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Fair Value Measurement - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets    
Subtotal $ 11,634.8  
Investments measured at net asset value   $ 8,316.4
Liabilities    
Loans payable of Consolidated Funds 8,208.7 6,809.1
Total 8,213.1 6,809.7
Revolving Credit Facility    
Liabilities    
Loans payable of Consolidated Funds 61.9 55.1
Senior Notes    
Liabilities    
Loans payable of Consolidated Funds 928.9  
Equity securities | Consolidated VIEs    
Assets    
Investments measured at net asset value 845.3 441.9
Foreign currency forward contracts    
Liabilities    
Foreign currency forward contracts 4.4 0.6
Fair Value, Inputs, Level 1, 2 and 3    
Assets    
Subtotal 10,293.1 7,995.7
Fair Value, Inputs, Level 1, 2 and 3 | Investments of Consolidated Funds    
Assets    
Investments 9,748.4 7,469.8
Fair Value, Inputs, Level 1, 2 and 3 | Equity securities    
Assets    
Investments 1,024.3 572.0
Fair Value, Inputs, Level 1, 2 and 3 | Bonds    
Assets    
Investments 634.6 465.1
Fair Value, Inputs, Level 1, 2 and 3 | Loans    
Assets    
Investments 8,089.5 6,431.4
Fair Value, Inputs, Level 1, 2 and 3 | Other    
Assets    
Investments   1.3
Fair Value, Inputs, Level 1, 2 and 3 | Investments In CLOs and other    
Assets    
Investments   525.9
Fair Value, Inputs, Level 1, 2 and 3 | Investments in CLOs    
Assets    
Investments 380.7 378.9
Fair Value, Inputs, Level 1, 2 and 3 | Other investments    
Assets    
Investments 158.1 147.0
Fair Value, Inputs, Level 1, 2 and 3 | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 5.9  
Level I    
Assets    
Subtotal 198.7 40.4
Liabilities    
Loans payable of Consolidated Funds 0.0 0.0
Total 0.0 0.0
Level I | Investments of Consolidated Funds    
Assets    
Investments 68.5 0.0
Level I | Equity securities    
Assets    
Investments 68.5 0.0
Level I | Bonds    
Assets    
Investments 0.0 0.0
Level I | Loans    
Assets    
Investments 0.0 0.0
Level I | Other    
Assets    
Investments   0.0
Level I | Investments In CLOs and other    
Assets    
Investments   40.4
Level I | Investments in CLOs    
Assets    
Investments 0.0 0.0
Level I | Other investments    
Assets    
Investments 130.2 40.4
Level I | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 0.0  
Liabilities    
Foreign currency forward contracts 0.0 0.0
Level II    
Assets    
Subtotal 39.4 22.8
Liabilities    
Loans payable of Consolidated Funds 0.0 0.0
Total 4.4 0.6
Level II | Investments of Consolidated Funds    
Assets    
Investments 12.3 1.3
Level II | Equity securities    
Assets    
Investments 12.3 0.0
Level II | Bonds    
Assets    
Investments 0.0 0.0
Level II | Loans    
Assets    
Investments 0.0 0.0
Level II | Other    
Assets    
Investments   1.3
Level II | Investments In CLOs and other    
Assets    
Investments   21.5
Level II | Investments in CLOs    
Assets    
Investments 0.0 0.0
Level II | Other investments    
Assets    
Investments 21.2 21.5
Level II | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 5.9  
Liabilities    
Foreign currency forward contracts 4.4 0.6
Level III    
Assets    
Subtotal 10,055.0 7,932.5
Liabilities    
Loans payable of Consolidated Funds 8,208.7 6,809.1
Total 8,208.7 6,809.1
Level III | Investments of Consolidated Funds    
Assets    
Investments 9,667.6 7,468.5
Subtotal 9,667.6 7,468.5
Level III | Equity securities    
Assets    
Investments 943.5 572.0
Subtotal 34.9  
Investments measured at net asset value 63.0 55.4
Level III | Bonds    
Assets    
Investments 634.6 465.1
Level III | Loans    
Assets    
Investments 8,089.5 6,431.4
Level III | Other    
Assets    
Investments   0.0
Level III | Investments In CLOs and other    
Assets    
Investments   464.0
Level III | Investments in CLOs    
Assets    
Investments 380.7 378.9
Level III | Other investments    
Assets    
Investments 6.7 85.1
Level III | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 0.0  
Liabilities    
Foreign currency forward contracts 0.0 0.0
Fair Value Measured at NAV    
Assets    
Investments measured at net asset value 1,341.7 320.7
Fair Value Measured at NAV | Investments of Consolidated Funds    
Assets    
Investments $ 1,300.0 $ 312.6