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Current Expected Credit Losses (CECL) - Schedule of Current Expected Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance $ 2.4 $ 2.6
Current-period provision for expected credit losses 6.8 0.2
Ending balance 9.2 2.8
Accrued commissions and other receivables, net    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 0.7 1.0
Current-period provision for expected credit losses 0.9 0.0
Ending balance 1.6 1.0
Loans, forgivable loans and other receivables from employees and partners, net    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 1.7 1.6
Current-period provision for expected credit losses 0.4 0.2
Ending balance 2.1 1.8
Receivables from broker-dealers, clearing organizations, customers and related broker-dealers    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Beginning balance 0.0 0.0
Current-period provision for expected credit losses 5.5 0.0
Ending balance $ 5.5 $ 0.0