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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Cash flows from operating activities: |  |  |
Net income |  | $ 184.1 | $ 187.8
Adjustments to reconcile net income to net cash provided by/(used in) operating activities: |  |  |
Depreciation and amortization |  | 35.8 | 39.6
Amortization of right of use assets |  | 16.4 | 7.9
Bad debts (recoveries), net |  | (0.2) | 10.0
Deferred income taxes |  | (3.6) | 3.2
Amortization of debt issuance costs |  | 7.9 | 4.3
Amortization of share-based compensation |  | 27.8 | 21.3
Gain on acquisition |  | 0.0 | (23.5)
Changes in operating assets and liabilities, net: |  |  |
Securities and other assets segregated under federal and other regulations |  | (42.6) | 600.6
Securities purchased under agreements to resell |  | (1,925.3) | (970.0)
Securities borrowed |  | (26.6) | 115.5
Deposits with and receivables from broker-dealers, clearing organizations, and counterparties, net |  | (183.8) | (1,072.7)
Receivables from clients, net |  | (188.1) | (89.8)
Notes receivable, net |  | 0.0 | (0.2)
Income taxes receivable |  | (3.8) | (5.3)
Financial instruments owned, at fair value |  | (1,106.8) | (1,112.6)
Physical commodities inventory, net |  | (50.1) | 91.3
Other assets |  | (84.7) | (44.5)
Accounts payable and other accrued liabilities |  | 20.6 | 23.5
Operating lease liabilities |  | (7.3) | (0.5)
Payables to clients |  | 610.2 | (170.7)
Payables to broker-dealers, clearing organizations, and counterparties |  | (13.2) | (26.6)
Income taxes payable |  | (13.6) | 18.8
Securities sold under agreements to repurchase |  | 2,545.3 | 1,833.9
Securities loaned |  | 6.7 | (96.2)
Financial instruments sold, not yet purchased, at fair value |  | 509.2 | 260.1
Net cash provided by/(used in) operating activities |  | 314.3 | (394.8)
Cash flows from investing activities: |  |  |
Proceeds from notes receivable |  | 5.2 | 0.0
Acquisition of businesses and assets, net of cash received |  | (0.7) | (6.1)
Purchase of exchange memberships and common stock |  | (1.0) | 0.0
Purchases of property and equipment |  | (48.5) | (32.8)
Net cash used in investing activities |  | (45.0) | (38.9)
Cash flows from financing activities: |  |  |
Net change in payables to lenders under loans with maturities 90 days or less |  | (113.2) | (37.7)
Proceeds from payables to lenders under loans with maturities greater than 90 days |  | 10.0 | 170.0
Repayments of payables to lenders under loans with maturities greater than 90 days |  | (10.0) | (205.0)
Proceeds from issuance of senior secured notes |  | 550.0 | 0.0
Repayment of senior secured notes |  | (347.9) | 0.0
Deferred payments on acquisitions |  | (9.6) | (18.5)
Debt issuance costs |  | (7.6) | 0.0
Shares withheld to cover taxes on vesting of equity awards |  | (2.0) | 0.0
Exercise of stock options |  | 4.5 | 3.6
Net cash provided by/(used in) financing activities |  | 74.2 | (87.6)
Effect of exchange rates on cash, segregated cash, cash equivalents, and segregated cash equivalents |  | (6.9) | 14.8
Net increase/(decrease) in cash, segregated cash, cash equivalents, and segregated cash equivalents |  | 336.6 | (506.5)
Cash, segregated cash, cash equivalents, and segregated cash equivalents at beginning of period |  | 6,041.7 | 6,285.1
Cash, segregated cash, cash equivalents, and segregated cash equivalents at end of period |  | 6,378.3 | 5,778.6
Supplemental disclosure of cash flow information: |  |  |
Cash paid for interest |  | 848.7 | 550.8
Income taxes paid, net of cash refunds |  | 89.1 | 41.9
Supplemental disclosure of non-cash investing and financing activities: |  |  |
Additional consideration payable related to acquisition of customer list |  | 0.6 | 0.0
Identified intangible assets and goodwill on acquisitions |  | 0.0 | 10.6
Additional consideration payable related to acquisitions, net |  | 3.5 | 28.7
Acquisition of business: |  |  |
Assets acquired |  | 0.0 | 141.6
Liabilities assumed |  | 0.0 | 84.1
Total net assets acquired |  | 0.0 | 57.5
Cash and cash equivalents |  | 1,220.8 | 1,401.3
Cash segregated under federal and other regulations | [1] | 2,702.0 | 2,487.5
Securities segregated under federal and other regulations | [1] | 0.0 | 0.1
Cash segregated and deposited with or pledged to exchange-clearing organizations and other futures commission merchants (“FCMs”) | [2] | 1,535.1 | 1,499.2
Securities segregated and pledged to exchange-clearing organizations | [2] | 920.4 | 390.5
Total cash, segregated cash, cash equivalents, and segregated cash equivalents shown in the condensed consolidated statements of cash flows |  | 6,378.3 | 5,778.6
Non-cash equivalent segregated assets |  | 48.4 | 4.8
Non-segregated cash and other non-cash equivalent assets included within deposits and receivables from broker-dealers, clearing organizations, and counterparties |  | $ 5,114.7 | $ 5,408.0
[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 $48.4 million and $4.8 million as of June 30, 2024 and 2023, respectively, included within Cash, securities and other assets segregated under federal and other regulations on the Condensed Consolidated Balance Sheets.
[2] | 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 $5,114.7 million and $5,408.0 million as of June 30, 2024 and 2023, respectively, included within Deposits with and receivables from broker-dealers, clearing organizations, and counterparties, net on the Condensed Consolidated Balance Sheets.

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- Definition The total amount of [all] liabilities that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-3 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-5 + Details
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- Definition Amount of periodic reduction over lease term of carrying amount of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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- Definition The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 13 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
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- Definition The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 + Details
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- Definition The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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- Definition The cash inflow from a borrowing net of the cash outflow from repayment of a borrowing having initial term of repayment within three months. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 9 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-9 + Details
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- Definition The cash inflow from a borrowing having initial term of repayment of more than three months but less than one year or one operating cycle (if the normal cycle is more than one year). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 + Details
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- Definition Amount of cash inflow from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-14 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2A -Subparagraph (a) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2A + Details
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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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- Definition The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition The cash outflow from a repayment of a borrowing having initial term of repayment of more than three months but less than one year or one operating cycle (if the normal cycle is more than one year). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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