v3.26.1
INVESTMENTS - Yields at Amortized Cost and Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Schedule of Investments [Line Items]    
Amortized Cost $ 29,674.6 [1] $ 29,249.9 [2]
Fair Value $ 29,349.3 [1] $ 29,484.8 [2]
Subordinated loan    
Schedule of Investments [Line Items]    
Yield on investment, at cost 10.20% 10.30%
Yield on investment, at fair value 10.20% 10.30%
Amortized Cost $ 946.0 $ 531.0
Fair Value $ 946.0 $ 531.0
Equity    
Schedule of Investments [Line Items]    
Yield on investment, at cost 17.90% 17.20%
Yield on investment, at fair value 16.00% 15.30%
Amortized Cost $ 1,700.0 $ 1,700.0
Fair Value $ 1,897.0 $ 1,903.0
Subordinated certificates of the SDLP    
Schedule of Investments [Line Items]    
Yield on investment, at cost 13.20% 13.20%
Yield on investment, at fair value 13.00% 13.00%
Amortized Cost $ 1,140.0 $ 1,103.0
Fair Value $ 1,154.0 $ 1,117.0
[1] As of June 30, 2026, the estimated net unrealized loss for federal tax purposes was approximately $0.2 billion based on a tax cost basis of approximately $29.5 billion. As of June 30, 2026, the estimated aggregate gross unrealized loss for federal income tax purposes was approximately $1.5 billion and the estimated aggregate gross unrealized gain for federal income tax purposes was approximately $1.3 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.