$SNEX
StoneX Group Inc. Stock $snex

$snex Overview Financials Valuation SEC Filings Company Website

2021 Q1 Form 10-Q Financial Statement

#000091376021000077 Filed on May 10, 2021

Income Statement

Concept	2021 Q1	2020 Q1	2019 Q4
Revenue	$11.24B	$20.37B	$11.25B
YoY Change	-44.79%	183.17%	71.62%
Cost Of Revenue	$10.80B	$20.00B	$10.97B
YoY Change	-46.02%	188.96%	174444432.8%
Gross Profit	$471.4M	$366.8M	$276.8M
YoY Change	28.52%	35.3%	4.57%
Gross Profit Margin	4.19%	1.8%	2.46%
Selling, General & Admin	$285.0M	$210.0M	$169.0M
YoY Change	35.71%	32.08%	11.18%
% of Gross Profit	60.46%	57.25%	61.05%
Research & Development			$10.40M
YoY Change			13.04%
% of Gross Profit			3.76%
Depreciation & Amortization	$8.600M	$4.200M	$3.900M
YoY Change	104.76%	31.25%	34.48%
% of Gross Profit	1.82%	1.15%	1.41%
Operating Expenses	$374.0M	$280.0M	$10.40M
YoY Change	33.57%	2847.37%	13.04%
Operating Profit	$97.40M	$86.80M	$266.4M
YoY Change	12.21%	-66.82%	4.27%
Interest Expense	$11.10M	$27.80M	$31.10M
YoY Change	-60.07%	-21.02%	2.98%
% of Operating Profit	11.4%	32.03%	11.67%
Other Income/Expense, Net	$1.900M	$2.900M	$2.600M
YoY Change	-34.48%	11.54%	4.0%
Pretax Income	$76.30M	$56.10M	$21.70M
YoY Change	36.01%	81.55%	-11.07%
Income Tax	$21.00M	$16.80M	$5.400M
% Of Pretax Income	27.52%	29.95%	24.88%
Net Earnings	$55.30M	$39.30M	$16.30M
YoY Change	40.71%	67.95%	-10.44%
Net Earnings / Revenue	0.49%	0.19%	0.14%
Basic Earnings Per Share	$2.81	$2.03	$0.85
Diluted Earnings Per Share	$2.73	$2.00	$0.84
COMMON SHARES
Basic Shares Outstanding	19.11M shares	18.87M shares	18.75M shares
Diluted Shares Outstanding	19.67M shares	19.19M shares	19.07M shares

Balance Sheet

Concept	2021 Q1	2020 Q1	2019 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.002B	$520.0M	$339.0M
YoY Change	92.69%	89.78%	-5.31%
Cash & Equivalents	$1.002B	$3.690B	$3.069B
Short-Term Investments
Other Short-Term Assets	$6.464B	$4.536B	$3.760B
YoY Change	42.5%
Inventory	$450.8M	$255.2M	$249.7M
Prepaid Expenses
Receivables	$479.0M	$481.0M	$329.0M
Other Receivables	$15.00M	$2.000M	$5.000M
Total Short-Term Assets	$7.960B	$5.539B	$4.433B
YoY Change	43.71%	855.0%	523.49%
LONG-TERM ASSETS
Property, Plant & Equipment	$86.10M	$43.00M	$43.30M
YoY Change	100.23%	-5.7%	96867908.95%
Goodwill	$54.50M	$52.20M	$55.50M
YoY Change	4.41%	12.02%	14.2%
Intangibles	$48.00M	$20.90M	$16.00M
YoY Change	129.67%	63.28%	49.53%
Long-Term Investments	$6.946B	$4.850B	$5.208B
YoY Change	43.22%	-5.44%	23.73%
Other Assets	$35.00M	$14.00M	$19.00M
YoY Change	150.0%	-99.57%	-99.44%
Total Long-Term Assets	$7.840B	$5.332B	$5.696B
YoY Change	47.03%	-39.6%	-901.18%
TOTAL ASSETS
Total Short-Term Assets	$7.960B	$5.539B	$4.433B
Total Long-Term Assets	$7.840B	$5.332B	$5.696B
Total Assets	$15.80B	$10.87B	$10.13B
YoY Change	45.34%	15.55%	116288287.58%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$7.065B	$4.961B	$3.984B
YoY Change	42.41%	38.96%	13.86%
Accrued Expenses	$116.0M	$34.00M	$36.00M
YoY Change	241.18%
Deferred Revenue
YoY Change
Short-Term Debt	$5.514B	$3.869B	$4.362B
YoY Change	42.52%	2.87%	967.81%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$5.929B	$8.875B	$4.538B
YoY Change	-33.19%	20.88%	33.08%
LONG-TERM LIABILITIES
Long-Term Debt	$827.0M	$459.0M	$325.0M
YoY Change	80.17%	6.99%	-25.29%
Other Long-Term Liabilities	$1.118B	$704.0M	$666.0M
YoY Change	58.81%	-26.44%	-20.71%
Total Long-Term Liabilities	$1.945B	$1.163B	$991.0M
YoY Change	67.24%	-16.09%	-22.27%
TOTAL LIABILITIES
Total Short-Term Liabilities	$5.929B	$8.875B	$4.538B
Total Long-Term Liabilities	$1.945B	$1.163B	$991.0M
Total Liabilities	$14.94B	$10.22B	$9.514B
YoY Change	46.15%	15.43%	116248907.27%
SHAREHOLDERS EQUITY
Retained Earnings	$641.0M	$458.4M	$419.1M
YoY Change	39.83%	27.83%	125029732.94%
Common Stock
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$57.60M	$57.60M	$50.50M
YoY Change	0.0%	24.41%	109071174.3%
Treasury Stock Shares	2.422M shares	2.422M shares	2.232M shares
Shareholders Equity	$860.2M	$648.6M	$614.9M
YoY Change
Total Liabilities & Shareholders Equity	$15.80B	$10.87B	$10.13B
YoY Change	45.34%	15.55%	116288287.58%

Cashflow Statement

Concept	2021 Q1	2020 Q1	2019 Q4
OPERATING ACTIVITIES
Net Income	$55.30M	$39.30M	$16.30M
YoY Change	40.71%	67.95%	-10.44%
Depreciation, Depletion And Amortization	$8.600M	$4.200M	$3.900M
YoY Change	104.76%	31.25%	34.48%
Cash From Operating Activities	$783.8M	$502.4M	$667.6M
YoY Change	56.01%	560.18%	-413.43%
INVESTING ACTIVITIES
Capital Expenditures	-$17.60M	-$2.700M	$1.800M
YoY Change	551.85%	-3.57%	-60.0%
Acquisitions			$5.100M
YoY Change			628.57%
Other Investing Activities	$0.00	-$2.700M	-$5.100M
YoY Change	-100.0%	-61.97%	628.57%
Cash From Investing Activities	-$17.60M	-$5.400M	-$6.900M
YoY Change	225.93%	-45.45%	32.69%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$7.100M	$400.0K
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-58.10M	127.8M	-$43.70M
YoY Change	-145.46%	-1781.58%	-154.9%
NET CHANGE
Cash From Operating Activities	783.8M	502.4M	$667.6M
Cash From Investing Activities	-17.60M	-5.400M	-$6.900M
Cash From Financing Activities	-58.10M	127.8M	-$43.70M
Net Change In Cash	708.1M	624.8M	$617.7M
YoY Change	13.33%	966.21%	-546.64%
FREE CASH FLOW
Cash From Operating Activities	$783.8M	$502.4M	$667.6M
Capital Expenditures	-$17.60M	-$2.700M	$1.800M
Free Cash Flow	$801.4M	$505.1M	$665.8M
YoY Change	58.66%	540.18%	-406.11%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0000913760
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--09-30
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
	dei	Amendment Flag AmendmentFlag	false
CY2019	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201802Member
CY2020	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	us-gaap:AccountingStandardsUpdate201613Member
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2021-03-31
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	000-23554
	dei	Entity Registrant Name EntityRegistrantName	StoneX Group Inc.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	59-2921318
	dei	Entity Address Address Line1 EntityAddressAddressLine1	230 Park Ave
	dei	Entity Address Address Line2 EntityAddressAddressLine2	10th Floor
	dei	Entity Address City Or Town EntityAddressCityOrTown	New York
	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10169
	dei	City Area Code CityAreaCode	(212)
	dei	Local Phone Number LocalPhoneNumber	485-3500
	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value
	dei	Trading Symbol TradingSymbol	SNEX
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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CY2020Q1	us-gaap	Floor Brokerage Exchange And Clearance Fees FloorBrokerageExchangeAndClearanceFees	63800000	USD
	us-gaap	Floor Brokerage Exchange And Clearance Fees FloorBrokerageExchangeAndClearanceFees	140200000	USD
	us-gaap	Floor Brokerage Exchange And Clearance Fees FloorBrokerageExchangeAndClearanceFees	110100000	USD
CY2021Q1	us-gaap	Noninterest Expense Commission Expense NoninterestExpenseCommissionExpense	40800000	USD
CY2020Q1	us-gaap	Noninterest Expense Commission Expense NoninterestExpenseCommissionExpense	29600000	USD
	us-gaap	Noninterest Expense Commission Expense NoninterestExpenseCommissionExpense	79000000.0	USD
	us-gaap	Noninterest Expense Commission Expense NoninterestExpenseCommissionExpense	55800000	USD
CY2021Q1	us-gaap	Interest Expense InterestExpense	11100000	USD
CY2020Q1	us-gaap	Interest Expense InterestExpense	27800000	USD
	us-gaap	Interest Expense InterestExpense	21000000.0	USD
	us-gaap	Interest Expense InterestExpense	58900000	USD
CY2021Q1	intl	Interest Expense On Corporate Funding InterestExpenseOnCorporateFunding	10500000	USD
CY2020Q1	intl	Interest Expense On Corporate Funding InterestExpenseOnCorporateFunding	2200000	USD
	intl	Interest Expense On Corporate Funding InterestExpenseOnCorporateFunding	21000000.0	USD
	intl	Interest Expense On Corporate Funding InterestExpenseOnCorporateFunding	4900000	USD
CY2021Q1	us-gaap	Revenues Net Of Interest Expense RevenuesNetOfInterestExpense	334200000	USD
CY2020Q1	us-gaap	Revenues Net Of Interest Expense RevenuesNetOfInterestExpense	243400000	USD
	us-gaap	Revenues Net Of Interest Expense RevenuesNetOfInterestExpense	590300000	USD
	us-gaap	Revenues Net Of Interest Expense RevenuesNetOfInterestExpense	413900000	USD
CY2021Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	185000000.0	USD
CY2020Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	136700000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	338600000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	240700000	USD
CY2021Q1	intl	Tradingsystemsandmarketinformation Tradingsystemsandmarketinformation	14800000	USD
CY2020Q1	intl	Tradingsystemsandmarketinformation Tradingsystemsandmarketinformation	11200000	USD
	intl	Tradingsystemsandmarketinformation Tradingsystemsandmarketinformation	28500000	USD
	intl	Tradingsystemsandmarketinformation Tradingsystemsandmarketinformation	21600000	USD
CY2021Q1	us-gaap	Professional Fees ProfessionalFees	9000000.0	USD
CY2020Q1	us-gaap	Professional Fees ProfessionalFees	4700000	USD
	us-gaap	Professional Fees ProfessionalFees	18300000	USD
	us-gaap	Professional Fees ProfessionalFees	10700000	USD
CY2021Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	10600000	USD
CY2020Q1	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	5900000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	21500000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	11900000	USD
CY2021Q1	us-gaap	Occupancy Net OccupancyNet	7500000	USD
CY2020Q1	us-gaap	Occupancy Net OccupancyNet	4900000	USD
	us-gaap	Occupancy Net OccupancyNet	16100000	USD
	us-gaap	Occupancy Net OccupancyNet	9900000	USD
CY2021Q1	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	6500000	USD
CY2020Q1	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	4200000	USD
	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	15300000	USD
	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	5600000	USD
CY2021Q1	us-gaap	Travel And Entertainment Expense TravelAndEntertainmentExpense	500000	USD
CY2020Q1	us-gaap	Travel And Entertainment Expense TravelAndEntertainmentExpense	3200000	USD
	us-gaap	Travel And Entertainment Expense TravelAndEntertainmentExpense	1500000	USD
	us-gaap	Travel And Entertainment Expense TravelAndEntertainmentExpense	7700000	USD
CY2021Q1	us-gaap	Communication Communication	2400000	USD
CY2020Q1	us-gaap	Communication Communication	1500000	USD
	us-gaap	Communication Communication	4700000	USD
	us-gaap	Communication Communication	3100000	USD
CY2021Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	8600000	USD
CY2020Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	4200000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	17000000.0	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	8100000	USD
CY2021Q1	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	900000	USD
CY2020Q1	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	4400000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2400000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	4400000	USD
CY2021Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	12100000	USD
CY2020Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	6400000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	23200000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	12500000	USD
CY2021Q1	us-gaap	Noninterest Expense NoninterestExpense	257900000	USD
CY2020Q1	us-gaap	Noninterest Expense NoninterestExpense	187300000	USD
	us-gaap	Noninterest Expense NoninterestExpense	487100000	USD
	us-gaap	Noninterest Expense NoninterestExpense	336200000	USD
CY2021Q1	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	0	USD
CY2020Q1	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	0	USD
	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	0	USD
	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	100000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	76300000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	56100000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	103200000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	77800000	USD
CY2021Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21000000.0	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16800000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28400000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22200000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	55300000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	39300000	USD
	us-gaap	Net Income Loss NetIncomeLoss	74800000	USD
	us-gaap	Net Income Loss NetIncomeLoss	55600000	USD
CY2021Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.81
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.03
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.81
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.88
CY2021Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.73
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.00
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.71
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.84
CY2021Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19112216	shares
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18872937	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19025604	shares
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19189953	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18811268	shares
CY2021Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19670539	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19570028	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19132497	shares
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	55300000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	39300000	USD
	us-gaap	Net Income Loss NetIncomeLoss	74800000	USD
	us-gaap	Net Income Loss NetIncomeLoss	55600000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-1600000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-3400000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	12300000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-2700000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1600000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-3400000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	12300000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2700000	USD
CY2021Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	53700000	USD
CY2020Q1	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	35900000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	87100000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	52900000	USD
	us-gaap	Net Income Loss NetIncomeLoss	74800000	USD
	us-gaap	Net Income Loss NetIncomeLoss	55600000	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	17000000.0	USD
	us-gaap	Depreciation And Amortization DepreciationAndAmortization	8100000	USD
	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	4800000	USD
	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	3900000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2400000	USD
	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	4400000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	4200000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1000000.0	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	2100000	USD
	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	700000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	6500000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	5000000.0	USD
	us-gaap	Increase Decrease In Restricted Cash And Investments For Operating Activities IncreaseDecreaseInRestrictedCashAndInvestmentsForOperatingActivities	89600000	USD
	us-gaap	Increase Decrease In Restricted Cash And Investments For Operating Activities IncreaseDecreaseInRestrictedCashAndInvestmentsForOperatingActivities	-297900000	USD
	us-gaap	Increase Decrease In Receivables Under Repurchase Agreements IncreaseDecreaseInReceivablesUnderRepurchaseAgreements	601000000.0	USD
	us-gaap	Increase Decrease In Receivables Under Repurchase Agreements IncreaseDecreaseInReceivablesUnderRepurchaseAgreements	-164500000	USD
	us-gaap	Increase Decrease In Securities Borrowed IncreaseDecreaseInSecuritiesBorrowed	295300000	USD
	us-gaap	Increase Decrease In Securities Borrowed IncreaseDecreaseInSecuritiesBorrowed	-359400000	USD
	intl	Increase Decrease In Deposits With And Receivables From Broker Dealers Clearing Organizations And Counterparties IncreaseDecreaseInDepositsWithAndReceivablesFromBrokerDealersClearingOrganizationsAndCounterparties	189500000	USD
	intl	Increase Decrease In Deposits With And Receivables From Broker Dealers Clearing Organizations And Counterparties IncreaseDecreaseInDepositsWithAndReceivablesFromBrokerDealersClearingOrganizationsAndCounterparties	52200000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	78600000	USD
	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	63200000	USD
	us-gaap	Increase Decrease In Notes Receivables IncreaseDecreaseInNotesReceivables	5000000.0	USD
	us-gaap	Increase Decrease In Notes Receivables IncreaseDecreaseInNotesReceivables	1000000.0	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-1300000	USD
	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-8700000	USD
	us-gaap	Increase Decrease In Financial Instruments Used In Operating Activities IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities	185400000	USD
	us-gaap	Increase Decrease In Financial Instruments Used In Operating Activities IncreaseDecreaseInFinancialInstrumentsUsedInOperatingActivities	350500000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	169700000	USD
	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	25900000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	22500000	USD
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	0	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	10000000.0	USD
	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	30200000	USD
	intl	Increase Decrease In Operating Lease Liabilities IncreaseDecreaseInOperatingLeaseLiabilities	-3200000	USD
	intl	Increase Decrease In Operating Lease Liabilities IncreaseDecreaseInOperatingLeaseLiabilities	-4000000.0	USD
	us-gaap	Increase Decrease In Payables To Customers IncreaseDecreaseInPayablesToCustomers	855300000	USD
	us-gaap	Increase Decrease In Payables To Customers IncreaseDecreaseInPayablesToCustomers	942000000.0	USD
	us-gaap	Increase Decrease In Payables To Broker Dealers IncreaseDecreaseInPayablesToBrokerDealers	-16800000	USD
	us-gaap	Increase Decrease In Payables To Broker Dealers IncreaseDecreaseInPayablesToBrokerDealers	163000000.0	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-6000000.0	USD
	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	100000	USD
	us-gaap	Increase Decrease In Payables Under Repurchase Agreements IncreaseDecreaseInPayablesUnderRepurchaseAgreements	611700000	USD
	us-gaap	Increase Decrease In Payables Under Repurchase Agreements IncreaseDecreaseInPayablesUnderRepurchaseAgreements	26600000	USD
	us-gaap	Increase Decrease In Securities Loaned Transactions IncreaseDecreaseInSecuritiesLoanedTransactions	305300000	USD
	us-gaap	Increase Decrease In Securities Loaned Transactions IncreaseDecreaseInSecuritiesLoanedTransactions	-391100000	USD
	us-gaap	Increase Decrease In Financial Instruments Sold Not Yet Purchased IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased	432200000	USD
	us-gaap	Increase Decrease In Financial Instruments Sold Not Yet Purchased IncreaseDecreaseInFinancialInstrumentsSoldNotYetPurchased	-11200000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	665000000.0	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1170000000.0	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	400000	USD
	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	7800000	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	40000000.0	USD
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	4500000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-40400000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-12300000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	42800000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt Maturing In Three Months Or Less ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess	111600000	USD
	us-gaap	Proceeds From Short Term Debt Maturing In More Than Three Months ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths	120400000	USD
	us-gaap	Proceeds From Short Term Debt Maturing In More Than Three Months ProceedsFromShortTermDebtMaturingInMoreThanThreeMonths	311500000	USD
	us-gaap	Repayments Of Short Term Debt Maturing In More Than Three Months RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths	125400000	USD
	us-gaap	Repayments Of Short Term Debt Maturing In More Than Three Months RepaymentsOfShortTermDebtMaturingInMoreThanThreeMonths	350000000.0	USD
	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	0	USD
	us-gaap	Proceeds From Issuance Of Senior Long Term Debt ProceedsFromIssuanceOfSeniorLongTermDebt	21500000	USD
	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	4900000	USD
	us-gaap	Repayments Of Secured Debt RepaymentsOfSecuredDebt	4900000	USD
	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	9000000.0	USD
	us-gaap	Proceeds From Notes Payable ProceedsFromNotesPayable	0	USD
	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	0	USD
	us-gaap	Repayments Of Notes Payable RepaymentsOfNotesPayable	400000	USD
	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	800000	USD
	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	200000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	7500000	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	0	USD
	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1500000	USD
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	5300000	USD
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	4000000.0	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	46400000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	84100000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	12700000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-2700000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	683700000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1239100000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4468400000	USD
CY2019Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2451300000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5152100000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3690400000	USD
	us-gaap	Interest Paid Net InterestPaidNet	32900000	USD
	us-gaap	Interest Paid Net InterestPaidNet	64300000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	28200000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	13200000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	500000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Intangible Assets Acquired1 NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1	7200000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	100000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	352600000	USD
CY2020Q1	us-gaap	Cash Cash	519500000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	200000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	352000000.0	USD
	us-gaap	Noncash Or Part Noncash Acquisition Net Nonmonetary Assets Acquired Liabilities Assumed1 NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1	-100000	USD
	us-gaap	Noncash Or Part Noncash Acquisition Net Nonmonetary Assets Acquired Liabilities Assumed1 NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1	600000	USD
CY2021Q1	us-gaap	Cash Cash	1001500000	USD
CY2021Q1	us-gaap	Cash Segregated Under Commodity Exchange Act Regulation CashSegregatedUnderCommodityExchangeActRegulation	2000300000	USD
CY2020Q1	us-gaap	Cash Segregated Under Commodity Exchange Act Regulation CashSegregatedUnderCommodityExchangeActRegulation	1168000000.0	USD
CY2021Q1	intl	Cash Segregated And Deposited With Or Pledged To Exchange Clearing Organizations And Other Futures Commission Merchants CashSegregatedAndDepositedWithOrPledgedToExchangeClearingOrganizationsAndOtherFuturesCommissionMerchants	2050300000	USD
CY2020Q1	intl	Cash Segregated And Deposited With Or Pledged To Exchange Clearing Organizations And Other Futures Commission Merchants CashSegregatedAndDepositedWithOrPledgedToExchangeClearingOrganizationsAndOtherFuturesCommissionMerchants	1896700000	USD
CY2021Q1	us-gaap	Securities Segregated Under Other Regulations SecuritiesSegregatedUnderOtherRegulations	100000000.0	USD
CY2020Q1	us-gaap	Securities Segregated Under Other Regulations SecuritiesSegregatedUnderOtherRegulations	106200000	USD
CY2021Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	5152100000	USD
CY2020Q1	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3690400000	USD
CY2021Q1	intl	Noncashequivalentsegregatedassets Noncashequivalentsegregatedassets	102600000	USD
CY2020Q1	intl	Noncashequivalentsegregatedassets Noncashequivalentsegregatedassets	8100000	USD
CY2021Q1	intl	Nonsegregatedcashandothernoncashequivalentassetsincludedwithindepositsandreceivablesfrombrokerdealersclearingorganizationsandcounterparties Nonsegregatedcashandothernoncashequivalentassetsincludedwithindepositsandreceivablesfrombrokerdealersclearingorganizationsandcounterparties	2210900000	USD
CY2020Q1	intl	Nonsegregatedcashandothernoncashequivalentassetsincludedwithindepositsandreceivablesfrombrokerdealersclearingorganizationsandcounterparties Nonsegregatedcashandothernoncashequivalentassetsincludedwithindepositsandreceivablesfrombrokerdealersclearingorganizationsandcounterparties	1356600000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	614900000	USD
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	39300000	USD
CY2020Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-3400000	USD
CY2020Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	2500000	USD
CY2021Q1	us-gaap	Net Income Loss NetIncomeLoss	55300000	USD
CY2020Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	2400000	USD
CY2020Q1	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	7100000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	648600000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	799500000	USD
CY2021Q1	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1600000	USD
CY2021Q1	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	3600000	USD
CY2021Q1	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	3400000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	860200000	USD
CY2019Q3	us-gaap	Stockholders Equity StockholdersEquity	594200000	USD
	us-gaap	Net Income Loss NetIncomeLoss	55600000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2700000	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	4000000.0	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	5000000.0	USD
	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	7500000	USD
CY2020Q1	us-gaap	Stockholders Equity StockholdersEquity	648600000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	767500000	USD
	us-gaap	Net Income Loss NetIncomeLoss	74800000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	12300000	USD
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	5300000	USD
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6500000	USD
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	860200000	USD
CY2021Q1	intl	Number Of Commercial And Institutional Clients NumberOfCommercialAndInstitutionalClients	35000	client
CY2021Q1	intl	Number Retail Clients NumberRetailClients	340000	client
	us-gaap	Fiscal Period FiscalPeriod	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.
	us-gaap	Use Of Estimates UseOfEstimates	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 and investments, revenue recognition, the provision for bad debts, valuation of inventories, valuation of goodwill and intangible assets, income taxes, and contingencies. 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 and the unknown future impacts of the novel coronavirus (“COVID-19”) as of March 31, 2021 and through the date of this Form 10-Q.
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	During the year ended September 30, 2020, the Company reclassified certain selling and marketing related costs in connection with the acquisition of Gain Capital Holdings, Inc. (“Gain”). In performing this reclassification, the Company has made retrospective adjustments to the condensed consolidated income statements for the three and six months ended March 31, 2020.
CY2020Q1	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	4200000	USD
	us-gaap	Selling And Marketing Expense SellingAndMarketingExpense	5600000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	55300000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	39300000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	74800000	USD
	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	55600000	USD
CY2021Q1	intl	Undistributed Earnings Allocatedto Participating Securities Continuing Operations UndistributedEarningsAllocatedtoParticipatingSecuritiesContinuingOperations	1700000	USD
CY2020Q1	intl	Undistributed Earnings Allocatedto Participating Securities Continuing Operations UndistributedEarningsAllocatedtoParticipatingSecuritiesContinuingOperations	900000	USD
	intl	Undistributed Earnings Allocatedto Participating Securities Continuing Operations UndistributedEarningsAllocatedtoParticipatingSecuritiesContinuingOperations	2200000	USD
	intl	Undistributed Earnings Allocatedto Participating Securities Continuing Operations UndistributedEarningsAllocatedtoParticipatingSecuritiesContinuingOperations	1200000	USD
CY2021Q1	intl	Incomefromcontinuingoperationsallocatedtocommonshareholders Incomefromcontinuingoperationsallocatedtocommonshareholders	53600000	USD
CY2020Q1	intl	Incomefromcontinuingoperationsallocatedtocommonshareholders Incomefromcontinuingoperationsallocatedtocommonshareholders	38400000	USD
	intl	Incomefromcontinuingoperationsallocatedtocommonshareholders Incomefromcontinuingoperationsallocatedtocommonshareholders	72600000	USD
	intl	Incomefromcontinuingoperationsallocatedtocommonshareholders Incomefromcontinuingoperationsallocatedtocommonshareholders	54400000	USD
CY2021Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19112216	shares
CY2020Q1	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18872937	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	19025604	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	18811268	shares
CY2021Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	558323	shares
CY2020Q1	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	317016	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	544424	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	321229	shares
CY2021Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19670539	shares
CY2020Q1	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19189953	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19570028	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	19132497	shares
CY2021Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	212892	shares
CY2020Q1	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	945211	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	106368	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	981088	shares
CY2021Q1	us-gaap	Financial Instruments Sold Not Yet Purchased At Fair Value FinancialInstrumentsSoldNotYetPurchasedAtFairValue	1118200000	USD
CY2020Q3	us-gaap	Financial Instruments Sold Not Yet Purchased At Fair Value FinancialInstrumentsSoldNotYetPurchasedAtFairValue	686000000.0	USD
CY2021Q1	us-gaap	Senior Notes SeniorNotes	337100000	USD
CY2021Q1	us-gaap	Financial Instruments Sold Not Yet Purchased At Fair Value FinancialInstrumentsSoldNotYetPurchasedAtFairValue	1118200000	USD
CY2020Q3	us-gaap	Financial Instruments Sold Not Yet Purchased At Fair Value FinancialInstrumentsSoldNotYetPurchasedAtFairValue	686000000.0	USD
CY2021Q1	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	4622000000.0	USD
CY2021Q1	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	4606500000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	3264400000	USD
CY2020Q3	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	3069500000	USD
CY2021Q1	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	4527600000	USD
CY2021Q1	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	4351100000	USD
CY2020Q3	us-gaap	Derivative Asset Fair Value Gross Liability And Obligation To Return Cash Offset DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset	3319000000.0	USD
CY2020Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	3100700000	USD
CY2021Q1	us-gaap	Derivative Number Of Instruments Held DerivativeNumberOfInstrumentsHeld	10700000	contract
CY2020Q3	us-gaap	Derivative Number Of Instruments Held DerivativeNumberOfInstrumentsHeld	7900000	contract
CY2020Q3	intl	Allowance For Doubtful Accounts Depositswithand Receivablesfrom Broker Dealers Clearings Organizationsand Counterparties AllowanceForDoubtfulAccountsDepositswithandReceivablesfromBrokerDealersClearingsOrganizationsandCounterparties	1300000	USD
CY2021Q1	intl	Allowance For Doubtful Accounts Depositswithand Receivablesfrom Broker Dealers Clearings Organizationsand Counterparties AllowanceForDoubtfulAccountsDepositswithandReceivablesfromBrokerDealersClearingsOrganizationsandCounterparties	1300000	USD
CY2021Q1	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	33600000	USD
CY2020Q3	us-gaap	Allowance For Doubtful Accounts Receivable AllowanceForDoubtfulAccountsReceivable	25800000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	0	USD
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	0	USD
CY2020Q3	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	27100000	USD
	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	2400000	USD
	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions	2800000	USD
CY2021Q1	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	34900000	USD
CY2021Q1	us-gaap	Agricultural Related Inventory AgriculturalRelatedInventory	261800000	USD
CY2020Q3	us-gaap	Agricultural Related Inventory AgriculturalRelatedInventory	201500000	USD
CY2021Q1	us-gaap	Inventory Net InventoryNet	450800000	USD
CY2020Q3	us-gaap	Inventory Net InventoryNet	281100000	USD
CY2021Q1	us-gaap	Goodwill Goodwill	54500000	USD
CY2020Q3	us-gaap	Goodwill Goodwill	54700000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	70900000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	28800000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	42100000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	70900000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	21400000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	49500000	USD
CY2021Q1	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	5900000	USD
CY2021Q1	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	5900000	USD
CY2020Q3	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	5300000	USD
CY2020Q3	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	5300000	USD
CY2021Q1	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	76800000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	28800000	USD
CY2021Q1	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	48000000.0	USD
CY2020Q3	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	76200000	USD
CY2020Q3	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	21400000	USD
CY2020Q3	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	54800000	USD
CY2021Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3700000	USD
CY2020Q1	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1100000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	7500000	USD
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1900000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear	7600000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	13900000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	12200000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	4700000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	3700000	USD
CY2021Q1	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	42100000	USD
CY2021Q1	intl	Number Of Credit Facilities NumberOfCreditFacilities	4	facility
CY2021Q1	intl	Maximum Borrowing Capacity Under Credit Facilities MaximumBorrowingCapacityUnderCreditFacilities	771700000	USD
CY2021Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	3767200000	USD
	intl	Term Loan Initial Balance TermLoanInitialBalance	196500000	USD
	intl	Term Loan Periodic Principal Payment Percent TermLoanPeriodicPrincipalPaymentPercent	0.0125
	us-gaap	Debt Instrument Periodic Payment Principal DebtInstrumentPeriodicPaymentPrincipal	4900000	USD
CY2020Q4	us-gaap	Notes Payable To Bank NotesPayableToBank	9000000.0	USD
CY2020Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.0235
CY2020Q2	us-gaap	Debt Instrument Face Amount DebtInstrumentFaceAmount	350000000	USD
CY2020Q2	intl	Debt Instrument Discount Rate At Issuance Of Face Value DebtInstrumentDiscountRateAtIssuanceOfFaceValue	0.985
CY2021Q1	intl	Debt Instrument Discount Rate At Issuance Of Face Value DebtInstrumentDiscountRateAtIssuanceOfFaceValue	0.08625
CY2021Q1	us-gaap	Deferred Finance Costs Gross DeferredFinanceCostsGross	9500000	USD
CY2021Q1	intl	Maximum Borrowing Capacity Under Credit Facilities MaximumBorrowingCapacityUnderCreditFacilities	771700000	USD
CY2021Q1	intl	Amount Outstanding On Committed Credit Facilities AmountOutstandingOnCommittedCreditFacilities	455900000	USD
CY2020Q3	intl	Amount Outstanding On Committed Credit Facilities AmountOutstandingOnCommittedCreditFacilities	427600000	USD
CY2021Q1	us-gaap	Notes Payable To Bank NotesPayableToBank	8900000	USD
CY2020Q3	us-gaap	Notes Payable To Bank NotesPayableToBank	0	USD
CY2021Q1	us-gaap	Senior Notes SeniorNotes	337100000	USD
CY2020Q3	us-gaap	Senior Notes SeniorNotes	336000000.0	USD
CY2021Q1	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	826900000	USD
CY2020Q3	us-gaap	Collateralized Financings CollateralizedFinancings	4597400000	USD
CY2020Q3	us-gaap	Debt Longterm And Shortterm Combined Amount DebtLongtermAndShorttermCombinedAmount	783600000	USD
CY2021Q1	us-gaap	Financial Instruments Owned And Pledged As Collateral Amount Eligible To Be Repledged By Counterparty FinancialInstrumentsOwnedAndPledgedAsCollateralAmountEligibleToBeRepledgedByCounterparty	564700000	USD
CY2020Q3	us-gaap	Financial Instruments Owned And Pledged As Collateral Amount Eligible To Be Repledged By Counterparty FinancialInstrumentsOwnedAndPledgedAsCollateralAmountEligibleToBeRepledgedByCounterparty	468600000	USD
CY2021Q1	us-gaap	Pledged Financial Instruments Not Separately Reported Securities For Repurchase Agreements PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForRepurchaseAgreements	1818800000	USD
CY2020Q3	us-gaap	Pledged Financial Instruments Not Separately Reported Securities For Repurchase Agreements PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForRepurchaseAgreements	1484700000	USD
CY2021Q1	us-gaap	Securities Loaned Fair Value Of Collateral SecuritiesLoanedFairValueOfCollateral	1698900000	USD
CY2020Q3	us-gaap	Securities Loaned Fair Value Of Collateral SecuritiesLoanedFairValueOfCollateral	1410300000	USD
CY2021Q1	us-gaap	Fair Value Of Securities Received As Collateral That Can Be Resold Or Repledged FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledged	4110000000.0	USD
CY2020Q3	us-gaap	Fair Value Of Securities Received As Collateral That Can Be Resold Or Repledged FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledged	3303100000	USD
CY2021Q1	us-gaap	Fair Value Of Securities Received As Collateral That Have Been Resold Or Repledged FairValueOfSecuritiesReceivedAsCollateralThatHaveBeenResoldOrRepledged	339500000	USD
CY2020Q3	us-gaap	Fair Value Of Securities Received As Collateral That Have Been Resold Or Repledged FairValueOfSecuritiesReceivedAsCollateralThatHaveBeenResoldOrRepledged	285700000	USD
CY2021Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	3767200000	USD
CY2021Q1	us-gaap	Securities Loaned SecuritiesLoaned	1747200000	USD
CY2021Q1	us-gaap	Collateralized Financings CollateralizedFinancings	5514400000	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	3155500000	USD
CY2020Q3	us-gaap	Securities Loaned SecuritiesLoaned	1441900000	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	3155500000	USD
CY2021Q1	us-gaap	Securities Loaned SecuritiesLoaned	1747200000	USD
CY2020Q3	us-gaap	Securities Loaned SecuritiesLoaned	1441900000	USD
CY2021Q1	us-gaap	Collateralized Financings CollateralizedFinancings	5514400000	USD
CY2020Q3	us-gaap	Collateralized Financings CollateralizedFinancings	4597400000	USD
CY2021Q1	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	2297200000	USD
CY2021Q1	us-gaap	Securities Purchased Under Agreements To Resell Liability SecuritiesPurchasedUnderAgreementsToResellLiability	0	USD
CY2021Q1	us-gaap	Securities Purchased Under Agreements To Resell SecuritiesPurchasedUnderAgreementsToResell	2297200000	USD
CY2021Q1	us-gaap	Securities Borrowed Gross SecuritiesBorrowedGross	1735300000	USD
CY2021Q1	us-gaap	Securities Borrowed SecuritiesBorrowed	1735300000	USD
CY2021Q1	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	3767200000	USD
CY2021Q1	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	0	USD
CY2021Q1	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	3767200000	USD
CY2021Q1	us-gaap	Securities Loaned Gross SecuritiesLoanedGross	1747200000	USD
CY2021Q1	us-gaap	Securities Loaned SecuritiesLoaned	1747200000	USD
CY2020Q3	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1696200000	USD
CY2020Q3	us-gaap	Securities Purchased Under Agreements To Resell Liability SecuritiesPurchasedUnderAgreementsToResellLiability	0	USD
CY2020Q3	us-gaap	Securities Purchased Under Agreements To Resell SecuritiesPurchasedUnderAgreementsToResell	1696200000	USD
CY2020Q3	us-gaap	Securities Borrowed Gross SecuritiesBorrowedGross	1440000000.0	USD
CY2020Q3	us-gaap	Securities Borrowed SecuritiesBorrowed	1440000000.0	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	3155500000	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	0	USD
CY2020Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	3155500000	USD
CY2020Q3	us-gaap	Securities Loaned Gross SecuritiesLoanedGross	1441900000	USD
CY2020Q3	us-gaap	Securities Loaned SecuritiesLoaned	1441900000	USD
CY2021Q1	us-gaap	Loss Contingency Estimate Of Possible Loss LossContingencyEstimateOfPossibleLoss	28900000	USD
CY2021Q1	intl	Loss Contingency Individual Accounts Maximum Receivable LossContingencyIndividualAccountsMaximumReceivable	1400000	USD
CY2021Q1	us-gaap	Self Insurance Reserve SelfInsuranceReserve	1200000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	12300000	USD
CY2021Q1	intl	Revenues From Contracts With Clients Of Total Revenues RevenuesFromContractsWithClientsOfTotalRevenues	0.014
CY2020Q1	intl	Revenues From Contracts With Clients Of Total Revenues RevenuesFromContractsWithClientsOfTotalRevenues	0.007
	intl	Revenues From Contracts With Clients Of Total Revenues RevenuesFromContractsWithClientsOfTotalRevenues	0.014
	intl	Revenues From Contracts With Clients Of Total Revenues RevenuesFromContractsWithClientsOfTotalRevenues	0.008
CY2021Q1	intl	Revenues From Contracts With Clients Of Operating Revenues RevenuesFromContractsWithClientsOfOperatingRevenues	0.322
CY2020Q1	intl	Revenues From Contracts With Clients Of Operating Revenues RevenuesFromContractsWithClientsOfOperatingRevenues	0.379
	intl	Revenues From Contracts With Clients Of Operating Revenues RevenuesFromContractsWithClientsOfOperatingRevenues	0.346
	intl	Revenues From Contracts With Clients Of Operating Revenues RevenuesFromContractsWithClientsOfOperatingRevenues	0.385
CY2021Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	151900000	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	139200000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	294300000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	247700000	USD
CY2021Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	151900000	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	139200000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	294300000	USD
	us-gaap	Revenue From Contract With Customer Including Assessed Tax RevenueFromContractWithCustomerIncludingAssessedTax	247700000	USD
CY2021Q1	us-gaap	Principal Transactions Revenue PrincipalTransactionsRevenue	265200000	USD
CY2020Q1	us-gaap	Principal Transactions Revenue PrincipalTransactionsRevenue	168500000	USD
	us-gaap	Principal Transactions Revenue PrincipalTransactionsRevenue	468600000	USD
	us-gaap	Principal Transactions Revenue PrincipalTransactionsRevenue	281000000.0	USD
CY2021Q1	us-gaap	Interest Income Operating InterestIncomeOperating	23400000	USD
CY2020Q1	us-gaap	Interest Income Operating InterestIncomeOperating	41700000	USD
	us-gaap	Interest Income Operating InterestIncomeOperating	44600000	USD
	us-gaap	Interest Income Operating InterestIncomeOperating	87700000	USD
CY2021Q1	us-gaap	Revenues Revenues	11244800000	USD
CY2020Q1	us-gaap	Revenues Revenues	20366300000	USD
	us-gaap	Revenues Revenues	20495300000	USD
	us-gaap	Revenues Revenues	31611300000	USD
CY2021Q1	us-gaap	Revenues Revenues	11244800000	USD
CY2020Q1	us-gaap	Revenues Revenues	20366300000	USD
	us-gaap	Revenues Revenues	20495300000	USD
	us-gaap	Revenues Revenues	31611300000	USD
CY2021Q1	us-gaap	General Insurance Expense GeneralInsuranceExpense	1900000	USD
CY2020Q1	us-gaap	General Insurance Expense GeneralInsuranceExpense	1000000.0	USD
	us-gaap	General Insurance Expense GeneralInsuranceExpense	3700000	USD
	us-gaap	General Insurance Expense GeneralInsuranceExpense	2000000.0	USD
CY2021Q1	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	400000	USD
CY2020Q1	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	500000	USD
	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	700000	USD
	us-gaap	Supplies And Postage Expense SuppliesAndPostageExpense	900000	USD
CY2021Q1	us-gaap	Clearance Fees ClearanceFees	1000000.0	USD
CY2020Q1	us-gaap	Clearance Fees ClearanceFees	600000	USD
	us-gaap	Clearance Fees ClearanceFees	2000000.0	USD
	us-gaap	Clearance Fees ClearanceFees	1400000	USD
CY2021Q1	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	3500000	USD
CY2020Q1	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	1300000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	7300000	USD
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	2600000	USD
CY2021Q1	us-gaap	Accretion Expense AccretionExpense	800000	USD
CY2020Q1	us-gaap	Accretion Expense AccretionExpense	100000	USD
	us-gaap	Accretion Expense AccretionExpense	900000	USD
	us-gaap	Accretion Expense AccretionExpense	100000	USD
CY2021Q1	us-gaap	Other Expenses OtherExpenses	4500000	USD
CY2020Q1	us-gaap	Other Expenses OtherExpenses	2900000	USD
	us-gaap	Other Expenses OtherExpenses	8600000	USD
	us-gaap	Other Expenses OtherExpenses	5500000	USD
CY2020Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.30
CY2021Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	12100000	USD
CY2020Q1	us-gaap	Other Noninterest Expense OtherNoninterestExpense	6400000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	23200000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	12500000	USD
CY2021Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	21000000.0	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	16800000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28400000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	22200000	USD
CY2021Q1	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.28
CY2021Q1	us-gaap	Revenues Net Of Interest Expense RevenuesNetOfInterestExpense	334200000	USD
CY2021Q1	srt	Minimum Net Capital Required For Broker Dealer Subsidiary1 MinimumNetCapitalRequiredForBrokerDealerSubsidiary1	5000000	USD
CY2021Q1	srt	Minimum Net Capital Required For Broker Dealer Subsidiary1 MinimumNetCapitalRequiredForBrokerDealerSubsidiary1	5000000.0	USD
CY2021Q1	dei	Entity Number Of Employees EntityNumberOfEmployees	3000	employee
CY2021Q1	us-gaap	Number Of Countries In Which Entity Operates NumberOfCountriesInWhichEntityOperates	180	country
CY2021Q1	us-gaap	Revenues Revenues	11244800000	USD
CY2020Q1	us-gaap	Revenues Revenues	20366300000	USD
	us-gaap	Revenues Revenues	20495300000	USD
	us-gaap	Revenues Revenues	31611300000	USD
CY2021Q1	us-gaap	Gross Profit GrossProfit	471400000	USD
CY2020Q1	us-gaap	Gross Profit GrossProfit	366800000	USD
	us-gaap	Gross Profit GrossProfit	851500000	USD
	us-gaap	Gross Profit GrossProfit	643600000	USD
CY2020Q1	us-gaap	Revenues Net Of Interest Expense RevenuesNetOfInterestExpense	243400000	USD
	us-gaap	Revenues Net Of Interest Expense RevenuesNetOfInterestExpense	590300000	USD
	us-gaap	Revenues Net Of Interest Expense RevenuesNetOfInterestExpense	413900000	USD
CY2021Q1	intl	Net Segment Contribution NetSegmentContribution	248300000	USD
CY2020Q1	intl	Net Segment Contribution NetSegmentContribution	174900000	USD
	intl	Net Segment Contribution NetSegmentContribution	446900000	USD
	intl	Net Segment Contribution NetSegmentContribution	300700000	USD
CY2021Q1	intl	Segment Income SegmentIncome	159000000.0	USD
CY2020Q1	intl	Segment Income SegmentIncome	117300000	USD
	intl	Segment Income SegmentIncome	274200000	USD
	intl	Segment Income SegmentIncome	193100000	USD
CY2021Q1	intl	Segment Income SegmentIncome	159000000.0	USD
CY2020Q1	intl	Segment Income SegmentIncome	117300000	USD
	intl	Segment Income SegmentIncome	274200000	USD
	intl	Segment Income SegmentIncome	193100000	USD
CY2021Q1	intl	Costsnotallocatedtooperatingsegments Costsnotallocatedtooperatingsegments	82700000	USD
CY2020Q1	intl	Costsnotallocatedtooperatingsegments Costsnotallocatedtooperatingsegments	61200000	USD
	intl	Costsnotallocatedtooperatingsegments Costsnotallocatedtooperatingsegments	171000000.0	USD
	intl	Costsnotallocatedtooperatingsegments Costsnotallocatedtooperatingsegments	115400000	USD
CY2021Q1	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	0	USD
CY2020Q1	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	0	USD
	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	0	USD
	us-gaap	Other Nonoperating Gains Losses OtherNonoperatingGainsLosses	100000	USD
CY2021Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	76300000	USD
CY2020Q1	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	56100000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	103200000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	77800000	USD
CY2021Q1	us-gaap	Assets Assets	15799700000	USD
CY2020Q3	us-gaap	Assets Assets	13474900000	USD

Files In Submission

Name	View Source	Status
0000913760-21-000077-index-headers.html	Edgar Link	pending
0000913760-21-000077-index.html	Edgar Link	pending
0000913760-21-000077.txt	Edgar Link	pending
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intl-20210331.xsd	Edgar Link	pending
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$SNEX
StoneX Group Inc. Stock $snex

2021 Q1 Form 10-Q Financial Statement

#000091376021000077 Filed on May 10, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SNEX StoneX Group Inc. Stock $snex

2021 Q1 Form 10-Q Financial Statement

#000091376021000077 Filed on May 10, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$SNEX
StoneX Group Inc. Stock $snex