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Acquisitions and Dispositions Clarion Partners Acquisition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Apr. 13, 2016
Business Acquisition [Line Items]            
Revenues     $ 3,140,322 $ 2,886,902 $ 2,660,844  
Clarion Partners [Member]            
Business Acquisition [Line Items]            
Assets Under Management           $ 41,500,000
Noncontrolling Interest, Ownership Percentage by Parent           82.00%
Payments to Acquire Businesses, Gross $ 631,476          
Business Combination, Consideration Transferred, Other 36,772          
Co-Investments 16,210          
EnTrust Capital [Member]            
Business Acquisition [Line Items]            
Business Acquisition, Transaction Costs   $ 7,046        
Revenues       115,327    
Clarion Management Team [Member]            
Business Acquisition [Line Items]            
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners           18.00%
Clarion Partners [Member]            
Business Acquisition [Line Items]            
Business Acquisition, Transaction Costs       10,757 $ 2,807  
Revenues       249,468    
Management Equity Plan [Member] | Clarion Partners [Member]            
Business Acquisition [Line Items]            
Deferred Compensation Arrangement with Individual, Allocated Share-based Compensation Expense $ 15,200     $ 15,200    
Fund management contracts | Clarion Partners [Member]            
Business Acquisition [Line Items]            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life         10 years