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Current Expected Credit Losses (CECL) - Schedule of Current Expected Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 27.2 $ 26.2
Current-period provision for expected credit losses 1.1 1.5
Ending balance 28.3 27.7
Accrued commissions and other receivables, net    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 6.2 5.0
Current-period provision for expected credit losses 0.0 0.9
Ending balance 6.2 5.9
Loans, forgivable loans and other receivables from employees and partners, net    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 0.0 2.3
Current-period provision for expected credit losses 0.0 0.0
Ending balance 0.0 2.3
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 21.0 18.9
Current-period provision for expected credit losses $ 1.1 0.6
Ending balance   $ 19.5