 $ 171.1 $ 560.2 $ 505.9 Net costs not allocated to operating segments (113.4) (100.2) (336.1) (295.1) Gain on acquisition — — 23.5 — Income before tax $ 94.5 $ 70.9 $ 247.6 $ 210.8 (in millions) As of June 30, 2023 As of September 30, 2022 Total assets: Commercial $ 5,036.6 $ 5,931.0 Institutional 14,594.1 11,687.1 Retail 1,022.2 971.2 Global Payments 555.1 524.0 Corporate Unallocated 725.1 746.3 Total $ 21,933.1 $ 19,859.6

Basis of Presentation and Con_3

Basis of Presentation and Consolidation and Accounting Standards Adopted (Details)	Jun. 30, 2023 client country
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of countries in which entity operates | country	180
Number of commercial and institutional clients | client	54,000
Number retail clients | client	400,000
Retail Segment
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of countries in which entity operates | country	180

Earnings per Share - EPS Reconc

Earnings per Share - EPS Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Net income	$ 69.5	$ 49.1	$ 187.8	$ 154.8
Less: Allocation to participating securities	(2.4)	(1.5)	(6.3)	(4.5)
Net income allocated to common stockholders	$ 67.1	$ 47.6	$ 181.5	$ 150.3
Denominator:
Common shares outstanding (in shares)	20,040,167	19,634,450	19,913,424	19,529,843
Dilutive potential common shares outstanding:
Share-based awards (in shares)	614,133	475,542	664,891	455,055
Diluted weighted - average common shares (in shares)	20,654,300	20,109,992	20,578,315	19,984,898

Earnings per Share - Narrative

Earnings per Share - Narrative (Details) - shares	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Antidilutive securities (in shares)	288,745	443,275	249,877	463,991

Assets and Liabilities, at Fa_3

Assets and Liabilities, at Fair Value - Narrative (Details) - USD ($)	Jun. 30, 2023	Sep. 30, 2022	Jun. 11, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts payable and other accrued liabilities	$ 476,100,000	$ 400,600,000
Carrying value	341,300,000	339,100,000
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt, fair value	$ 351,800,000
Senior Secured Notes due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, interest rate, stated percentage	8.625%		8.625%
Contingent Consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accounts payable and other accrued liabilities	$ 0	$ 0

Assets and Liabilities, at Fa_4

Assets and Liabilities, at Fair Value - Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 4.8	$ 805.7
Securities and other assets segregated under federal and other regulations	2,492.4	3,267.2
Financial instruments owned	5,305.3	4,167.3
Physical commodities inventory	444.7	513.5
Accounts payable and other accrued liabilities	476.1	400.6
Financial instruments sold, not yet purchased	2,696.2	2,469.6
Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	79.6	43.5
Securities and other assets segregated under federal and other regulations	4.8	805.7
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	3,641.6	2,817.2
Receivables from clients, net - Derivatives	(0.1)	(0.5)
Financial instruments owned	5,305.3	4,167.3
Total assets at fair value	9,306.4	8,193
Accounts payable and other accrued liabilities	1.4
Payables to clients - Derivatives	(296.5)	(1,392.4)
Total liabilities at fair value	2,404.3	1,133
Fair Value, Recurring | TBA and forward settling securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	6.3	58
Fair Value, Recurring | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	(3.1)	(2.2)
Fair Value, Recurring | Payable to broker-dealers, clearing organizations and counterparties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	3.2	55.8
Fair Value, Recurring | Physical commodities inventory
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Physical commodities inventory	275.2	359.8
Fair Value, Recurring | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	386.2	379.7
Financial instruments sold, not yet purchased	301.8	305.6
Fair Value, Recurring | Corporate and municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	233.9	156.8
Financial instruments sold, not yet purchased	120.8	63.2
Fair Value, Recurring | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	542.9	347.6
Financial instruments sold, not yet purchased	1,805.1	1,686.5
Fair Value, Recurring | U.S. government agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	522.7	343
Financial instruments sold, not yet purchased	29.2	24.3
Fair Value, Recurring | Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	26.8	4.8
Financial instruments sold, not yet purchased	20.7	0.5
Fair Value, Recurring | Agency mortgage-backed obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	3,043.6	2,588.7
Financial instruments sold, not yet purchased	6.2	5.4
Fair Value, Recurring | Asset-backed obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	144.2	70.7
Fair Value, Recurring | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	297.4	192.6
Financial instruments sold, not yet purchased	369	313.4
Fair Value, Recurring | Commodities leases
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	21.2	26.4
Fair Value, Recurring | Commodities warehouse receipts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	36.9	24.9
Fair Value, Recurring | Exchange firm common stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	11.1	10.6
Fair Value, Recurring | Cash flow hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	7.5
Financial instruments sold, not yet purchased	37.6	70.6
Fair Value, Recurring | Mutual funds and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	30.9	21.5
Fair Value, Recurring | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments sold, not yet purchased	5.8	0.1
Fair Value, Recurring | TBA and forward settling securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	17.4	116.2
Fair Value, Recurring | Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	18.2	14.4
Fair Value, Recurring | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	3,774.5	4,258.5
Fair Value, Recurring | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	(168.5)	(1,571.9)
Fair Value, Recurring | Commodities warehouse receipts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities and other assets segregated under federal and other regulations	4.7	19.7
Fair Value, Recurring | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities and other assets segregated under federal and other regulations	0.1	786
Fair Value, Recurring | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	12.9	4
Fair Value, Recurring | Money market mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	66.7	39.5
Fair Value, Recurring | Netting
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Securities and other assets segregated under federal and other regulations	0	0
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	(7,081.7)	(9,839.1)
Receivables from clients, net - Derivatives	(715.9)	(579.3)
Financial instruments owned	(721.8)	(502.4)
Total assets at fair value	(8,519.4)	(10,920.8)
Accounts payable and other accrued liabilities	0
Payables to clients - Derivatives	(5,932.7)	(9,290.3)
Financial instruments sold, not yet purchased	(579.4)	(466.3)
Total liabilities at fair value	(8,374.5)	(10,505)
Fair Value, Recurring | Netting | TBA and forward settling securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	(17.7)	(96.9)
Fair Value, Recurring | Netting | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	(1,844.7)	(651.5)
Fair Value, Recurring | Netting | Payable to broker-dealers, clearing organizations and counterparties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	(1,862.4)	(748.4)
Fair Value, Recurring | Netting | Physical commodities inventory
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Physical commodities inventory	0	0
Fair Value, Recurring | Netting | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Netting | Corporate and municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Netting | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Netting | U.S. government agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Netting | Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Netting | Agency mortgage-backed obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Netting | Asset-backed obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Fair Value, Recurring | Netting | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	(721.8)	(502.4)
Financial instruments sold, not yet purchased	(579.4)	(466.3)
Fair Value, Recurring | Netting | Commodities leases
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Fair Value, Recurring | Netting | Commodities warehouse receipts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Fair Value, Recurring | Netting | Exchange firm common stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Fair Value, Recurring | Netting | Cash flow hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Netting | Mutual funds and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Fair Value, Recurring | Netting | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Netting | TBA and forward settling securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	(17.9)	(91.4)
Fair Value, Recurring | Netting | Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	0	0
Fair Value, Recurring | Netting | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	0	0
Fair Value, Recurring | Netting | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	(7,063.8)	(9,747.7)
Fair Value, Recurring | Netting | Commodities warehouse receipts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities and other assets segregated under federal and other regulations	0	0
Fair Value, Recurring | Netting | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities and other assets segregated under federal and other regulations	0	0
Fair Value, Recurring | Netting | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Fair Value, Recurring | Netting | Money market mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Fair Value, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	79.6	43.5
Securities and other assets segregated under federal and other regulations	4.8	805.7
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	9,218.5	11,987.3
Receivables from clients, net - Derivatives	62.2	67.2
Financial instruments owned	1,023.6	773.9
Total assets at fair value	10,506	13,813.9
Accounts payable and other accrued liabilities	0
Payables to clients - Derivatives	5,359.4	7,722.5
Financial instruments sold, not yet purchased	2,127.6	1,986.9
Total liabilities at fair value	7,602.9	9,768.1
Fair Value, Recurring | Level 1 | TBA and forward settling securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	0	0
Fair Value, Recurring | Level 1 | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	115.9	58.7
Fair Value, Recurring | Level 1 | Payable to broker-dealers, clearing organizations and counterparties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	115.9	58.7
Fair Value, Recurring | Level 1 | Physical commodities inventory
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Physical commodities inventory	117.3	136.3
Fair Value, Recurring | Level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	375	367.9
Financial instruments sold, not yet purchased	297	299.9
Fair Value, Recurring | Level 1 | Corporate and municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 1 | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	542.9	347.6
Financial instruments sold, not yet purchased	1,805.1	1,686.5
Fair Value, Recurring | Level 1 | U.S. government agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 1 | Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	26.8	4.8
Financial instruments sold, not yet purchased	20.7	0.5
Fair Value, Recurring | Level 1 | Agency mortgage-backed obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 1 | Asset-backed obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Fair Value, Recurring | Level 1 | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0.6	0.7
Financial instruments sold, not yet purchased	4.8	0
Fair Value, Recurring | Level 1 | Commodities leases
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Fair Value, Recurring | Level 1 | Commodities warehouse receipts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	36.9	24.9
Fair Value, Recurring | Level 1 | Exchange firm common stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	11.1	10.6
Fair Value, Recurring | Level 1 | Cash flow hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 1 | Mutual funds and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	30.3	17.4
Fair Value, Recurring | Level 1 | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 1 | TBA and forward settling securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	0	0
Fair Value, Recurring | Level 1 | Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	18.2	14.4
Fair Value, Recurring | Level 1 | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	3,774.5	4,258.5
Fair Value, Recurring | Level 1 | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	5,425.8	7,714.4
Fair Value, Recurring | Level 1 | Commodities warehouse receipts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities and other assets segregated under federal and other regulations	4.7	19.7
Fair Value, Recurring | Level 1 | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities and other assets segregated under federal and other regulations	0.1	786
Fair Value, Recurring | Level 1 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	12.9	4
Fair Value, Recurring | Level 1 | Money market mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	66.7	39.5
Fair Value, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Securities and other assets segregated under federal and other regulations	0	0
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	1,504.8	669
Receivables from clients, net - Derivatives	653.6	511.6
Financial instruments owned	5,002.9	3,895.8
Total assets at fair value	7,319.2	5,299.9
Accounts payable and other accrued liabilities	0
Payables to clients - Derivatives	276.8	175.4
Financial instruments sold, not yet purchased	1,146.7	949
Total liabilities at fair value	3,173.2	1,869.9
Fair Value, Recurring | Level 2 | TBA and forward settling securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	24	154.9
Fair Value, Recurring | Level 2 | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	1,725.7	590.6
Fair Value, Recurring | Level 2 | Payable to broker-dealers, clearing organizations and counterparties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	1,749.7	745.5
Fair Value, Recurring | Level 2 | Physical commodities inventory
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Physical commodities inventory	157.9	223.5
Fair Value, Recurring | Level 2 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	11.2	11.8
Financial instruments sold, not yet purchased	4.8	5.7
Fair Value, Recurring | Level 2 | Corporate and municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	233.9	156.8
Financial instruments sold, not yet purchased	120.8	63.2
Fair Value, Recurring | Level 2 | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 2 | U.S. government agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	522.7	343
Financial instruments sold, not yet purchased	29.2	24.3
Fair Value, Recurring | Level 2 | Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 2 | Agency mortgage-backed obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	3,043.6	2,588.7
Financial instruments sold, not yet purchased	6.2	5.4
Fair Value, Recurring | Level 2 | Asset-backed obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	144.2	70.7
Fair Value, Recurring | Level 2 | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	1,018.6	694.3
Financial instruments sold, not yet purchased	943.6	779.7
Fair Value, Recurring | Level 2 | Commodities leases
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	21.2	26.4
Fair Value, Recurring | Level 2 | Commodities warehouse receipts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Fair Value, Recurring | Level 2 | Exchange firm common stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Fair Value, Recurring | Level 2 | Cash flow hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	7.5
Financial instruments sold, not yet purchased	37.6	70.6
Fair Value, Recurring | Level 2 | Mutual funds and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	4.1
Fair Value, Recurring | Level 2 | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments sold, not yet purchased	4.5	0.1
Fair Value, Recurring | Level 2 | TBA and forward settling securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	35.3	207.6
Fair Value, Recurring | Level 2 | Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	0	0
Fair Value, Recurring | Level 2 | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	0	0
Fair Value, Recurring | Level 2 | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	1,469.5	461.4
Fair Value, Recurring | Level 2 | Commodities warehouse receipts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities and other assets segregated under federal and other regulations	0	0
Fair Value, Recurring | Level 2 | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities and other assets segregated under federal and other regulations	0	0
Fair Value, Recurring | Level 2 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Fair Value, Recurring | Level 2 | Money market mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Fair Value, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Securities and other assets segregated under federal and other regulations	0	0
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	0	0
Receivables from clients, net - Derivatives	0
Financial instruments owned	0.6	0
Total assets at fair value	0.6	0
Accounts payable and other accrued liabilities	1.4
Payables to clients - Derivatives	0
Financial instruments sold, not yet purchased	1.3	0
Total liabilities at fair value	2.7	0
Fair Value, Recurring | Level 3 | TBA and forward settling securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	0	0
Fair Value, Recurring | Level 3 | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	0	0
Fair Value, Recurring | Level 3 | Payable to broker-dealers, clearing organizations and counterparties
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payable to broker-dealers, clearing organizations and counterparties	0	0
Fair Value, Recurring | Level 3 | Physical commodities inventory
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Physical commodities inventory	0	0
Fair Value, Recurring | Level 3 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 3 | Corporate and municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 3 | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 3 | U.S. government agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 3 | Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 3 | Agency mortgage-backed obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 3 | Asset-backed obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Fair Value, Recurring | Level 3 | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 3 | Commodities leases
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Fair Value, Recurring | Level 3 | Commodities warehouse receipts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Fair Value, Recurring | Level 3 | Exchange firm common stock
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0	0
Fair Value, Recurring | Level 3 | Cash flow hedges
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0
Financial instruments sold, not yet purchased	0	0
Fair Value, Recurring | Level 3 | Mutual funds and other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments owned	0.6	0
Fair Value, Recurring | Level 3 | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instruments sold, not yet purchased	1.3	0
Fair Value, Recurring | Level 3 | TBA and forward settling securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	0	0
Fair Value, Recurring | Level 3 | Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	0	0
Fair Value, Recurring | Level 3 | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	0	0
Fair Value, Recurring | Level 3 | Derivatives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Deposits with and receivables from broker-dealers, clearing organizations and counterparties, net	0	0
Fair Value, Recurring | Level 3 | Commodities warehouse receipts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities and other assets segregated under federal and other regulations	0	0
Fair Value, Recurring | Level 3 | U.S. Treasury obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities and other assets segregated under federal and other regulations	0	0
Fair Value, Recurring | Level 3 | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Fair Value, Recurring | Level 3 | Money market mutual funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 0	$ 0

Financial Instruments with Of_3

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2023	Sep. 30, 2022
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Financial instruments sold, not yet purchased	$ 2,696.2	$ 2,469.6
Interest rate contracts
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Maximum length of time hedged in cash flow hedge	2 years
Foreign currency forward contracts
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Maximum length of time hedged in cash flow hedge	2 years
Fair Value, Recurring | Derivatives
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Financial instruments sold, not yet purchased	$ 369	$ 313.4

Financial Instruments with Of_4

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Gross Derivative Assets and Liabilities by Type and Balance Sheet Location (Details) contract in Millions, $ in Millions	Jun. 30, 2023 USD ($) contract	Sep. 30, 2022 USD ($) contract
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	$ 8,673.1	$ 9,657.2
Derivative liability, fair value, gross liability	8,487.8	9,552.4
Impact of netting and collateral asset	(8,519.4)	(10,920.8)
Impact of netting and collateral liability	$ (8,374.5)	$ (10,505)
Derivative, number of instruments held | contract	12.8	13.3
Deposits and Receivables from Exchange Clearing Organizations
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	$ (151.1)	$ (1,455.7)
Receivable From Clients, Net
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(0.1)	(0.5)
Financial Instruments Owned
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	304.9	192.6
Payables to Clients
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	(296.5)	(1,392.4)
Payables to Broker-dealers, Clearing Organizations and Counterparties
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	3.2	55.8
Financial Instrument Sold, Not Yet Purchased
Derivatives, Fair Value [Line Items]
Derivative, fair value, net	406.6	384
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	8,665.6	9,657.2
Derivative liability, fair value, gross liability	8,450.2	9,481.8
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	7.5	0
Derivative liability, fair value, gross liability	37.6	70.6
Exchange-traded commodity derivatives | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	1,644	4,520.4
Derivative liability, fair value, gross liability	1,630.6	4,519.3
OTC commodity derivatives | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	1,865.3	756.9
Derivative liability, fair value, gross liability	1,790.4	695.6
Exchange-traded foreign exchange derivatives | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	2.4	25.6
Derivative liability, fair value, gross liability	2.4	25.7
OTC foreign exchange derivatives | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	756.3	577.1
Derivative liability, fair value, gross liability	726.5	549.3
Exchange-traded interest rate derivatives | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	1,835.3	2,626.8
Derivative liability, fair value, gross liability	1,840.2	2,626.7
OTC interest rate derivatives | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	343.4	168.9
Derivative liability, fair value, gross liability	343.4	205.1
OTC interest rate derivatives | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	0	0
Derivative liability, fair value, gross liability	37.6	48.8
Exchange-traded equity index derivatives | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	2,006.9	609.5
Derivative liability, fair value, gross liability	2,006.9	609.5
OTC equity and indices derivatives | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	176.7	164.4
Derivative liability, fair value, gross liability	85.8	95.7
TBA and forward settling securities | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	35.3	207.6
Derivative liability, fair value, gross liability	24	154.9
Foreign currency forward contracts | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative asset, fair value, gross asset	7.5	0
Derivative liability, fair value, gross liability	$ 0	$ 21.8

Financial Instruments with Of_5

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Fair Values of Derivative Instruments Designated for Hedging Held (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Jun. 30, 2023	Sep. 30, 2022
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 8,673.1	$ 9,657.2
Liability Derivatives	8,487.8	9,552.4
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives	7.5	0
Derivative assets expected to be released from Other comprehensive income into current earnings:	5.2	0
Liability Derivatives	37.6	70.6
Derivative liabilities expected to be released from Other comprehensive income into current earnings:	23.2	18.6
Designated as Hedging Instrument | Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives	7.5	0
Derivative assets expected to be released from Other comprehensive income into current earnings:	5.2	0
Liability Derivatives	0	21.8
Derivative liabilities expected to be released from Other comprehensive income into current earnings:	0	8.9
Designated as Hedging Instrument | Interest rate contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives	0	0
Liability Derivatives	37.6	48.8
Derivative liabilities expected to be released from Other comprehensive income into current earnings:	$ 23.2	$ 9.7

Financial Instruments with Of_6

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Notional Values For Derivatives Instrument (Details) - Designated as Hedging Instrument £ in Millions, zł in Millions, $ in Millions	Jun. 30, 2023 USD ($)	Jun. 30, 2023 PLN (zł)	Jun. 30, 2023 GBP (£)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 PLN (zł)	Sep. 30, 2022 GBP (£)
Interest rate contracts
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Derivative, notional amount	$ 2,000			$ 1,500
Foreign currency forward contracts | Polish Zloty
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Derivative, notional amount	33.7	zł 156.1		0	zł 0
Foreign currency forward contracts | British Pound Sterling
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Derivative, notional amount	$ 207.2		£ 168	$ 207.3		£ 168

Financial Instruments with Of_7

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Income Statement Effects of Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive income into income	$ (12.7)	$ 0.1	$ (29.2)	$ 1.8
Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Total derivatives designated as hedging instruments	(12.7)	0.1	(29.2)	1.8
Amount of gain reclassified from accumulated other comprehensive income into income as a result of a forecasted transaction that is no longer probable of occurring	0	0	0	0
Interest rate contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Total derivatives designated as hedging instruments	51.6	29.5	85.5	82.3
Amount of gain (loss) reclassified from accumulated other comprehensive income into income	(14.3)	0.1	(31.3)	1.8
Interest rate contracts | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Total derivatives designated as hedging instruments	(14.3)	$ 0.1	(31.3)	$ 1.8
Foreign currency forward contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive income into income	1.6		2.1
Foreign currency forward contracts | Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Total derivatives designated as hedging instruments	$ 1.6		$ 2.1

Financial Instruments with Of_8

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Accumulated Other Comprehensive Income Effects of Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Amount of Gain/(loss) Recognized in Other Comprehensive Income on Derivatives, net of tax	$ 2.6	$ 6.8	$ 31.6	$ 25
Amount of Gain/(Loss) Reclassified from Accumulated Other Comprehensive Income into Income	(12.7)	0.1	(29.2)	1.8
Interest rate contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Amount of Gain/(loss) Recognized in Other Comprehensive Income on Derivatives, net of tax	(0.7)	6.8	8.5	25
Amount of Gain/(Loss) Reclassified from Accumulated Other Comprehensive Income into Income	(14.3)	$ 0.1	(31.3)	$ 1.8
Foreign currency forward contracts
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Amount of Gain/(loss) Recognized in Other Comprehensive Income on Derivatives, net of tax	3.3		23.1
Amount of Gain/(Loss) Reclassified from Accumulated Other Comprehensive Income into Income	$ 1.6		$ 2.1

Financial Instruments with Of_9

Financial Instruments with Off-Balance Sheet Risk and Concentrations of Credit Risk - Realized Gains/Losses on Derivative Contracts (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Commodities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments, gain (loss) recognized in income, net	$ 105.3	$ 69.9	$ 307.3	$ 218.8
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments, gain (loss) recognized in income, net	(10.8)	47.5	(34.8)	127.2
Interest rate, equities, and indices
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments, gain (loss) recognized in income, net	51.6	29.5	85.5	82.3
TBA and forward settling securities
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments, gain (loss) recognized in income, net	42	66.2	4.9	158.2
Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments, gain (loss) recognized in income, net	$ 188.1	$ 213.1	$ 362.9	$ 586.5

Allowance for Doubtful Accoun_3

Allowance for Doubtful Accounts - Narrative (Details) - USD ($)	Jun. 30, 2023	Sep. 30, 2022
Receivables [Abstract]
Allowance for doubtful accounts - deposits with and receivables from broker-dealers, clearings organizations, and counterparties	$ 100,000	$ 1,400,000
Allowance for doubtful accounts receivable	53,200,000	46,400,000
Allowance for doubtful accounts related to notes receivable	$ 0	$ 0

Allowance for Doubtful Accoun_4

Allowance for Doubtful Accounts - Allowance for Bad Debts (Details) $ in Millions	9 Months Ended
	Jun. 30, 2023 USD ($)
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of September 30, 2022	$ 47.8
Provision for bad debts	6.9
Allowance charge-offs	(1.4)
Balance as of June 30, 2023	$ 53.3

Physical Commodities Inventor_2

Physical Commodities Inventory - Physical Commodities Inventory (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Inventory [Line Items]
Physical Ag & Energy	$ 157.9	$ 223.6
Precious metals - held by broker-dealer subsidiary	275.2	359.8
Physical commodities inventory, net	444.7	513.5
Physical Commodities Inventory - Precious Metals
Inventory [Line Items]
Precious metals - held by broker-dealer subsidiary	117.3	136.3
Precious metals - held by non-broker-dealer subsidiaries	$ 169.5	$ 153.6

Goodwill - Goodwill by Segment

Goodwill - Goodwill by Segment (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Goodwill [Line Items]
Total Goodwill	$ 59.4	$ 58.2
Commercial
Goodwill [Line Items]
Total Goodwill	33.8	32.6
Institutional
Goodwill [Line Items]
Total Goodwill	9.8	9.8
Retail
Goodwill [Line Items]
Total Goodwill	5.8	5.8
Global Payments
Goodwill [Line Items]
Total Goodwill	$ 10	$ 10

Intangible Assets - Gross and N

Intangible Assets - Gross and Net Intangible Assets by Major Class (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross amount	$ 71	$ 61.5
Finite-lived intangible assets, accumulated amortization	(50.9)	(39)
Total intangible assets subject to amortization	20.1	22.5
Indefinite-lived intangible assets	5.7	5.5
Intangible assets, gross amount	76.7	67
Total intangible assets, net amount	25.8	28
Website domains
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived license agreements	2	1.8
Business licenses
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	3.7	3.7
Trade/domain names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived trade/domain names, gross amount	4.1	3.7
Finite-lived intangible assets, accumulated amortization	(2.2)	(1.6)
Total intangible assets subject to amortization	1.9	2.1
Software programs/platforms
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived software programs/platforms, gross amount	28.6	28.3
Finite-lived intangible assets, accumulated amortization	(26.1)	(19.4)
Total intangible assets subject to amortization	2.5	8.9
Client and supplier base
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived customer base, gross amount	38.3	29.5
Finite-lived intangible assets, accumulated amortization	(22.6)	(18)
Total intangible assets subject to amortization	$ 15.7	$ 11.5

Intangible Assets - Narrative (

Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 3.9	$ 3.6	$ 11.9	$ 11

Intangible Assets - Finite-Live

Intangible Assets - Finite-Lived Intangible Assets Future Amortization Expense (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Fiscal 2023 (remaining three months)	$ 2.5
Fiscal 2024	6.8
Fiscal 2025	3.6
Fiscal 2026	2.8
Fiscal 2027 and thereafter	4.4
Total intangible assets subject to amortization	$ 20.1	$ 22.5

Credit Facilities - Credit Faci

Credit Facilities - Credit Facilities (Details)	Jun. 30, 2023 USD ($) facility	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2020 USD ($)
Line of Credit Facility [Line Items]
Number of credit facilities | facility	4
Maximum borrowing capacity under credit facilities	$ 1,155,000,000
Notes payable to bank	7,600,000		$ 8,100,000	$ 9,000,000
Debt, weighted average interest rate				2.35%
Senior StoneX Group Inc. Committed Credit Facility - Revolving Line of Credit
Line of Credit Facility [Line Items]
Line of credit facility borrowing	500,000,000	$ 475,000,000
StoneX Financial Inc.
Line of Credit Facility [Line Items]
Line of credit facility borrowing	180,000,000		$ 75,000,000
StoneX Commodity Solutions LLC
Line of Credit Facility [Line Items]
Line of credit facility borrowing	400,000,000
StoneX Financial Ltd.
Line of Credit Facility [Line Items]
Line of credit facility borrowing	$ 75,000,000

Credit Facilities - Senior Secu

Credit Facilities - Senior Secured Notes (Details) - Senior Secured Notes due 2025 - USD ($)	Jun. 30, 2023	Jun. 11, 2020
Line of Credit Facility [Line Items]
Debt instrument, face amount		$ 350,000,000
Debt instrument, interest rate, stated percentage	8.625%	8.625%
Debt instrument offering price, percentage		98.50%
Debt issuance costs, gross		$ 9,500,000

Credit Facilities - Credit Fa_2

Credit Facilities - Credit Facilities and Financing Bridge Commitment (Details)	Jun. 30, 2023 USD ($) lender	Mar. 31, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2020 USD ($)
Line of Credit Facility [Line Items]
Maximum borrowing capacity under credit facilities	$ 1,155,000,000
Amount outstanding	392,100,000		$ 477,000,000
Uncommitted Credit Facilities	22,900,000		0
Note Payable to Bank	7,600,000		8,100,000	$ 9,000,000
Senior Secured Notes	341,300,000		339,100,000
Total outstanding borrowings	763,900,000		824,200,000
Debt instrument, unamortized discount (premium) and debt issuance costs, net	6,600,000		8,800,000
Senior StoneX Group Inc. Committed Credit Facility - Revolving Line of Credit
Line of Credit Facility [Line Items]
Line of credit facility borrowing	500,000,000	$ 475,000,000
Long-term line of credit, noncurrent	230,000,000		260,000,000
Senior StoneX Group Inc. Committed Credit Facility - Revolving Line of Credit | Secured Debt
Line of Credit Facility [Line Items]
Line of credit facility borrowing	$ 42,500,000
Number of lender | lender	1
StoneX Financial Inc.
Line of Credit Facility [Line Items]
Line of credit facility borrowing	$ 180,000,000		75,000,000
Line of credit facility	0		0
StoneX Commodity Solutions LLC
Line of Credit Facility [Line Items]
Line of credit facility borrowing	400,000,000
Line of credit facility	162,100,000		217,000,000
StoneX Financial Ltd.
Line of Credit Facility [Line Items]
Line of credit facility borrowing	75,000,000
Line of credit facility	$ 0		$ 0

Securities and Commodity Fina_3

Securities and Commodity Financing Transactions - Collateral Maturities of Gross Obligations (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 11,813.4	$ 6,133.5
Securities loaned	1,093.3	1,189.5
Gross amount of secured financing	12,906.7	7,323
Overnight and Open
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	11,141.4	3,664.7
Securities loaned	1,093.3	1,189.5
Gross amount of secured financing	12,234.7	4,854.2
Less than 30 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	557.9	2,279.1
Securities loaned	0	0
Gross amount of secured financing	557.9	2,279.1
30-90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	69.1	186.3
Securities loaned	0	0
Gross amount of secured financing	69.1	186.3
Over 90 Days
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	45	3.4
Securities loaned	0	0
Gross amount of secured financing	$ 45	$ 3.4

Securities and Commodity Fina_4

Securities and Commodity Financing Transactions - Underlying Collateral Types of Gross Obligations (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 11,813.4	$ 6,133.5
Securities loaned	1,093.3	1,189.5
Gross amount of secured financing	12,906.7	7,323
U.S. Treasury obligations
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	6,169.3	1,311
U.S. government agency obligations
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	676.5	604.1
Asset-backed obligations
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	122.6	178
Agency mortgage-backed obligations
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	4,425.9	3,762.5
Foreign government obligations
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	130.6	97.2
Corporate bonds
Assets Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	288.5	180.7
Equity securities
Assets Sold under Agreements to Repurchase [Line Items]
Securities loaned	$ 1,093.3	$ 1,189.5

Securities and Commodity Fina_5

Securities and Commodity Financing Transactions - Netting of Securities Purchased Under Agreements (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Broker-Dealer [Abstract]
Securities purchased under agreements to resell, gross	$ 9,425.9	$ 4,609.9
Securities purchased under agreements to resell, offset	(6,783.9)	(2,937.9)
Securities purchased under agreements to resell, net	2,642	1,672
Securities borrowed, gross	1,094.3	1,209.8
Securities borrowed, net	1,094.3	1,209.8
Securities sold under agreements to repurchase, gross	11,813.4	6,133.5
Securities sold under agreements to repurchase, offset	(6,783.9)	(2,937.9)
Securities sold under agreements to repurchase, net	5,029.5	3,195.6
Securities loaned, gross	1,093.3	1,189.5
Securities loaned, net	$ 1,093.3	$ 1,189.5

Securities and Commodity Fina_6

Securities and Commodity Financing Transactions - Carrying Value of Collateral Pledged, Received and Repledged (Details) - USD ($) $ in Millions	Jun. 30, 2023	Sep. 30, 2022
Assets Sold under Agreements to Repurchase [Line Items]
Securities pledged or repledged to cover collateral requirements for tri-party arrangements	$ 5,305.3	$ 4,167.3
Securities received as collateral that may be repledged	10,636	5,836.1
Securities received as collateral that may be repledged covering securities sold short	2,149.1	1,615.3
Asset Pledged as Collateral with Right
Assets Sold under Agreements to Repurchase [Line Items]
Repledged securities borrowed and client securities held under custodial clearing arrangements to collateralize securities loaned agreements	1,084.3	1,146
Tri-party Repurchase Agreements | Asset Pledged as Collateral without Right
Assets Sold under Agreements to Repurchase [Line Items]
Securities pledged or repledged to cover collateral requirements for tri-party arrangements	$ 5,039.7	$ 3,787.8

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	1 Months Ended
	Nov. 30, 2018 account	Jun. 30, 2023 USD ($)
Loss Contingencies [Line Items]
Loss contingency, range of possible loss, portion not accrued		$ 20.8
Maximum amount of individual accounts receivable account		1.4
Accrual		6.6
Self insurance reserve		$ 1.6
StoneX Financial
Loss Contingencies [Line Items]
Number of accounts | account	300

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,247.3	$ 1,005.6	$ 1,070.1	$ 904
Other comprehensive income, net of tax	6.7	(12.2)	47.1	(30.5)
Ending balance	1,329.9	1,047.3	1,329.9	1,047.3
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(34.4)
Other comprehensive income, net of tax			15.5
Ending balance	(18.9)		(18.9)
Pension Benefits Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(2.7)
Other comprehensive income, net of tax			0
Ending balance	(2.7)		(2.7)
Cash Flow Hedge
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(53.5)
Other comprehensive income, net of tax			31.6
Ending balance	(21.9)		(21.9)
Accumulated Other Comprehensive Loss, net
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(50.2)	(43.4)	(90.6)	(25.1)
Other comprehensive income, net of tax	6.7	(12.2)	47.1	(30.5)
Ending balance	$ (43.5)	$ (55.6)	$ (43.5)	$ (55.6)

Revenue from Contracts with C_3

Revenue from Contracts with Clients - Revenue from Contracts with Clients (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 980.7	$ 850.6	$ 2,844.9	$ 2,742.1
Principal gains, net	300	295.2	810.8	869.8
Interest income	262.7	50.1	685.7	112.3
Revenues	15,047.9	18,930.9	44,220.5	49,655
Total operating revenues	776.9	528.8	2,136.1	1,524
United States
Disaggregation of Revenue [Line Items]
Revenues	1,428.9	1,278.3	4,463.6	3,607.6
Total operating revenues	559.6	354.7	1,588	1,023.3
Europe
Disaggregation of Revenue [Line Items]
Revenues	1,014.8	813.1	2,841.8	2,631.3
Total operating revenues	145.1	125.8	352.1	364.8
South America
Disaggregation of Revenue [Line Items]
Revenues	65.9	21.7	184.6	63
Total operating revenues	34.3	21.7	97.8	63
Middle East and Asia
Disaggregation of Revenue [Line Items]
Revenues	12,534.9	16,814.7	36,721.2	43,345.4
Total operating revenues	34.4	23.5	88.9	65.3
Other
Disaggregation of Revenue [Line Items]
Revenues	3.4	3.1	9.3	7.7
Total operating revenues	3.5	3.1	9.3	7.6
Point-in-time
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	941.9	821.1	2,729.2	2,658.5
Time elapsed
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	38.8	29.5	115.7	83.6
Exchange-traded futures and options
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	57.6	53.1	161.6	155.4
OTC derivative brokerage
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2	4	10.1	13.3
Equities and fixed income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	13.6	15.4	44.6	47.1
Mutual funds
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0.7	1	2.2	3.4
Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2	2.2	6.5	7.4
Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2	0.6	4.2	2.3
Total sales-based commission
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	77.9	76.3	229.2	228.9
Mutual funds
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3.1	3.4	9.2	10.9
Insurance and annuity products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3.5	3.9	10.5	12.5
Total trailing commission
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	6.6	7.3	19.7	23.4
Clearing fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	38.6	38.8	114.6	115.8
Trade conversion fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1.7	3	6.1	9
Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2	1.5	5.9	4.5
Total commission and clearing fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	126.8	126.9	375.5	381.6
Revenues	126.8	126.9	375.5	381.6
Underwriting fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	0.2	0.1	0.5	0.4
Asset management fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	11.5	11.5	33.3	33.5
Advisory and consulting fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	8.4	8.2	26.1	23.2
Sweep program fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	12.3	2.5	36.6	3.5
Client account fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	4	3.8	11.5	11.8
Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2.8	1.6	11.7	4.8
Total consulting, management, and account fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	39.2	27.7	119.7	77.2
Revenues	39.2	27.7	119.7	77.2
Precious metals sales
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	814.7	696	2,349.7	2,283.3
Physical precious metals trading
Disaggregation of Revenue [Line Items]
Sales of physical commodities	12,513.4	16,808.1	36,695.5	43,334.7
Physical agricultural and energy product trading
Disaggregation of Revenue [Line Items]
Sales of physical commodities	$ 991.1	$ 926.9	$ 3,183.6	$ 2,596.1
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Clients
Disaggregation of Revenue [Line Items]
Revenues from contracts with clients as a percentage of total revenues	6.50%	4.50%	6.40%	5.50%

Revenue from Contracts with C_4

Revenue from Contracts with Clients - Schedule of Principal Gains, Net Related To Income and Expense of Dividends (Details) - Equity securities - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Dividend (loss)/income, net reported within Principal Gains, net	$ (1.4)	$ (0.4)	$ (1.3)	$ 9.2
Dividend income on long equity positions
Disaggregation of Revenue [Line Items]
Dividend (loss)/income, net reported within Principal Gains, net	10.2	31.6	27.5	119.1
Dividend expense on short equity positions
Disaggregation of Revenue [Line Items]
Dividend (loss)/income, net reported within Principal Gains, net	$ (11.6)	$ (32)	$ (28.8)	$ (109.9)

Other Expenses - Other Expenses

Other Expenses - Other Expenses Breakout (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other Expenses [Abstract]
Non-income taxes	$ 4.1	$ 4.6	$ 11	$ 13.7
Insurance	2.5	2.8	8.2	8.2
Employee related expenses	2.1	2.9	8	6.9
Other direct business expenses	3	2.5	11.1	6.9
Membership fees	0.9	0.6	2.8	2.4
Director and public company expenses	0.5	0.3	1.5	1.3
Office expenses	0.5	0.4	1.4	1.2
Other expenses	1.8	1.7	6.1	4
Total other expenses	$ 15.4	$ 15.8	$ 50.1	$ 44.6

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Tax Disclosure [Abstract]
Income tax expense	$ 25	$ 21.8	$ 59.8	$ 56
Effective income tax rate	26%	31%

Regulatory Capital Requiremen_3

Regulatory Capital Requirements (Details) $ in Millions	Jun. 30, 2023 USD ($)
Capital and Other Regulatory Requirements [Abstract]
Adjusted net capital	$ 10
StoneX Financial Inc.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Actual	364.4
Minimum Requirement	214.1
StoneX Financial Ltd.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Actual	492.6
Minimum Requirement	358
Gain Capital Group, LLC
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Actual	50.4
Minimum Requirement	29.3
StoneX Financial Pte. Ltd.
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Actual	70.9
Minimum Requirement	22.1
StoneX Markets LLC
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Actual	221
Minimum Requirement	$ 123.7

Acquisitions - Cotton Distribut

Acquisitions - Cotton Distributors Inc. (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Oct. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Business Acquisition [Line Items]
Net operating revenues		$ 435.9	$ 374.1	$ 1,217.3	$ 1,088.2
Net income		69.5	$ 49.1	187.8	154.8
Identifiable intangible assets acquired
Gain on acquisition				23.5	$ 0
Cotton Distributors Inc.
Business Acquisition [Line Items]
Consideration transferred	$ 42.7
Net operating revenues		11.7		24
Net income		$ 7.2		$ 12.3
Identifiable intangible assets acquired
Cash and cash equivalents	8.2
Deposits with and receivables from broker-dealers, clearing organizations, and counterparties	7.7
Receivables from clients, net	51.9
Financial instruments owned, at fair value	45.7
Deferred income taxes, net	(3.3)
Property and equipment, net	0.1
Physical commodities inventory, net	22.5
Other assets	6.7
Total fair value of tangible assets acquired	139.5
Accounts payable and other accrued liabilities	40
Financial instruments sold, not yet purchased, at fair value	28.3
Payables to lenders under loans	10.1
Payable to broker-dealers, clearing organizations, and counterparties	0.4
Payable to clients	2.6
Income taxes payable	0.8
Total fair value of tangible liabilities assumed	82.2
Fair value of tangible net assets acquired	57.3
Total fair value of intangible assets acquired	8.9
Fair value of identifiable net assets acquired	66.2
Total merger consideration	42.7
Gain on acquisition	23.5
Cotton Distributors Inc. | Client relationships
Identifiable intangible assets acquired
Total fair value of intangible assets acquired	4.7
Cotton Distributors Inc. | Supplier relationships
Identifiable intangible assets acquired
Total fair value of intangible assets acquired	3.7
Cotton Distributors Inc. | Trade name
Identifiable intangible assets acquired
Total fair value of intangible assets acquired	0.4
Cotton Distributors Inc. | Non-compete
Identifiable intangible assets acquired
Total fair value of intangible assets acquired	$ 0.1

Acquisitions - Incomm S.A.S.. (

Acquisitions - Incomm S.A.S.. (Details) - USD ($) $ in Millions	Feb. 03, 2023	Jun. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Goodwill		$ 59.4	$ 58.2
Incomm S.A.S..
Business Acquisition [Line Items]
Consideration transferred	$ 0.2
Annual payment	$ 1.3
Contingent consideration, liability term	4 years
Goodwill	$ 1.3

Segment Analysis - Narrative (D

Segment Analysis - Narrative (Details)	9 Months Ended
	Jun. 30, 2023 employee currency country market
Segment Reporting Information [Line Items]
Number of employees | employee	4,000
Number of countries in which entity operates	180
Number of global financial markets | market	18,000
Global Payments
Segment Reporting Information [Line Items]
Number of countries in which entity operates	185
Number of different types of foreign currencies | currency	140

Segment Analysis - Segment Repo

Segment Analysis - Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Segment Reporting Information [Line Items]
Revenues	$ 15,047.9	$ 18,930.9	$ 44,220.5	$ 49,655
Operating revenues	776.9	528.8	2,136.1	1,524
Net operating revenues (loss)	435.9	374.1	1,217.3	1,088.2
Net contribution	340.8	281.9	949.1	826.6
Segment income	207.9	171.1	560.2	505.9
Net costs not allocated to operating segments	(113.4)	(100.2)	(336.1)	(295.1)
Gain on acquisition	0	0	23.5	0
Income before tax	94.5	70.9	247.6	210.8
Assets	21,933.1		21,933.1		$ 19,859.6
Corporate Unallocated
Segment Reporting Information [Line Items]
Revenues	8.6	2.9	23.9	6.9
Operating revenues	8.6	2.9	23.9	6.9
Net operating revenues (loss)	(14.1)	(13.5)	(47)	(41.4)
Assets	725.1		725.1		746.3
Eliminations
Segment Reporting Information [Line Items]
Revenues	(10.2)	(6.2)	(29.1)	(15.6)
Operating revenues	(10.2)	(6.2)	(29.1)	(15.6)
Commercial
Segment Reporting Information [Line Items]
Net contribution	156.9	101.9	413.5	302.2
Segment income	117	72.5	302.7	208.1
Commercial | Operating Segments
Segment Reporting Information [Line Items]
Revenues	14,444.5	18,368.7	42,188.7	47,984.8
Operating revenues	252.7	170.2	655.2	506.9
Net operating revenues (loss)	213.6	141.9	551.4	427.4
Assets	5,036.6		5,036.6		5,931
Institutional
Segment Reporting Information [Line Items]
Net contribution	81.7	74.7	265.6	214.4
Segment income	45.1	47.7	162.9	129.6
Institutional | Operating Segments
Segment Reporting Information [Line Items]
Revenues	381.1	209.1	1,087.1	573.2
Operating revenues	381.1	209.1	1,087.1	573.2
Net operating revenues (loss)	120.3	126.4	401.4	352.1
Assets	14,594.1		14,594.1		11,687.1
Retail
Segment Reporting Information [Line Items]
Net contribution	60.3	71.7	147.9	212.4
Segment income	17.2	26.3	17.8	95.2
Retail | Operating Segments
Segment Reporting Information [Line Items]
Revenues	170.7	312.1	791.5	978
Operating revenues	91.5	108.5	240.6	324.9
Net operating revenues (loss)	65.1	77.9	159.8	229.5
Assets	1,022.2		1,022.2		971.2
Global Payments
Segment Reporting Information [Line Items]
Net contribution	41.9	33.6	122.1	97.6
Segment income	28.6	24.6	76.8	73
Global Payments | Operating Segments
Segment Reporting Information [Line Items]
Revenues	53.2	44.3	158.4	127.7
Operating revenues	53.2	44.3	158.4	127.7
Net operating revenues (loss)	51	$ 41.4	151.7	$ 120.6
Assets	$ 555.1		$ 555.1		$ 524