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Acquisitions Purchase Price Allocations Summary (Details)
£ in Thousands, AUD in Thousands, $ in Thousands
3 Months Ended
Jun. 30, 2016
USD ($)
Dec. 31, 2015
AUD
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
GBP (£)
Dec. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2013
USD ($)
May 02, 2016
USD ($)
Apr. 13, 2016
USD ($)
Mar. 31, 2016
USD ($)
Oct. 21, 2015
USD ($)
Mar. 31, 2015
USD ($)
Oct. 01, 2014
USD ($)
May 30, 2014
USD ($)
Business Acquisition [Line Items]                              
Business Combination, Contingent Consideration, Liability $ 62,923                   $ 84,585   $ 110,784    
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value 508,500                            
RARE Infrastructure, Ltd [Member]                              
Business Acquisition [Line Items]                              
Payments to Acquire Businesses, Gross   AUD 296,000 $ 213,739 [1]                        
Business Combination, Contingent Consideration, Liability 26,465                   27,145 $ 25,000 [1] 0    
Business Combination, Consideration Transferred [1]     $ 238,739                        
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value [1]                       62,722      
Business Combination, Total Entity Value [1]                       301,461      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents [1]                       9,667      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities [1]                       0      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables [1]                       6,612      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles [1]                       67,877      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment [1]                       673      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other [1]                       (10,605)      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other [1]                       (3,948)      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [1]                       0      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent [1]                       (58,619)      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [1]                       139,178      
Goodwill [1]                       162,283      
Martin Currie [Member]                              
Business Acquisition [Line Items]                              
Payments to Acquire Businesses, Gross         £ 125,000 $ 202,577                  
Business Combination, Contingent Consideration, Liability 20,181                   41,222   70,114 $ 75,211  
Business Combination, Consideration Transferred           $ 277,788                  
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value                           0  
Business Combination, Total Entity Value                           277,788  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents                           29,389  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities                           0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables                           0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles                           15,234  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment                           784  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other                           0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other                           (4,388)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                           (32,433)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent                           (31,537)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net                           119,500  
Goodwill                           158,288  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 21,041                            
QS Investors [Domain]                              
Business Acquisition [Line Items]                              
Payments to Acquire Businesses, Gross             $ 11,000                
Business Combination, Contingent Consideration, Liability 13,800                   13,749   13,553   $ 13,370
Business Combination, Consideration Transferred             $ 24,370                
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value                             0
Business Combination, Total Entity Value                             24,370
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents                             441
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities                             3,281
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables                             2,699
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles                             7,060
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment                             599
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other                             0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other                             (6,620)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                             0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent                             0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net                             7,460
Goodwill                             16,910
Fauchier [Member]                              
Business Acquisition [Line Items]                              
Payments to Acquire Businesses, Gross               $ 63,433              
Business Combination, Contingent Consideration, Liability 0                   0   $ 27,117    
EnTrust Capital [Member]                              
Business Acquisition [Line Items]                              
Payments to Acquire Businesses, Gross [1] 400,000                            
Business Combination, Contingent Consideration, Liability [1]                 $ 0            
Business Combination, Consideration Transferred [1] 540,000                            
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value [1]                 247,700            
Business Combination, Total Entity Value [1]                 787,700            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents [1]                 8,236            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities [1]                 16,220            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables [1]                 20,820            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles [1]                 35,500            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment [1]                 4,479            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other [1]                 1,030            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets [1]                 81            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [1]                 0            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent [1]                 0            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [1]                 546,566            
Goodwill [1]                 241,134            
Clarion Partners [Member]                              
Business Acquisition [Line Items]                              
Payments to Acquire Businesses, Gross [1] 631,476                            
Business Combination, Contingent Consideration, Liability [1]                   $ 0          
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures 11,121                            
Business Combination, Consideration Transferred [1] 642,597                            
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value [1]                   105,300          
Business Combination, Total Entity Value [1]                   747,897          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents [1]                   25,307          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities [1]                   22,285          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables [1]                   53,657          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles [1]                   102,800          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment [1]                   8,255          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other [1]                   (25,585)          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other [1]                   (10,580)          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [1]                   0          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent [1]                   (50,832)          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [1]                   653,607          
Goodwill [1]                   94,290          
Permal [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value [1]                 140,000            
Trade Names | RARE Infrastructure, Ltd [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets [1]                       4,766      
Trade Names | Martin Currie [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets                           7,130  
Trade Names | QS Investors [Domain]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets                             0
Trade Names | EnTrust Capital [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets [1]                 7,400            
Trade Names | Clarion Partners [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets [1]                   23,100          
Other Fund Management Contracts [Member] | RARE Infrastructure, Ltd [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets [1]                       $ 122,755      
Other Fund Management Contracts [Member] | Martin Currie [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets                           $ 135,321  
Other Fund Management Contracts [Member] | QS Investors [Domain]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets                             $ 0
Other Fund Management Contracts [Member] | EnTrust Capital [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets [1]                 452,800            
Other Fund Management Contracts [Member] | Clarion Partners [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets [1]                   $ 505,200          
EnTrustPermal [Member]                              
Business Acquisition [Line Items]                              
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value                 $ 403,200            
Consolidated Legg Mason, Inc.                              
Business Acquisition [Line Items]                              
Goodwill 1,795,409                   $ 1,479,516        
Consolidated Legg Mason, Inc. | Retained Earnings [Member] | EnTrust Capital [Member]                              
Business Acquisition [Line Items]                              
Reclassification from Retained Earnings to Noncontrolling Interests (15,500)     $ 0                      
Consolidated Legg Mason, Inc. | Additional Paid-in Capital                              
Business Acquisition [Line Items]                              
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures 25,860     18,555                      
Consolidated Legg Mason, Inc. | Additional Paid-in Capital | Clarion Partners [Member]                              
Business Acquisition [Line Items]                              
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures $ 11,121     $ 0                      
[1] (1)Post combination EnTrustPermal noncontrolling interest of $403,200 also includes a fair value reclassification of $15,500 from retained earnings