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Condensed Financial Information of Parent Company Only Disclosure - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities:      
Net income $ 305.9 $ 260.8 $ 238.5
Adjustments to reconcile net income to net cash (used in)/provided by operating activities:      
Depreciation and amortization 67.5 53.1 51.0
Amortization of operating right of use assets 31.5 21.5 14.0
Deferred income taxes 7.3 (10.5) (2.4)
Amortization and extinguishment of debt issuance costs 4.7 5.4 5.8
Loss on extinguishment of debt 0.0 3.7 0.0
Amortization of share-based compensation expense 49.0 37.2 28.0
Accretion of deferred consideration 1.1 0.0 0.0
Loss on disposal of property and equipment 2.3 0.0 0.0
Changes in operating assets and liabilities:      
Receivable from clients, net (285.5) (330.3) (80.5)
Deposits with and receivables from subsidiary broker-dealer, net 182.6 262.5 (595.6)
Income taxes receivable (19.7) 7.2 (13.4)
Financial instruments owned, at fair value (1,801.5) (1,714.4) (857.9)
Other assets (62.3) (119.8) (60.4)
Accounts payable and other accrued liabilities 108.4 (5.3) 82.5
Operating lease liabilities (25.5) (9.8) (8.0)
Payable to broker-dealers, clearing organizations and counterparties 229.2 291.8 (217.8)
Financial instruments sold, not yet purchased, at fair value 66.5 (205.4) 658.4
Net cash provided by/(used in) operating activities 4,388.3 506.9 (23.7)
Cash flows from investing activities:      
Collection of notes receivable 0.0 5.0 0.0
Purchase of property and equipment and internally developed software (65.4) (65.2) (46.9)
Net cash used in investing activities (465.5) (63.7) (53.0)
Cash flows from financing activities:      
Net change in lenders under loans with maturities 90 days or less 317.4 (2.2) (119.3)
Repayments of senior secured notes 0.0 (347.9) 0.0
Proceeds from issuance of senior secured notes 625.0 550.0 0.0
Deferred payments on acquisitions (21.2) (9.6) (18.7)
Debt issuance costs (10.5) (7.7) 0.0
Shares withheld to cover taxes on vesting of equity awards (6.6) (2.3) 0.0
Exercise of stock options 10.7 7.7 3.7
Net cash provided by/(used in) financing activities 914.8 188.0 (169.3)
Net increase/(decrease) in cash, segregated cash, cash equivalents, and segregated cash equivalents 4,847.6 630.9 (243.4)
Cash, segregated cash, cash equivalents, and segregated cash equivalents at beginning of period 6,672.6 6,041.7 6,285.1
Cash, segregated cash, cash equivalents, and segregated cash equivalents at end of period 11,520.2 6,672.6 6,041.7
Supplemental disclosure of cash flow information:      
Cash paid for interest 1,461.5 1,230.2 786.5
Income taxes (received)/paid, net of cash refunds 118.2 117.8 71.0
StoneX Group      
Cash flows from operating activities:      
Net income 305.9 260.8 238.5
Adjustments to reconcile net income to net cash (used in)/provided by operating activities:      
Equity earnings of subsidiaries (512.7) (428.8) (370.5)
Depreciation and amortization 18.0 16.6 13.7
Amortization of operating right of use assets 6.0 5.7 5.8
Deferred income taxes (0.7) (3.2) (3.6)
Amortization and extinguishment of debt issuance costs 2.6 3.8 3.9
Loss on extinguishment of debt 0.0 3.7 0.0
Amortization of share-based compensation expense 44.2 33.6 26.2
Accretion of deferred consideration 1.0 0.0 0.0
Loss on disposal of property and equipment 2.2 0.0 0.0
Changes in operating assets and liabilities:      
Cash dividends from subsidiaries 178.1 224.7 268.4
Receivables from subsidiaries, net (149.4) (7.9) 0.0
Payable to subsidiaries, net 38.1 (245.1) 11.0
Receivable from clients, net 0.0 0.0 0.2
Deposits with and receivables from subsidiary broker-dealer, net 2.0 75.0 12.1
Income taxes receivable (3.2) (3.9) (76.6)
Financial instruments owned, at fair value 0.1 5.9 (0.8)
Other assets (43.6) (5.1) (5.7)
Accounts payable and other accrued liabilities 97.4 (34.8) 45.8
Operating lease liabilities (6.7) (4.9) (4.5)
Payable to broker-dealers, clearing organizations and counterparties 7.3 0.0 0.0
Financial instruments sold, not yet purchased, at fair value 0.0 0.1 (3.1)
Net cash provided by/(used in) operating activities (13.4) (103.8) 160.8
Cash flows from investing activities:      
Capital contribution to and investment in affiliates (740.0) (56.3) (40.0)
Collection of notes receivable 0.0 5.0 0.0
Purchase of property and equipment and internally developed software (11.4) (11.5) (17.9)
Net cash used in investing activities (751.4) (62.8) (57.9)
Cash flows from financing activities:      
Net change in lenders under loans with maturities 90 days or less 155.4 10.4 (110.6)
Repayments of senior secured notes 0.0 (347.9) 0.0
Proceeds from issuance of senior secured notes 625.0 550.0 0.0
Deferred payments on acquisitions (20.1) (23.6) 0.0
Debt issuance costs (10.5) (7.7) 0.0
Shares withheld to cover taxes on vesting of equity awards (6.6) 0.0 0.0
Exercise of stock options 10.7 5.4 3.7
Net cash provided by/(used in) financing activities 753.9 186.6 (106.9)
Net increase/(decrease) in cash, segregated cash, cash equivalents, and segregated cash equivalents (10.9) 20.0 (4.0)
Cash, segregated cash, cash equivalents, and segregated cash equivalents at beginning of period 22.1 2.1 6.1
Cash, segregated cash, cash equivalents, and segregated cash equivalents at end of period 11.2 22.1 2.1
Supplemental disclosure of cash flow information:      
Cash paid for interest 71.1 26.5 15.3
Income taxes (received)/paid, net of cash refunds (59.0) 21.3 34.9
Non-cash dividends received from subsidiaries $ 47.1 $ 48.1 $ 12.7