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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Net Investment Income [Line Items]          
Period of time for which management fees will be received by partners from the initial closing date     10 years    
Subsequent period in which management fees are recognized after these fees are called     6 months    
Percentage of management fees for CLOs on the total par amount of assets in the fund     1.00%    
Percentage of monthly management fee     1.25%    
Transaction and portfolio advisory fee, rebate offset percentage 100.00%   100.00%    
Transaction and advisory fees $ 26.2 $ 16.5 $ 50.0 $ 29.9  
Incentive Fees          
Performance fees allocation percentage to partnership (percent)     20.00%    
Accrued giveback obligations 43.9   $ 43.9   $ 44.0
Interest Income          
Interest income from investments $ 149.3 $ 122.1 $ 291.9 $ 231.9  
Minimum          
Net Investment Income [Line Items]          
Percentage of management fees earned     1.00%    
Percentage of management fees earned from invested capital     1.00%    
Extension period for fund closing     1 year    
Percentage of management fees for CLOs on the total par amount of assets in the fund     0.40%    
Period of management fees related to collateralized loan obligation     5 years    
Percentage of management fees for business development companies     1.00%    
Percentage of management fees from funds of funds during the commitment fee period     0.25%    
Percentage of management fees from funds of funds following the expiration of the weighted average investment period     0.25%    
Incentive Fees          
Percentage of allocation based performance fees related to fund of funds vehicles (percent)     2.00%    
Percent of preferred returns (percent)     7.00%    
Maximum          
Net Investment Income [Line Items]          
Percentage of management fees earned     2.00%    
Percentage of management fees earned from invested capital     2.00%    
Extension period for fund closing     2 years    
Percentage of management fees for CLOs on the total par amount of assets in the fund     0.50%    
Period of management fees related to collateralized loan obligation     10 years    
Percentage of management fees for business development companies     1.50%    
Percentage of management fees from funds of funds during the commitment fee period     1.50%    
Percentage of management fees from funds of funds following the expiration of the weighted average investment period     1.50%    
Incentive Fees          
Percentage of allocation based performance fees related to fund of funds vehicles (percent)     12.50%    
Percent of preferred returns (percent)     9.00%