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Acquisitions - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2019
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Acquisitions            
Contingent consideration liability     $ 118,500,000   $ 118,500,000 $ 118,700,000
Goodwill     404,750,000   404,750,000 $ 404,750,000
Decrease in contingent consideration liability     $ 200,000 $ 14,000    
Percentage of projected annual growth rate for non managed money revenue     4.00%      
Percentage of market price risk     7.00%      
Percentage of revenue volatility     17.00%      
Discount rate     5.30%      
Minimum            
Acquisitions            
Estimated undiscounted earn out payments     $ 130,000,000      
Maximum            
Acquisitions            
Estimated undiscounted earn out payments     150,000,000      
USAA AMCO            
Acquisitions            
Percentage of outstanding common stock acquired 100.00%          
Working capital adjustment   $ 700,000        
Total consideration         949,400,000  
Payments to acquire business         851,300,000  
Contingent consideration liability $ 98,800,000   98,800,000   98,800,000  
Maximum aggregate contingent payment 150,000,000.0          
Maximum annual contingent payment $ 37,500,000          
Period of time over which contingent payments will be made 4 years          
Contingent consideration threshold percentage 80.00%          
Annual revenue percentage requirement to achieve the maximum contingent payment 100.00%          
Goodwill $ 120,643,000   120,600,000   $ 120,600,000  
Decrease in contingent consideration liability     $ (200,000)