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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 |

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