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Investments - International Senior Loan Program, LLC (Details) - USD ($)
$ in Millions
9 Months Ended
Feb. 09, 2021
Sep. 30, 2022
Aug. 31, 2022
May 31, 2022
Dec. 31, 2021
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Investments sold   $ 231.9      
International Senior Loan Program, LLC          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Ownership percentage 70.50%        
International Senior Loan Program, LLC | Pantheon          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Ownership percentage 29.50%        
International Senior Loan Program, LLC          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Debt capital contribution $ 317.1        
Distribution received 190.2        
Subordinated notes   173.3     $ 125.4
Equity interests   54.6     44.4
Commitments with equity and subordinated note interests   249.3     189.5
Capital contributions   229.6     165.7
Unfunded capital contributions   19.7     23.8
Debt securities   623.0     501.5
International Senior Loan Program, LLC | Line of Credit [Member]          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Maximum commitment amount   550.0      
Outstanding balance   $ 338.8     $ 272.1
Effective interest rate   2.90%     2.50%
International Senior Loan Program, LLC | Line of Credit [Member] | SOFR          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Spread rate (as a percent)   225.00%      
International Senior Loan Program, LLC | ISLP Credit Facility Tranche A          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Maximum commitment amount   $ 300.0      
International Senior Loan Program, LLC | ISLP Credit Facility Tranche B          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Maximum commitment amount     $ 200.0 $ 50.0  
International Senior Loan Program, LLC | Pantheon          
Investment Company, Nonconsolidated Subsidiary [Line Items]          
Debt capital contribution 138.3        
Equity Capital Contribution 46.1        
Joint venture investment $ 50.0        
Commitments with equity and subordinated note interests   103.9     $ 78.9
Capital contributions   91.1     69.8
Unfunded capital contributions   $ 12.8     $ 9.1