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Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Assets    
Subtotal $ 9,136.5  
Investments measured at net asset value   $ 7,962.9
Liabilities    
Loans payable of Consolidated Funds 7,623.4 6,298.6
Foreign currency forward contracts 0.5  
Total 7,623.9 6,298.6
Senior And Subordinated Notes    
Liabilities    
Loans payable of Consolidated Funds   10.0
Revolving Credit Facility    
Liabilities    
Loans payable of Consolidated Funds 177.7 177.9
Equity securities | Consolidated VIEs    
Assets    
Investments measured at net asset value 361.5 322.0
Investments In CLOs and other, and Partnership and LLC interests    
Assets    
Investments 687.9  
Fair Value, Inputs, Level 1, 2 and 3    
Assets    
Subtotal 8,631.5 7,460.9
Fair Value, Inputs, Level 1, 2 and 3 | Equity securities    
Assets    
Investments 420.0 377.6
Fair Value, Inputs, Level 1, 2 and 3 | Bonds    
Assets    
Investments 489.5 522.5
Fair Value, Inputs, Level 1, 2 and 3 | Loans    
Assets    
Investments 7,024.0 5,862.1
Fair Value, Inputs, Level 1, 2 and 3 | Investments of Consolidated Funds    
Assets    
Investments 7,933.5 6,762.2
Fair Value, Inputs, Level 1, 2 and 3 | Investments in CLOs    
Assets    
Investments 494.6 532.6
Fair Value, Inputs, Level 1, 2 and 3 | Other investments    
Assets    
Investments 193.3 166.1
Fair Value, Inputs, Level 1, 2 and 3 | Commercial paper and other    
Assets    
Subtotal 5.6  
Fair Value, Inputs, Level 1, 2 and 3 | Corporate treasury investments    
Assets    
Subtotal 5.6  
Fair Value, Inputs, Level 1, 2 and 3 | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 4.5  
Level I    
Assets    
Subtotal 41.6 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 41.6 38.7
Level I | Investments In CLOs and other, and Partnership and LLC interests    
Assets    
Investments 41.6  
Level I | Commercial paper and other    
Assets    
Subtotal 0.0  
Level I | Corporate treasury investments    
Assets    
Subtotal 0.0  
Level I | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 0.0  
Level II    
Assets    
Subtotal 53.2 42.8
Liabilities    
Loans payable of Consolidated Funds 0.0 0.0
Foreign currency forward contracts 0.5  
Total 0.5 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  
Level II | Commercial paper and other    
Assets    
Subtotal 5.6  
Level II | Corporate treasury investments    
Assets    
Subtotal 5.6  
Level II | Foreign currency forward contracts    
Assets    
Foreign currency forward contracts 4.5  
Level III    
Assets    
Subtotal 8,536.7 7,379.4
Liabilities    
Loans payable of Consolidated Funds 7,623.4 6,298.6
Foreign currency forward contracts 0.0  
Total 7,623.4 6,298.6
Level III | Equity securities    
Assets    
Investments 420.0 377.6
Subtotal 11.7  
Investments measured at net asset value 55.6 50.4
Level III | Bonds    
Assets    
Investments 489.5 522.5
Level III | Loans    
Assets    
Investments 7,024.0 5,862.1
Level III | Investments of Consolidated Funds    
Assets    
Investments 7,933.5 6,762.2
Subtotal 7,933.5 6,762.2
Level III | Investments in CLOs    
Assets    
Investments 494.6 532.6
Level III | Other investments    
Assets    
Investments 108.6 84.6
Level III | Investments In CLOs and other, and Partnership and LLC interests    
Assets    
Investments 603.2  
Level III | Commercial paper and other    
Assets    
Subtotal 0.0  
Level III | Corporate treasury investments    
Assets    
Subtotal 0.0  
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 505.0 502.0
Fair Value Measured at NAV | Investments of Consolidated Funds    
Assets    
Investments $ 494.9 $ 490.9