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INVESTMENTS - Fair Value Level 3 (Details)
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 4,479,835,000 $ 3,094,065,000
Senior debt and 1st lien notes    
Schedule of Equity Method Investments [Line Items]    
Fair Value 3,798,999,000 2,503,156,000
Subordinated debt and 2nd lien notes    
Schedule of Equity Method Investments [Line Items]    
Fair Value 187,919,000 122,748,000
Equity shares    
Schedule of Equity Method Investments [Line Items]    
Fair Value 366,880,000 337,684,000
Equity warrants    
Schedule of Equity Method Investments [Line Items]    
Fair Value 1,065,000 2,813,000
Royalty rights    
Schedule of Equity Method Investments [Line Items]    
Fair Value 3,953,000 14,583,000
Structured products    
Schedule of Equity Method Investments [Line Items]    
Fair Value 103,020,000 80,401,000
Level 3    
Schedule of Equity Method Investments [Line Items]    
Fair Value 4,021,527,000 2,888,065,000
Level 3 | Senior debt and 1st lien notes    
Schedule of Equity Method Investments [Line Items]    
Fair Value 3,478,502,000 2,402,177,000
Level 3 | Senior debt and 1st lien notes | Yield Analysis | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 2,731,495,000 $ 1,975,176,000
Level 3 | Senior debt and 1st lien notes | Yield Analysis | Minimum | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Input 0.066 0.065
Level 3 | Senior debt and 1st lien notes | Yield Analysis | Maximum | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Input 0.270 0.758
Level 3 | Senior debt and 1st lien notes | Yield Analysis | Weighted Average | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Input 0.097 0.104
Level 3 | Senior debt and 1st lien notes | Market Approach | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 63,919,000 $ 35,525,000
Level 3 | Senior debt and 1st lien notes | Market Approach | Minimum | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 0.2 0.5
Level 3 | Senior debt and 1st lien notes | Market Approach | Maximum | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 9.5 9.0
Level 3 | Senior debt and 1st lien notes | Market Approach | Weighted Average | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 7.1 8.2
Level 3 | Senior debt and 1st lien notes | Recent Transaction | Transaction Price    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 673,613,000 $ 391,476,000
Level 3 | Senior debt and 1st lien notes | Recent Transaction | Minimum | Transaction Price    
Schedule of Equity Method Investments [Line Items]    
Input 0.975 0.950
Level 3 | Senior debt and 1st lien notes | Recent Transaction | Maximum | Transaction Price    
Schedule of Equity Method Investments [Line Items]    
Input 1.000 1.000
Level 3 | Senior debt and 1st lien notes | Recent Transaction | Weighted Average | Transaction Price    
Schedule of Equity Method Investments [Line Items]    
Input 0.989 0.986
Level 3 | Senior debt and 1st lien notes | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 9,475,000 $ 15,937,000
Level 3 | Subordinated debt and 2nd lien notes    
Schedule of Equity Method Investments [Line Items]    
Fair Value 161,104,000 110,909,000
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 133,899,000 $ 78,884,000
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis | Minimum | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Input 0.070 0.080
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis | Maximum | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Input 0.215 0.186
Level 3 | Subordinated debt and 2nd lien notes | Yield Analysis | Weighted Average | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Input 0.135 0.131
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 25,205,000 $ 25,667,000
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Minimum | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 0.7 0.9
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Maximum | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 25.9 22.4
Level 3 | Subordinated debt and 2nd lien notes | Market Approach | Weighted Average | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 14.5 14.8
Level 3 | Subordinated debt and 2nd lien notes | Recent Transaction | Transaction Price    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 2,000,000 $ 702,000
Input 1.000 0.980
Level 3 | Subordinated debt and 2nd lien notes | Recent Transaction | Weighted Average | Transaction Price    
Schedule of Equity Method Investments [Line Items]    
Input 1.000 0.980
Level 3 | Subordinated debt and 2nd lien notes | Expected Recovery | Expected Recovery    
Schedule of Equity Method Investments [Line Items]    
Fair Value   $ 5,656,000
Input   5,656,100
Level 3 | Subordinated debt and 2nd lien notes | Expected Recovery | Weighted Average | Expected Recovery    
Schedule of Equity Method Investments [Line Items]    
Input   5,656,100
Level 3 | Equity shares    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 363,138,000 $ 337,684,000
Level 3 | Equity shares | Yield Analysis | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 38,758,000 $ 30,517,000
Level 3 | Equity shares | Yield Analysis | Minimum | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Input 0.117 0.108
Level 3 | Equity shares | Yield Analysis | Maximum | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Input 0.294 0.305
Level 3 | Equity shares | Yield Analysis | Weighted Average | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Input 0.152 0.141
Level 3 | Equity shares | Market Approach | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 291,493,000 $ 282,073,000
Level 3 | Equity shares | Market Approach | Revenue Multiple    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 882,000 $ 1,367,000
Level 3 | Equity shares | Market Approach | Minimum | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 0.2 0.5
Level 3 | Equity shares | Market Approach | Minimum | Revenue Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 5.5 5.5
Level 3 | Equity shares | Market Approach | Maximum | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 27.5 28.5
Level 3 | Equity shares | Market Approach | Maximum | Revenue Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 8.8 8.8
Level 3 | Equity shares | Market Approach | Weighted Average | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 11.4 11.1
Level 3 | Equity shares | Market Approach | Weighted Average | Revenue Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 5.7 5.8
Level 3 | Equity shares | Recent Transaction | Transaction Price    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 9,120,000 $ 8,843,000
Level 3 | Equity shares | Recent Transaction | Minimum | Transaction Price    
Schedule of Equity Method Investments [Line Items]    
Input 0.00 1.00
Level 3 | Equity shares | Recent Transaction | Maximum | Transaction Price    
Schedule of Equity Method Investments [Line Items]    
Input 100.00 1,847.58
Level 3 | Equity shares | Recent Transaction | Weighted Average | Transaction Price    
Schedule of Equity Method Investments [Line Items]    
Input 3.23 1,326.31
Level 3 | Equity shares | Discounted Cash Flow Analysis | Discount Rate    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 9,992,000 $ 8,426,000
Input 0.124 0.129
Level 3 | Equity shares | Discounted Cash Flow Analysis | Weighted Average | Discount Rate    
Schedule of Equity Method Investments [Line Items]    
Input 0.124 0.129
Level 3 | Equity shares | Net Asset Approach | Liabilities    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 12,893,000 $ 6,458,000
Input   96,678,300
Level 3 | Equity shares | Net Asset Approach | Minimum | Liabilities    
Schedule of Equity Method Investments [Line Items]    
Input 45,292,500  
Level 3 | Equity shares | Net Asset Approach | Maximum | Liabilities    
Schedule of Equity Method Investments [Line Items]    
Input 117,088,000  
Level 3 | Equity shares | Net Asset Approach | Weighted Average | Liabilities    
Schedule of Equity Method Investments [Line Items]    
Input 70,228,800 96,678,300
Level 3 | Equity warrants    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 1,065,000 $ 2,813,000
Level 3 | Equity warrants | Market Approach | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 1,065,000 $ 2,813,000
Level 3 | Equity warrants | Market Approach | Minimum | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 0.5 0.5
Level 3 | Equity warrants | Market Approach | Maximum | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 11.3 11.8
Level 3 | Equity warrants | Market Approach | Weighted Average | Adjusted EBITDA Multiple    
Schedule of Equity Method Investments [Line Items]    
Input 11.3 8.0
Level 3 | Royalty rights    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 3,953,000 $ 14,583,000
Level 3 | Royalty rights | Yield Analysis | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 3,953,000 $ 14,583,000
Level 3 | Royalty rights | Yield Analysis | Minimum | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Input 0.280 0.186
Level 3 | Royalty rights | Yield Analysis | Maximum | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Input 0.300 0.264
Level 3 | Royalty rights | Yield Analysis | Weighted Average | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Input 0.290 0.210
Level 3 | Structured products    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 13,765,000 $ 19,899,000
Level 3 | Structured products | Yield Analysis | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Fair Value   $ 3,962,000
Input   0.097
Level 3 | Structured products | Yield Analysis | Weighted Average | Market Yield    
Schedule of Equity Method Investments [Line Items]    
Input   0.097
Level 3 | Structured products | Valuation, Unadjusted Prices From Independent Pricing Services And Independent Indicative Broker Quotes    
Schedule of Equity Method Investments [Line Items]    
Fair Value $ 13,765,000