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Current Expected Credit Losses (CECL) - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Jan. 01, 2020
Financing Receivable Allowance For Credit Losses [Line Items]    
Current expected credit losses reserve $ 2.6 $ 1.9
Increase (decrease) in expected credit losses reserve 0.7  
Loans, Forgivable Loans and Other Receivables from Employees and Partners, Net [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Current expected credit losses reserve 1.6 1.1
Increase (decrease) in expected credit losses reserve 0.5  
Accrued Commissions and Other Receivables, Net [Member]    
Financing Receivable Allowance For Credit Losses [Line Items]    
Current expected credit losses reserve 1.0 $ 0.8
Increase (decrease) in expected credit losses reserve $ 0.2