v3.26.1
Fair Value of Financial Instruments - Carrying Values and Estimated Fair Values of Debt Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt $ 11,160,596 $ 4,527,184
Principal Amount Outstanding 11,194,548 4,602,317
Line of Credit    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 11,160,596 4,527,184
Line of Credit | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 11,244,128 4,603,283
Revolving Credit Facility | Line of Credit    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 2,525,642 489,453
Principal Amount Outstanding 2,523,737 489,506
Revolving Credit Facility | Line of Credit | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 2,525,642 489,453
SG Funding Facility | Line of Credit    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 612,811 861,811
Principal Amount Outstanding 612,811 861,811
SG Funding Facility | Line of Credit | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 612,811 861,811
SB Funding Facility | Line of Credit    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 400,000 75,000
Principal Amount Outstanding 400,000 75,000
SB Funding Facility | Line of Credit | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 400,000 75,000
BNP Funding Facility | Line of Credit    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 900,000 250,000
Principal Amount Outstanding 900,000 250,000
BNP Funding Facility | Line of Credit | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 900,000 250,000
January 2037 CLO Notes    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Principal Amount Outstanding 694,100  
January 2037 CLO Notes | Line of Credit    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 473,310 473,120
Principal Amount Outstanding 476,000 476,000
January 2037 CLO Notes | Line of Credit | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 473,310 473,120
January 2037 CLO Notes | Unsecured Debt    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Principal Amount Outstanding 476,000  
April 2038 CLO Debt    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Principal Amount Outstanding 350,000  
April 2038 CLO Debt | Unsecured Debt    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 348,196 0
Principal Amount Outstanding 350,000 0
April 2038 CLO Debt | Unsecured Debt | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 348,196  
January 2039 CLO Debt | Unsecured Debt    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 529,820 0
Principal Amount Outstanding 532,000 0
January 2039 CLO Debt | Unsecured Debt | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 529,820  
March 2028 Notes | Unsecured Debt    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 1,004,008 984,492
Principal Amount Outstanding 1,000,000 1,000,000
March 2028 Notes | Unsecured Debt | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 1,013,110 1,000,510
September 2028 Notes | Unsecured Debt    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 597,103 0
Principal Amount Outstanding 600,000 0
September 2028 Notes | Unsecured Debt | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 604,992  
January 2029 Notes | Unsecured Debt    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 589,036 0
Principal Amount Outstanding 600,000 0
January 2029 Notes | Unsecured Debt | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 593,616  
August 2029 Notes | Unsecured Debt    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 705,261 687,445
Principal Amount Outstanding 700,000 700,000
August 2029 Notes | Unsecured Debt | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 717,759 712,824
February 2030 Notes | Unsecured Debt    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 731,239 705,863
Principal Amount Outstanding 750,000 750,000
February 2030 Notes | Unsecured Debt | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 757,665 740,565
September 2030 Notes | Unsecured Debt    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 496,117 0
Principal Amount Outstanding 500,000 0
September 2030 Notes | Unsecured Debt | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 505,680  
January 2031 Notes | Unsecured Debt    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 483,459 0
Principal Amount Outstanding 500,000 0
January 2031 Notes | Unsecured Debt | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value 491,060  
March 2032 Notes | Unsecured Debt    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Debt 764,594 0
Principal Amount Outstanding 750,000 $ 0
March 2032 Notes | Unsecured Debt | Fair Value    
FINANCIAL HIGHLIGHTS AND SENIOR SECURITIES    
Long-term debt, fair value $ 770,467