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Current Expected Credit Losses (CECL) - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]        
Current-period provision for expected credit losses $ 1.9 $ 6.8    
Current expected credit losses reserve 16.8 9.2 $ 14.9 $ 2.4
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 5.4 1.6 5.4 0.7
Accrued commissions and other receivables, net | Russia/Ukraine Conflit        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Current expected credit losses reserve   0.5    
Loans, forgivable loans and other receivables from employees and partners, net        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Current-period provision for expected credit losses (0.1) 0.4    
Current expected credit losses reserve 2.4 2.1 2.5 1.7
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 2.0 5.5    
Current expected credit losses reserve $ 9.0 $ 5.5 $ 7.0 $ 0.0