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Business Combinations - Summary of Final Purchase Price Allocation (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill   $ 774,534 $ 809,608
Hermes      
Business Acquisition [Line Items]      
Cash and Cash Equivalents $ 175,800    
Other Current Assets 53,700    
Goodwill 114,100    
Intangible Assets 320,000    
Other Long-Term Assets 40,100    
Less: Long-Term Deferred Tax Liability, net (28,700)    
Less: Liabilities Assumed (162,300)    
Less: Fair Value of Redeemable Noncontrolling Interest in Subsidiary (169,200)    
Total Purchase Price Consideration 343,500    
Receivables 31,900    
Property and Equipment, net 11,200    
Accrued Compensation and Benefits 130,300    
Hermes | Investment Advisory Contracts      
Business Acquisition [Line Items]      
Indefinite-lived intangible assets 198,500 $ 65,800  
Hermes | Trade Name      
Business Acquisition [Line Items]      
Indefinite-lived intangible assets 49,900    
Hermes | Customer Relationships      
Business Acquisition [Line Items]      
Customer relationships $ 71,600    
Weighted-average useful life 8 years 6 months