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Basis of Presentation and Consolidation and Accounting Standards Adopted (Details) $ / shares in Units, client in Thousands, $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended
	Nov. 07, 2023	Oct. 31, 2022 USD ($)	Jun. 30, 2024 USD ($) country client $ / shares	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) country client $ / shares	Jun. 30, 2023 USD ($)	Sep. 30, 2023 $ / shares
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of countries in which entity operates (more than) | country			180		180
Number of commercial and institutional clients (more than) | client			54		54
Number of retail clients | client			400		400
Stock split, conversion ratio	1.5
Common stock - par value (in dollars per share) | $ / shares			$ 0.01		$ 0.01		$ 0.01
Gain on acquisition			$ 0.0	$ 0.0	$ 0.0	$ 23.5
Cotton Distributors Inc.
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Fair value of identifiable net assets acquired		$ 66.2
Purchase price		$ 42.7
Gain on acquisition						$ 23.5
Retail Segment
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of countries in which entity operates (more than) | country			180		180

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