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Acquisitions Martin Currie Acquisition - Fair Value Assumptions (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2014
Mar. 31, 2016
Mar. 31, 2015
Oct. 01, 2014
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Business Combination, Contingent Consideration, Liability $ 62,923   $ 84,585 $ 110,784  
Business Combination, Contingent Consideration, Liability, Noncurrent 49,570        
Martin Currie [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Business Combination, Contingent Consideration, Liability 20,181   41,222 $ 70,114 $ 75,211
Business Combination, Contingent Consideration, Liability, Noncurrent 20,181        
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (21,041)        
Fund management contracts [Member] | 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 [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, Low End of Range   0.00%      
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] | 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, Low End of Range   0.00%      
Fair Value Input, Projected Cash Flow Growth Rate, High End of Range   28.00%      
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, Low End of Range   0.00%      
Fair Value Input, Projected Cash Flow Growth Rate, High End of Range   30.00%      
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%      
Change in Input Assumptions [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 18,000   33,375    
Change in Input Assumptions [Member] | Martin Currie [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 18,000   28,361    
Other changes in Fair Value [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 3,662   (2,484)    
Other changes in Fair Value [Member] | Martin Currie [Member]          
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]          
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability $ 3,041   $ 531