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Acquisitions - Narrative (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jan. 01, 2024
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Business Acquisition [Line Items]          
Amortization of intangible assets   $ 84.6 $ 86.0 $ 170.4 $ 169.2
Revenue From Sponsored Funds   83.00% 83.00% 83.00% 83.00%
Putnam Investments          
Business Acquisition [Line Items]          
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares 31,600        
Cash consideration $ 221.7        
Deferred cash consideration 100.0        
Intangible assets, estimated useful lives   10 years   10 years  
Amortization of intangible assets       $ 1.3  
Contingent consideration liabilities $ 375.0        
Proforma Revenue       210.0  
Finite-Lived Intangible Asset, Expected Amortization Per Year   $ 5.3   5.3  
Putnam Investments | Great-West Lifeco Inc.          
Business Acquisition [Line Items]          
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Percent 6.00%        
Putnam Investments | Great-West Lifeco Inc. | five year          
Business Acquisition [Line Items]          
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Percent 4.90%        
Putnam Investments | 4.9% holding          
Business Acquisition [Line Items]          
Business Combination, Equity Consideration Transferred, Lock-up Period for 4.9% holding 5 years        
Putnam Investments | remaining shares          
Business Acquisition [Line Items]          
Business Combination, Equity Consideration Transferred, Lock-up Period for 4.9% holding 180 days        
Putnam Investments | General, administrative and other expense [Member]          
Business Acquisition [Line Items]          
Acquisition Related Costs       17.8  
Putnam Investments | Compensation and Benefits          
Business Acquisition [Line Items]          
Business Combination, Integration Related Costs       $ 103.0