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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2025 | Sep. 30, 2024
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Statement of Financial Position [Abstract] |  |
Cash, securities and other assets segregated under federal and other regulations at fair value | $ 950.0 | $ 51.8
Deposits with and receivables from broker-dealers, clearing organizations and counterparties at fair value | 6,442.9 | 3,287.5
Receivables from clients at fair value | 58.1 | (8.4)
Financial instruments owned, securities pledged as collateral that can be sold or repledged | 1,165.8 | 2,172.0
Physical commodities inventory at fair value | 471.1 | 376.6
Accounts payable and other accrued liabilities at fair value | 32.3 | 2.3
Payables to client at fair value | 530.7 | 265.9
Payables to broker-dealers, clearing organizations and counterparties at fair value | $ 38.4 | $ (1.4)
Preferred stock, par value (in dollar per share) | $ 0.01 | $ 0.01
Preferred stock, authorized (in shares) | 1,000,000 | 1,000,000
Preferred stock, issued (in shares) | 0 | 0
Preferred stock, outstanding (in shares) | 0 | 0
Common stock, par value (in dollar per share) | $ 0.01 | $ 0.01
Common stock, authorized (in shares) | 200,000,000 | 200,000,000
Common stock, issued (in shares) | 54,967,558 | 53,678,016
Common stock, outstanding (in shares) | 52,186,635 | 47,811,539
Common stock in treasury (in shares) | 2,780,923 | 5,866,477

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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