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Current Expected Credit Losses (CECL) - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Current-period provision for expected credit losses	$ 1.1	$ 1.5
Current expected credit losses reserve	28.3	27.7	$ 27.2	$ 26.2
Accrued commissions and other receivables, net
Financing Receivable, Allowance for Credit Loss [Line Items]
Current-period provision for expected credit losses	0.0	0.9
Current expected credit losses reserve	6.2	5.9	6.2	5.0
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers
Financing Receivable, Allowance for Credit Loss [Line Items]
Current-period provision for expected credit losses	1.1	0.6
Current expected credit losses reserve		$ 19.5	$ 21.0	$ 18.9
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers | Russia/Ukraine Conflit
Financing Receivable, Allowance for Credit Loss [Line Items]
Current expected credit losses reserve	$ 22.1

X

- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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