v3.26.3
INVESTMENTS - Amortized Cost and Fair Value of the Investment in IHAM (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Schedule of Investments [Line Items]    
Amortized Cost $ 29,477.5 [1] $ 29,249.9 [2]
Fair Value 29,212.6 [1] 29,484.8 [2]
Ivy Hill Asset Management, L.P.    
Schedule of Investments [Line Items]    
Amortized Cost 2,886.0 2,231.0
Fair Value 3,066.0 2,434.0
Subordinated loan    
Schedule of Investments [Line Items]    
Amortized Cost 1,000.0 531.0
Fair Value 1,000.0 531.0
Commitment to fund 1,000.0 750.0
Equity    
Schedule of Investments [Line Items]    
Amortized Cost 1,886.0 1,700.0
Fair Value $ 2,066.0 $ 1,903.0
[1] As of September 30, 2026, the estimated net unrealized gain for federal tax purposes was approximately $0.1 billion based on a tax cost basis of approximately $29.3 billion. As of September 30, 2026, the estimated aggregate gross unrealized gain for federal income tax purposes was approximately $1.6 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was approximately $1.5 billion.     
[2] As of December 31, 2025, the estimated net unrealized gain for federal tax purposes was approximately $300 million based on a tax cost basis of $29.2 billion. As of December 31, 2025, the estimated aggregate gross unrealized gain for federal income tax purposes was approximately $1.3 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was approximately $1.0 billion.