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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Assets    
Subtotal $ 9,873.2  
Investments measured at net asset value   $ 8,316.4
Liabilities    
Loans payable of Consolidated Funds 7,680.3 6,809.1
Total 7,683.3 6,809.7
Revolving Credit Facility    
Liabilities    
Loans payable of Consolidated Funds 121.4 55.1
Equity securities | Consolidated VIEs    
Assets    
Investments measured at net asset value 684.8 441.9
Investments In CLOs and other    
Assets    
Investments 533.6  
Foreign currency forward contracts    
Liabilities    
Foreign currency forward contracts 3.0 0.6
Fair Value, Inputs, Level 1, 2 and 3    
Assets    
Subtotal 9,486.2 7,995.7
Fair Value, Inputs, Level 1, 2 and 3 | Investments of Consolidated Funds    
Assets    
Investments 8,950.1 7,469.8
Fair Value, Inputs, Level 1, 2 and 3 | Equity securities    
Assets    
Investments 821.7 572.0
Fair Value, Inputs, Level 1, 2 and 3 | Bonds    
Assets    
Investments 495.8 465.1
Fair Value, Inputs, Level 1, 2 and 3 | Loans    
Assets    
Investments 7,632.6 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 365.5 378.9
Fair Value, Inputs, Level 1, 2 and 3 | Other investments    
Assets    
Investments 168.1 147.0
Fair Value, Inputs, Level 1, 2 and 3 | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 2.5  
Level I    
Assets    
Subtotal 83.2 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 0.0 0.0
Level I | Equity securities    
Assets    
Investments 0.0 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 83.2 40.4
Level I | Investments in CLOs    
Assets    
Investments 0.0 0.0
Level I | Other investments    
Assets    
Investments 83.2 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 23.7 22.8
Liabilities    
Loans payable of Consolidated Funds 0.0 0.0
Total 3.0 0.6
Level II | Investments of Consolidated Funds    
Assets    
Investments 0.0 1.3
Level II | Equity securities    
Assets    
Investments 0.0 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 21.2 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 2.5  
Liabilities    
Foreign currency forward contracts 3.0 0.6
Level III    
Assets    
Subtotal 9,379.3 7,932.5
Liabilities    
Loans payable of Consolidated Funds 7,680.3 6,809.1
Total 7,680.3 6,809.1
Level III | Investments of Consolidated Funds    
Assets    
Investments 8,950.1 7,468.5
Subtotal 8,950.1 7,468.5
Level III | Equity securities    
Assets    
Investments 821.7 572.0
Subtotal 103.0  
Investments measured at net asset value 55.6 55.4
Level III | Bonds    
Assets    
Investments 495.8 465.1
Level III | Loans    
Assets    
Investments 7,632.6 6,431.4
Level III | Other    
Assets    
Investments   0.0
Level III | Investments In CLOs and other    
Assets    
Investments 429.2 464.0
Level III | Investments in CLOs    
Assets    
Investments 365.5 378.9
Level III | Other investments    
Assets    
Investments 63.7 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 387.0 320.7
Fair Value Measured at NAV | Investments of Consolidated Funds    
Assets    
Investments $ 379.2 $ 312.6