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Commitment and Contingencies - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
city
Sep. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Other Commitments [Line Items]        
Number of cities for leased offices | city   21    
Lease not yet commenced, future lease payments   $ 3.5    
Lease not yet commenced, term   9 years    
Occupancy expense $ 2.3   $ 4.6  
Unfunded capital commitments   $ 72.3   $ 60.5
Carried interest, contingent repayment obligations   156.0    
Legacy Funds        
Other Commitments [Line Items]        
Unfunded capital commitments   $ 39.2