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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