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Current Expected Credit Losses (CECL) (Tables)
 3 Months Ended
Mar. 31, 2025
Credit Loss [Abstract]  
Schedule of Current Expected Credit Losses During the three months ended March 31, 2025 and 2024, the Company recorded changes in the allowance for credit losses as follows (in millions):
Accrued commissions and other receivables, netLoans, forgivable loans and other receivables
from employees and partners, net		Receivables from broker-dealers, clearing organizations,
customers and related broker-dealers		Total
Beginning balance, January 1, 2025$6.2 $— $21.0 $27.2 
Current-period provision for expected credit losses— — 1.1 1.1 
Ending balance, March 31, 2025$6.2 $— $22.1 $28.3 
Accrued commissions and other receivables, netLoans, forgivable loans and other receivables
from employees and partners, net		Receivables from broker-dealers, clearing organizations,
customers and related broker-dealers		Total
Beginning balance, January 1, 2024$5.0 $2.3 $18.9 $26.2 
Current-period provision for expected credit losses0.9 — 0.6 1.5 
Ending balance, March 31, 2024$5.9 $2.3 $19.5 $27.7