v3.24.1.u1
Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Jan. 01, 2024
Sep. 30, 2023
Business Acquisition [Line Items]      
Goodwill $ 6,198.9   $ 6,003.8
Putnam Investments      
Business Acquisition [Line Items]      
Cash and cash equivalents   $ 101.1  
Receivables   118.9  
Investments, at fair value   111.2  
Property and equipment   87.1  
Goodwill   189.8  
Indefinite-lived intangible assets   542.5  
Definite-lived intangible asset   52.9  
Operating lease right-of-use assets   109.2  
Other assets   20.4  
Compensation and benefits   (57.8)  
Accounts payable and accrued expenses   (40.9)  
Operating lease liabilities   (109.2)  
Other liabilities   (12.1)  
Total Identifiable Net Assets   1,231.6  
Putnam Investments | Redeemable Noncontrolling Interests [Member]      
Business Acquisition [Line Items]      
Noncontrolling Interest, Fair Value   (20.2)  
Putnam Investments | Nonredeemable Noncontrolling Interest      
Business Acquisition [Line Items]      
Noncontrolling Interest, Fair Value   (25.8)  
Putnam Investments | CIPs [Member]      
Business Acquisition [Line Items]      
Cash and cash equivalents   281.4  
Investments, at fair value   849.5  
Accounts payable and accrued expenses   (259.6)  
Amount of debt assumed   $ (706.8)