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v3.20.4

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 29, 2016 | Jan. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Jul. 29, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |
Adjustment Resulting from Broker Prices Received |  |  |  | $ 0.0 |  |
Lattice |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Contingent consideration | $ 60.0 |  |  |  |  |
Contingent consideration period | 4 years |  |  |  |  |
Payment for Contingent Consideration Liability, Operating Activities |  | $ 10.0 |  |  |  |
Business Combination, Contingent Consideration, Liability |  |  | $ 0.0 |  | $ 0.0 |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability |  |  | 11.9 |  |  |
Lattice | AUM Value [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input [Extensible List] |  |  | $ 2,300.0 |  |  | $ 3,000.0
Lattice | Contingent Consideration |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Discount rate |  |  |  | 10.00% |  |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Deposit Assets |  |  |  | $ 54.0 |  | $ 38.0

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