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Current Expected Credit Losses (CECL) - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]        
Current-period provision for expected credit losses $ 6.8 $ 0.2    
Current expected credit losses reserve 9.2 2.8 $ 2.4 $ 2.6
Accrued commissions and other receivables, net        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Current-period provision for expected credit losses 0.9 0.0    
Current expected credit losses reserve 1.6 1.0 0.7 1.0
Accrued commissions and other receivables, net | Russia's invasion of Ukraine        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Current-period provision for expected credit losses 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 0.4 0.2    
Current expected credit losses reserve 2.1 1.8 1.7 1.6
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 5.5 0.0    
Current expected credit losses reserve $ 5.5 $ 0.0 $ 0.0 $ 0.0