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Acquisitions Martin Currie Acquisition - Fair Value Assumptions (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2017
Martin Currie [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year       $ 0
Fund management contracts | Martin Currie [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     12 years  
Fund management contracts | Fair Value, Inputs, Level 3 [Member] | Martin Currie [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair Value Input, Projected Cash Flow Growth Rate, High End of Range     25.00%  
Fair Value Input, Projected Cash Flow Growth Rate, Average     11.00%  
Fair Value Inputs, Discount Rate     15.00%  
Asset Management Contracts | Fair Value, Inputs, Level 3 [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair Value Inputs, Discount Rate 16.50% 15.50%    
Fair Value Inputs, Long-term AUM Growth Rate 7.00% 7.00%    
Fair Value Inputs, Attrition Rate (20.00%) (13.00%)    
Asset Management Contracts | Fair Value, Inputs, Level 3 [Member] | Martin Currie [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair Value Inputs, Discount Rate     15.00%  
Fair Value Inputs, Long-term AUM Growth Rate     6.00%  
Fair Value Inputs, Attrition Rate     (17.00%)  
Assets Under Management [Member] | Fair Value, Inputs, Level 3 [Member] | Martin Currie [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair Value Input, Projected Cash Flow Growth Rate, Average     14.00%  
Fair Value Inputs, Discount Rate     13.00%  
Fair Value Assumptions, Weighted Average Volatility Rate     18.80%  
Performance Fees [Member] | Fair Value, Inputs, Level 3 [Member] | Martin Currie [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair Value Input, Projected Cash Flow Growth Rate, Average     15.00%  
Fair Value Inputs, Discount Rate     15.00%  
Earn-out Payments [Member] | Fair Value, Inputs, Level 3 [Member] | Martin Currie [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair Value Inputs, Discount Rate     1.30%