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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Assets    
Subtotal $ 8,167.5  
Investments measured at net asset value   $ 7,962.9
Liabilities    
Loans payable of Consolidated Funds 6,352.3 6,298.6
Foreign currency forward contracts 0.7  
Total 6,353.0 6,298.6
Senior And Subordinated Notes    
Liabilities    
Loans payable of Consolidated Funds   10.0
Revolving Credit Facility    
Liabilities    
Loans payable of Consolidated Funds 182.8 177.9
Equity securities | Consolidated VIEs    
Assets    
Investments measured at net asset value 332.1 322.0
Investments In CLOs and other, and Partnership and LLC interests    
Assets    
Investments 695.4  
Fair Value, Inputs, Level 1, 2 and 3    
Assets    
Subtotal 7,650.4 7,460.9
Fair Value, Inputs, Level 1, 2 and 3 | Equity securities    
Assets    
Investments 387.3 377.6
Fair Value, Inputs, Level 1, 2 and 3 | Bonds    
Assets    
Investments 500.4 522.5
Fair Value, Inputs, Level 1, 2 and 3 | Loans    
Assets    
Investments 6,064.9 5,862.1
Fair Value, Inputs, Level 1, 2 and 3 | Investments of Consolidated Funds    
Assets    
Investments 6,952.6 6,762.2
Fair Value, Inputs, Level 1, 2 and 3 | Investments in CLOs    
Assets    
Investments 520.8 532.6
Fair Value, Inputs, Level 1, 2 and 3 | Other investments    
Assets    
Investments 174.6 166.1
Fair Value, Inputs, Level 1, 2 and 3 | Investments In CLOs and other, and Partnership and LLC interests    
Assets    
Investments   698.7
Fair Value, Inputs, Level 1, 2 and 3 | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 2.4  
Level I    
Assets    
Subtotal 38.3 38.7
Liabilities    
Loans payable of Consolidated Funds 0.0 0.0
Foreign currency forward contracts 0.0  
Total 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 of Consolidated Funds    
Assets    
Investments 0.0 0.0
Level I | Investments in CLOs    
Assets    
Investments 0.0 0.0
Level I | Other investments    
Assets    
Investments 38.3 38.7
Level I | Investments In CLOs and other, and Partnership and LLC interests    
Assets    
Investments 38.3 38.7
Level I | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 0.0  
Level II    
Assets    
Subtotal 45.5 42.8
Liabilities    
Loans payable of Consolidated Funds 0.0 0.0
Foreign currency forward contracts 0.7  
Total 0.7 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 of Consolidated Funds    
Assets    
Investments 0.0 0.0
Level II | Investments in CLOs    
Assets    
Investments 0.0 0.0
Level II | Other investments    
Assets    
Investments 43.1 42.8
Level II | Investments In CLOs and other, and Partnership and LLC interests    
Assets    
Investments 43.1 42.8
Level II | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 2.4  
Level III    
Assets    
Subtotal 7,566.6 7,379.4
Liabilities    
Loans payable of Consolidated Funds 6,352.3 6,298.6
Foreign currency forward contracts 0.0  
Total 6,352.3 6,298.6
Level III | Equity securities    
Assets    
Investments 387.3 377.6
Subtotal 7.8  
Investments measured at net asset value 50.3 50.4
Level III | Bonds    
Assets    
Investments 500.4 522.5
Level III | Loans    
Assets    
Investments 6,064.9 5,862.1
Level III | Investments of Consolidated Funds    
Assets    
Investments 6,952.6 6,762.2
Subtotal 6,952.6 6,762.2
Level III | Investments in CLOs    
Assets    
Investments 520.8 532.6
Level III | Other investments    
Assets    
Investments 93.2 84.6
Level III | Investments In CLOs and other, and Partnership and LLC interests    
Assets    
Investments 614.0 617.2
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 517.1 502.0
Fair Value Measured at NAV | Investments of Consolidated Funds    
Assets    
Investments $ 506.0 $ 490.9