v3.25.2
Investment Portfolio - Schedule of Investment Portfolio, at Fair Value and Percentage (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 13,647.8 [1] $ 13,490.4 [2]
Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 100.00% 100.00%
Automobiles & Components    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 4.0 $ 4.0
Automobiles & Components | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 0.00% 0.00%
Banks    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 0.0 $ 5.0
Banks | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 0.00% 0.00%
Capital Goods    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 1,658.0 $ 1,712.0
Capital Goods | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 12.10% 12.70%
Commercial & Professional Services    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 1,741.0 $ 1,733.0
Commercial & Professional Services | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 12.80% 12.80%
Consumer Discretionary Distribution & Retail    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 94.0 $ 174.0
Consumer Discretionary Distribution & Retail | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 0.70% 1.30%
Consumer Durables & Apparel    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 279.0 $ 229.0
Consumer Durables & Apparel | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 2.00% 1.70%
Consumer Services    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 323.0 $ 244.0
Consumer Services | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 2.40% 1.80%
Consumer Staples Distribution & Retail    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 98.0 $ 102.0
Consumer Staples Distribution & Retail | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 0.70% 0.80%
Credit Opportunities Partners JV, LLC    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 1,632.0 $ 1,363.0
Credit Opportunities Partners JV, LLC | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 12.00% 10.10%
Energy    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 33.0 $ 89.0
Energy | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 0.20% 0.70%
Equity Real Estate Investment Trusts (REITs)    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 266.0 $ 278.0
Equity Real Estate Investment Trusts (REITs) | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 1.90% 2.10%
Financial Services    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 936.0 $ 998.0
Financial Services | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 6.90% 7.40%
Food, Beverage & Tobacco    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 114.0 $ 113.0
Food, Beverage & Tobacco | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 0.80% 0.80%
Health Care Equipment & Services    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 1,611.0 $ 1,667.0
Health Care Equipment & Services | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 11.80% 12.40%
Household & Personal Products    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 119.0 $ 134.0
Household & Personal Products | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 0.90% 1.00%
Insurance    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 679.0 $ 735.0
Insurance | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 5.00% 5.40%
Materials    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 306.0 $ 334.0
Materials | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 2.20% 2.50%
Media & Entertainment    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 612.0 $ 699.0
Media & Entertainment | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 4.50% 5.20%
Pharmaceuticals, Biotechnology & Life Sciences    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 381.0 $ 298.0
Pharmaceuticals, Biotechnology & Life Sciences | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 2.80% 2.20%
Real Estate Management & Development    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 13.0 $ 27.0
Real Estate Management & Development | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 0.10% 0.20%
Software & Services    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 2,331.0 $ 2,187.0
Software & Services | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 17.10% 16.20%
Technology Hardware & Equipment    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 2.0 $ 2.0
Technology Hardware & Equipment | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 0.00% 0.00%
Telecommunication Services    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 65.0 $ 69.0
Telecommunication Services | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 0.50% 0.50%
Transportation    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Fair Value $ 351.0 $ 294.0
Transportation | Percentage  of Portfolio | Industry Concentration Risk    
Investment Company, Nonconsolidated Subsidiary [Line Items]    
Percentage of Portfolio 2.60% 2.20%
[1] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.
[2] See Note 8 for additional information regarding the fair value of the Company’s financial instruments.