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Revenue from Contracts with Clients - Schedule of Principal Gains, Net Related To Income and Expense of Dividends (Details) - Equity securities - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Dividend (loss)/income, net reported within Principal gains, net	$ (2.0)	$ (1.4)	$ (0.7)	$ 1.1
Dividend income on long equity positions
Disaggregation of Revenue [Line Items]
Dividend (loss)/income, net reported within Principal gains, net	35.8	77.7	108.7	163.7
Dividend expense on short equity positions
Disaggregation of Revenue [Line Items]
Dividend (loss)/income, net reported within Principal gains, net	$ (37.8)	$ (79.1)	$ (109.4)	$ (162.6)

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Dividend Income (Expense), Net

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