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Current Expected Credit Losses (CECL) - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Financing Receivable Allowance For Credit Losses [Line Items]      
Current expected credit losses reserve $ 3.3 $ 3.3 $ 1.9
Increase (decrease) in expected credit losses reserve 0.6 1.4  
Accrued Commissions and Other Receivables, Net [Member]      
Financing Receivable Allowance For Credit Losses [Line Items]      
Current expected credit losses reserve 0.8 0.8 0.8
Increase (decrease) in expected credit losses reserve (0.2) 0.8  
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 2.5 2.5 $ 1.1
Increase (decrease) in expected credit losses reserve $ 0.8 $ 1.4