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Regulatory Requirements and Subsidiary Dividend Restrictions - Customer Reserve Requirements - Narrative (Details) - USD ($) $ in Millions	Oct. 02, 2024	Sep. 30, 2024
Capital and Other Regulatory Requirements [Line Items]
Cash reserve deposit required		$ 87.7
Customer SRBA
Capital and Other Regulatory Requirements [Line Items]
Cash reserve deposit required		30.8
Customer SRBA | Subsequent Event
Capital and Other Regulatory Requirements [Line Items]
Cash reserve deposit made	$ 55.1
PAB
Capital and Other Regulatory Requirements [Line Items]
Cash reserve deposit required		7.7
PAB Reserve Requirement
Capital and Other Regulatory Requirements [Line Items]
Cash reserve deposit required		7.7
PAB SRBA
Capital and Other Regulatory Requirements [Line Items]
Cash reserve deposit required		$ 12.5
PAB SRBA | Subsequent Event
Capital and Other Regulatory Requirements [Line Items]
Cash reserve withdrawal	$ (3.8)

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Capital and Other Regulatory Requirements [Line Items]

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Cash Reserve Withdrawal

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Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 210
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478482/942-210-50-1

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