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Acquisitions RARE Acquisition - Fair Value Assumptions (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Fund management contracts [Member] | RARE Infrastructure, Ltd [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     12 years
Fair Value, Inputs, Level 3 [Member] | Fund management contracts [Member] | RARE Infrastructure, Ltd [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Fair Value Input, Projected Cash Flow Growth Rate, High End of Range   10.00%  
Fair Value Input, Projected Cash Flow Growth Rate, Average   7.00%  
Fair Value Inputs, Discount Rate   16.50%  
Fair Value, Inputs, Level 3 [Member] | Trade Names      
Business Acquisition, Contingent Consideration [Line Items]      
Fair Value Input, Projected Cash Flow Growth Rate, Average 8.00%    
Fair Value Inputs, Discount Rate 16.50%    
Fair Value, Inputs, Level 3 [Member] | Trade Names | RARE Infrastructure, Ltd [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Fair Value Input, Projected Cash Flow Growth Rate, High End of Range   10.00%  
Fair Value Input, Projected Cash Flow Growth Rate, Average   7.00%  
Fair Value Inputs, Discount Rate   16.50%  
Fair Value, Inputs, Level 3 [Member] | Asset Management Contracts      
Business Acquisition, Contingent Consideration [Line Items]      
Fair Value Inputs, Discount Rate 16.50%    
Fair Value Inputs, Long-term AUM Growth Rate 7.00%    
Fair Value Inputs, Attrition Rate (20.00%)    
Fair Value, Inputs, Level 3 [Member] | Asset Management Contracts | RARE Infrastructure, Ltd [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Fair Value Inputs, Discount Rate     16.50%
Fair Value Inputs, Long-term AUM Growth Rate     7.00%
Fair Value Inputs, Attrition Rate     (8.00%)
Performance Fees [Member] | Fair Value, Inputs, Level 3 [Member] | RARE Infrastructure, Ltd [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Fair Value Input, Projected Cash Flow Growth Rate, Average     3.00%
Earn-out Payments [Member] | Fair Value, Inputs, Level 3 [Member] | RARE Infrastructure, Ltd [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Fair Value Inputs, Discount Rate     1.90%
Assets Under Management [Member] | Fair Value, Inputs, Level 3 [Member] | RARE Infrastructure, Ltd [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Fair Value Input, Projected Cash Flow Growth Rate, Average     7.00%
Fair Value Inputs, Discount Rate     6.50%
Fair Value Assumptions, Weighted Average Volatility Rate     20.00%
Consolidated Legg Mason, Inc.      
Business Acquisition, Contingent Consideration [Line Items]      
Impairment of Intangible Assets $ 34,000 $ 0  
Trade Names      
Business Acquisition, Contingent Consideration [Line Items]      
Impairment of Intangible Assets 2,000    
Customer Contracts [Member] | RARE Infrastructure, Ltd [Member]      
Business Acquisition, Contingent Consideration [Line Items]      
Impairment of Intangible Assets $ 32,000