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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Cash flows from operating activities: |  |  |
Net income |  | $ 69.1 | $ 76.6
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization |  | 11.2 | 12.7
Amortization of right of use assets |  | 3.2 | 3.4
Bad debts (recoveries), net |  | (0.3) | 0.7
Deferred income taxes |  | 1.5 | 4.0
Amortization of debt issuance costs |  | 1.5 | 1.2
Amortization of share-based compensation |  | 7.6 | 5.5
Gain on acquisition |  | 0.0 | (23.5)
Changes in operating assets and liabilities, net: |  |  |
Securities and other assets segregated under federal and other regulations |  | 2.3 | 585.4
Securities purchased under agreements to resell |  | (820.3) | (1,081.2)
Securities borrowed |  | 134.6 | 725.6
Deposits with and receivables from broker-dealers, clearing organizations, and counterparties, net |  | (206.8) | 1,318.9
Receivables from clients, net |  | (142.2) | 21.5
Notes receivable, net |  | (0.1) | 0.0
Income taxes receivable |  | 4.2 | 10.0
Financial instruments owned, at fair value |  | (11.1) | (221.1)
Physical commodities inventory, net |  | 18.9 | (76.7)
Other assets |  | (44.8) | (27.5)
Accounts payable and other accrued liabilities |  | (87.0) | (65.5)
Operating lease liabilities |  | 1.0 | 1.2
Payables to clients |  | 72.6 | (681.3)
Payables to broker-dealers, clearing organizations, and counterparties |  | 99.1 | (325.4)
Income taxes payable |  | 3.7 | 8.2
Securities sold under agreements to repurchase |  | 1,527.6 | 1,724.0
Securities loaned |  | (174.6) | (705.6)
Financial instruments sold, not yet purchased, at fair value |  | (318.5) | (244.4)
Net cash provided by operating activities |  | 152.4 | 1,046.7
Cash flows from investing activities: |  |  |
Acquisition of businesses and assets, net of cash received |  | 0.0 | (6.5)
Purchases of property and equipment |  | (12.7) | (11.3)
Net cash used in investing activities |  | (12.7) | (17.8)
Cash flows from financing activities: |  |  |
Net change in payables to lenders under loans with maturities 90 days or less |  | 77.5 | 122.1
Proceeds from payables to lenders under loans with maturities greater than 90 days |  | 0.0 | 110.0
Repayments of payables to lenders under loans with maturities greater than 90 days |  | 0.0 | (145.0)
Shares withheld to cover taxes on vesting of equity awards |  | (1.1) | 0.0
Exercise of stock options |  | 0.5 | 1.5
Net cash provided by financing activities |  | 76.9 | 88.6
Effect of exchange rates on cash, segregated cash, cash equivalents, and segregated cash equivalents |  | 6.8 | 8.1
Net increase in cash, segregated cash, cash equivalents, and segregated cash equivalents |  | 223.4 | 1,125.6
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 |  | 6,265.1 | 7,410.7
Supplemental disclosure of cash flow information: |  |  |
Cash paid for interest |  | 281.5 | 164.9
Income taxes paid, net of cash refunds |  | 18.4 | (3.5)
Supplemental disclosure of non-cash investing and financing activities: |  |  |
Identified intangible assets and goodwill on acquisitions |  | 0.0 | 8.9
Acquisition of business: |  |  |
Assets acquired |  | 0.0 | 139.5
Liabilities assumed |  | 0.0 | 82.2
Total net assets acquired |  | 0.0 | 57.3
Cash and cash equivalents |  | 1,157.6 | 1,252.1
Cash segregated under federal and other regulations | [1] | 2,771.1 | 2,298.6
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] | 1,455.3 | 2,141.0
Securities segregated and pledged to exchange-clearing organizations | [2] | 881.1 | 1,718.9
Total cash, segregated cash, cash equivalents, and segregated cash equivalents shown in the condensed consolidated statements of cash flows |  | 6,265.1 | 7,410.7
Non-cash equivalent segregated assets |  | 3.5 | 19.9
Non-segregated cash and other non-cash equivalent assets included within deposits and receivables from broker-dealers, clearing organizations, and counterparties |  | $ 5,137.7 | $ 3,016.3
[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 $3.5 million and $19.9 million as of December 31, 2023 and 2022, 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 $5,137.7 million and $3,016.3 million as of December 31, 2023 and 2022, 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 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 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 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 Reference 2: 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 Reference 3: 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 + 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 -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-15 + Details
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