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Condensed Financial Information of Parent Company Only Disclosure - Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 77.4 | $ 36.6 | $ 39.3 | $ 16.3 | $ 27.2 | $ 16.3 | $ 23.4 | $ 18.2 | $ 169.6 | $ 85.1 | $ 55.5
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |
Amortization of operating right of use assets |  |  |  |  |  |  |  |  | 9.9 |  |
Deferred income taxes |  |  |  |  |  |  |  |  | 4.1 | 3.7 | 22.3
Amortization and extinguishment of debt issuance costs |  |  |  |  |  |  |  |  | 6.5 | 1.5 | 1.0
Amortization of share-based compensation expense |  |  |  |  |  |  |  |  | 10.3 | 8.1 | 6.6
Gain on acquisition | (81.8) |  |  |  |  |  | $ (5.4) |  |  |  |
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Income taxes receivable |  |  |  |  |  |  |  |  | (11.1) | (4.2) | (1.3)
Financial instruments owned, at fair value |  |  |  |  |  |  |  |  | (552.5) | (113.3) | (308.7)
Other assets |  |  |  |  |  |  |  |  | (3.7) | (8.3) | (3.3)
Accounts payable and other accrued liabilities |  |  |  |  |  |  |  |  | 42.7 | 6.7 | 18.6
Payable to clients |  |  |  |  |  |  |  |  | 2,093.7 | (46.8) | 520.0
Financial instruments sold, not yet purchased, at fair value |  |  |  |  |  |  |  |  | (28.8) | (156.1) | 153.9
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 1,950.6 | 195.6 | (473.6)
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Purchase of property and equipment |  |  |  |  |  |  |  |  | (16.6) | (11.9) | (12.5)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (241.6) | (40.8) | (15.4)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Repayments of note payable |  |  |  |  |  |  |  |  | (0.4) | (0.8) | (0.8)
Repayments of senior secured term loan |  |  |  |  |  |  |  |  | (9.8) | (6.6) | 0.0
Repayment of senior secured notes |  |  |  |  |  |  |  |  | (92.1) | 0.0 | 0.0
Share repurchase |  |  |  |  |  |  |  |  | (7.5) | (3.8) | 0.0
Debt issuance costs |  |  |  |  |  |  |  |  | (15.0) | (3.3) | (0.4)
Exercise of stock options |  |  |  |  |  |  |  |  | 5.5 | 1.2 | 2.6
Withholding taxes on stock option exercises |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.8)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 312.3 | 9.6 | 120.9
Net increase (decrease) in cash, segregated cash, cash equivalents, and segregated cash equivalents |  |  |  |  |  |  |  |  | 2,017.1 | 163.7 | (372.2)
Cash, segregated cash, cash equivalents, and segregated cash equivalents at beginning of period |  |  |  | 2,451.3 |  |  |  | 2,287.6 | 2,451.3 | 2,287.6 | 2,659.8
Cash, segregated cash, cash equivalents, and segregated cash equivalents at end of period | 4,468.4 |  |  |  | 2,451.3 |  |  |  | 4,468.4 | 2,451.3 | 2,287.6
Cash paid for interest |  |  |  |  |  |  |  |  | 90.4 | 153.2 | 78.9
Income taxes (received) paid, net of cash refunds |  |  |  |  |  |  |  |  | 44.0 | 24.6 | 22.2
Additional consideration payable related to acquisitions |  |  |  |  |  |  |  |  | 0.9 |  |
StoneX Group [Member] |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 88.2 | 15.3 | (37.2)
Adjustments to reconcile net income to net cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 6.7 | 5.2 | 4.8
Amortization of operating right of use assets |  |  |  |  |  |  |  |  | 4.4 |  |
Deferred income taxes |  |  |  |  |  |  |  |  | 0.0 | 0.6 | 18.0
Amortization and extinguishment of debt issuance costs |  |  |  |  |  |  |  |  | 6.1 | 1.2 | 0.7
Amortization of share-based compensation expense |  |  |  |  |  |  |  |  | 9.2 | 7.1 | 6.1
Impairment |  |  |  |  |  |  |  |  | 2.5 | 0.0 | 0.0
Gain on acquisition |  |  |  |  |  |  |  |  | (81.9) | (5.4) | 0.0
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Due to/from subsidiaries |  |  |  |  |  |  |  |  | 149.3 | 8.3 | (69.4)
Receivables from clients, net |  |  |  |  |  |  |  |  | 0.1 | (0.5) | 0.0
Notes receivable, net |  |  |  |  |  |  |  |  | 1.1 | (1.0) | 2.9
Income taxes receivable |  |  |  |  |  |  |  |  | (48.4) | (0.8) | (6.6)
Financial instruments owned, at fair value |  |  |  |  |  |  |  |  | 0.0 | 4.4 | (4.4)
Other assets |  |  |  |  |  |  |  |  | (7.7) | (4.4) | (0.7)
Accounts payable and other accrued liabilities |  |  |  |  |  |  |  |  | 24.0 | 4.6 | 8.6
Operating lease liabilities |  |  |  |  |  |  |  |  | (2.8) |  |
Payable to clients |  |  |  |  |  |  |  |  | 0.0 | (1.4) | (0.3)
Financial instruments sold, not yet purchased, at fair value |  |  |  |  |  |  |  |  | (83.4) | 25.2 | 34.0
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 67.4 | 58.4 | (43.5)
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Capital contribution in affiliates |  |  |  |  |  |  |  |  | (251.9) | (75.8) | (4.5)
Purchase of property and equipment |  |  |  |  |  |  |  |  | (10.2) | (6.2) | (5.9)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (262.1) | (82.0) | (10.4)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Net change in lenders under loans |  |  |  |  |  |  |  |  | (47.0) | (138.2) | 58.2
Repayments of note payable |  |  |  |  |  |  |  |  | (0.4) | (0.8) | (0.8)
Proceeds from issuance of senior secured term loan |  |  |  |  |  |  |  |  | 21.5 | 175.0 | 0.0
Repayments of senior secured term loan |  |  |  |  |  |  |  |  | (9.8) | (6.6) | 0.0
Proceeds from issuance of senior secured notes |  |  |  |  |  |  |  |  | 344.8 | 0.0 | 0.0
Repayment of senior secured notes |  |  |  |  |  |  |  |  | (92.1) | 0.0 | 0.0
Deferred payments on acquisitions |  |  |  |  |  |  |  |  | (0.9) | 0.0 | (5.5)
Share repurchase |  |  |  |  |  |  |  |  | (7.5) | (3.8) | 0.0
Debt issuance costs |  |  |  |  |  |  |  |  | (14.0) | (3.0) | 0.0
Exercise of stock options |  |  |  |  |  |  |  |  | 5.5 | 1.2 | 2.6
Withholding taxes on stock option exercises |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (0.8)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 200.1 | 23.8 | 53.7
Net increase (decrease) in cash, segregated cash, cash equivalents, and segregated cash equivalents |  |  |  |  |  |  |  |  | 5.4 | 0.2 | (0.2)
Cash, segregated cash, cash equivalents, and segregated cash equivalents at beginning of period |  |  |  | $ 2.0 |  |  |  | $ 1.8 | 2.0 | 1.8 | 2.0
Cash, segregated cash, cash equivalents, and segregated cash equivalents at end of period | $ 7.4 |  |  |  | $ 2.0 |  |  |  | 7.4 | 2.0 | 1.8
Cash paid for interest |  |  |  |  |  |  |  |  | 15.3 | 18.9 | 15.0
Income taxes (received) paid, net of cash refunds |  |  |  |  |  |  |  |  | (4.3) | (23.9) | (18.4)
Additional consideration payable related to acquisitions |  |  |  |  |  |  |  |  | $ 21.6 | $ 1.8 | $ 0.0

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