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Business Combinations - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Jul. 01, 2018
Jun. 01, 2017
Aug. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]            
Purchase price, cash       $ 129,500 $ 471,400  
Goodwill       $ 290,366   $ 170,153
Sustainable Growth Advisers, LP            
Business Acquisition [Line Items]            
Percentage of voting interests acquired 70.00%          
Purchase price $ 129,500          
Purchase price, cash 110,500   $ 19,000      
Goodwill 120,213          
Intangible assets 62,000          
Expected tax deductible amount of goodwill and other intangible assets $ 127,500          
RidgeWorth            
Business Acquisition [Line Items]            
Purchase price   $ 547,100        
Goodwill   163,365        
Intangible assets   275,700        
Assets under management   40,100,000        
Long term assets under management   35,700,000        
Liquidity strategy assets under management   4,400,000        
Consolidated entity excluding consolidated investment products | RidgeWorth            
Business Acquisition [Line Items]            
Purchase price   485,200        
CLOs | RidgeWorth            
Business Acquisition [Line Items]            
Purchase price   $ 61,900        
Sustainable Growth Advisers, LP | SGIA, LLC | Sustainable Growth Advisers, LP            
Business Acquisition [Line Items]            
Percentage of membership interests 100.00%