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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Assets    
Subtotal $ 8,020.4  
Investments measured at net asset value   $ 7,962.9
Liabilities    
Loans payable of Consolidated Funds 6,345.3 6,298.6
Total 6,345.3 6,298.6
Senior And Subordinated Notes    
Liabilities    
Loans payable of Consolidated Funds   10.0
Revolving Credit Facility    
Liabilities    
Loans payable of Consolidated Funds 186.1 177.9
Equity securities | Consolidated VIEs    
Assets    
Investments measured at net asset value 371.9 322.0
Investments In CLOs and other    
Assets    
Investments 581.2  
Fair Value, Inputs, Level 1, 2 and 3    
Assets    
Subtotal 7,493.4 7,460.9
Fair Value, Inputs, Level 1, 2 and 3 | Investments of Consolidated Funds    
Assets    
Investments 6,910.5 6,762.2
Fair Value, Inputs, Level 1, 2 and 3 | Equity securities    
Assets    
Investments 486.9 377.6
Fair Value, Inputs, Level 1, 2 and 3 | Bonds    
Assets    
Investments 503.1 522.5
Fair Value, Inputs, Level 1, 2 and 3 | Loans    
Assets    
Investments 5,920.5 5,862.1
Fair Value, Inputs, Level 1, 2 and 3 | Investments in CLOs    
Assets    
Investments 464.5 532.6
Fair Value, Inputs, Level 1, 2 and 3 | Other investments    
Assets    
Investments 116.7 166.1
Fair Value, Inputs, Level 1, 2 and 3 | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 1.7  
Level I    
Assets    
Subtotal 41.8 38.7
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 | Investments In CLOs and other    
Assets    
Investments 41.8  
Level I | Investments in CLOs    
Assets    
Investments 0.0 0.0
Level I | Other investments    
Assets    
Investments 41.8 38.7
Level I | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 0.0  
Level II    
Assets    
Subtotal 23.2 42.8
Liabilities    
Loans payable of Consolidated Funds 0.0 0.0
Total 0.0 0.0
Level II | Investments of Consolidated Funds    
Assets    
Investments 0.0 0.0
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 | 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 21.5 42.8
Level II | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 1.7  
Level III    
Assets    
Subtotal 7,428.4 7,379.4
Liabilities    
Loans payable of Consolidated Funds 6,345.3 6,298.6
Total 6,345.3 6,298.6
Level III | Investments of Consolidated Funds    
Assets    
Investments 6,910.5 6,762.2
Subtotal 6,910.5 6,762.2
Level III | Equity securities    
Assets    
Investments 486.9 377.6
Subtotal 56.3  
Investments measured at net asset value 56.2 50.4
Level III | Bonds    
Assets    
Investments 503.1 522.5
Level III | Loans    
Assets    
Investments 5,920.5 5,862.1
Level III | Investments In CLOs and other    
Assets    
Investments 517.9  
Level III | Investments in CLOs    
Assets    
Investments 464.5 532.6
Level III | Other investments    
Assets    
Investments 53.4 84.6
Level III | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 0.0  
Fair Value Measured at NAV    
Assets    
Investments measured at net asset value 527.0 502.0
Fair Value Measured at NAV | Investments of Consolidated Funds    
Assets    
Investments $ 517.4 $ 490.9