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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
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