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Commitments and Contingencies Commitments and Contingencies related to Acquisitions (Details) - USD ($)
$ in Thousands
6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Dec. 29, 2017
Aug. 17, 2016
Mar. 31, 2016
Business Acquisition, Contingent Consideration [Line Items]                
Payment for Contingent Consideration Liability, Total $ 6,587   $ 4,869 $ 3,242        
RARE Infrastructure, Ltd [Member]                
Business Acquisition, Contingent Consideration [Line Items]                
Business Combination, Contingent Consideration, Liability     0 0 $ 17,444     $ 27,145
Martin Currie [Member]                
Business Acquisition, Contingent Consideration [Line Items]                
Business Combination, Contingent Consideration, Liability     0 0 12,018     41,222
PK Investments [Member]                
Business Acquisition, Contingent Consideration [Line Items]                
Payment for Contingent Consideration Liability, Total       3,242        
QS Investors [Domain]                
Business Acquisition, Contingent Consideration [Line Items]                
Business Combination, Contingent Consideration, Liability     0 3,707 4,841     13,749
Payment for Contingent Consideration Liability, Total     4,319 0 6,587      
Other changes in Fair Value [Member] | RARE Infrastructure, Ltd [Member]                
Business Acquisition, Contingent Consideration [Line Items]                
Contingent consideration fair value adjustments     0 (31) 299      
Other changes in Fair Value [Member] | Martin Currie [Member]                
Business Acquisition, Contingent Consideration [Line Items]                
Contingent consideration fair value adjustments     0 1,337 (4,204)      
Other changes in Fair Value [Member] | QS Investors [Domain]                
Business Acquisition, Contingent Consideration [Line Items]                
Contingent consideration fair value adjustments     41 166 179      
Change in Input Assumptions [Member] | RARE Infrastructure, Ltd [Member]                
Business Acquisition, Contingent Consideration [Line Items]                
Contingent consideration fair value adjustments     0 (17,413) (10,000)      
Change in Input Assumptions [Member] | Martin Currie [Member]                
Business Acquisition, Contingent Consideration [Line Items]                
Contingent consideration fair value adjustments     0 (13,355) (25,000)      
Change in Input Assumptions [Member] | QS Investors [Domain]                
Business Acquisition, Contingent Consideration [Line Items]                
Contingent consideration fair value adjustments     571 (1,300) (2,500)      
Contingent payment due on fourth anniversary of acquisition [Member] | QS Investors [Domain]                
Business Acquisition, Contingent Consideration [Line Items]                
Payment for Contingent Consideration Liability, Total   $ 4,319            
Contingent payment due on second anniversary of acquisition [Member] | QS Investors [Domain]                
Business Acquisition, Contingent Consideration [Line Items]                
Payment for Contingent Consideration Liability, Total   6,587            
Consolidated Legg Mason, Inc.                
Business Acquisition, Contingent Consideration [Line Items]                
Business Combination, Contingent Consideration, Liability     1,415 5,607 36,810     $ 84,585
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contingent Liability           $ 1,900 $ 2,000  
Contingent consideration fair value adjustments     571 (31,329) (39,500)      
Business Combination, Contingent Consideration, Liability, Current       3,707        
Business Combination, Contingent Consideration, Liability, Noncurrent   $ 1,415   1,900        
Consolidated Legg Mason, Inc. | Other changes in Fair Value [Member]                
Business Acquisition, Contingent Consideration [Line Items]                
Contingent consideration fair value adjustments     106 1,468 (3,688)      
Consolidated Legg Mason, Inc. | Change in Input Assumptions [Member]                
Business Acquisition, Contingent Consideration [Line Items]                
Contingent consideration fair value adjustments     $ 571 $ (31,329) $ (39,500)