v3.26.1
Fair Value Measurements - Summary of Changes in Fair Value of Financial Instruments for which Level 3 Inputs were used to Determine Fair Value (Details) - Level 3 - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, beginning of period $ 3,760,730 $ 1,358,933
Purchase of investments (including PIK) 2,527,615 2,957,982
Proceeds from principal repayments and sales of investments (753,044) (526,935)
Amortization of premium/accretion of discount, net 15,573 9,395
Net realized gain (loss) on investments 13,707 7,323
Net change in unrealized appreciation (depreciation) on investments 25,868 5,954
Transfers out of Level 3   (99,351)
Transfers to Level 3 52,917 47,429
Fair value, end of period 5,643,366 3,760,730
Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated company investments 29,437 8,058
First Lien Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, beginning of period 3,654,487 1,200,165
Purchase of investments (including PIK) 2,517,982 2,925,154
Proceeds from principal repayments and sales of investments (668,742) (438,236)
Amortization of premium/accretion of discount, net 15,493 9,013
Net realized gain (loss) on investments 13,063 5,786
Net change in unrealized appreciation (depreciation) on investments 24,214 2,435
Transfers out of Level 3   (52,465)
Transfers to Level 3 52,917 2,635
Fair value, end of period 5,609,414 3,654,487
Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated company investments 27,327 3,789
Second Lien Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, beginning of period 42,019 130,876
Purchase of investments (including PIK) 338 337
Proceeds from principal repayments and sales of investments (24,250) (88,699)
Amortization of premium/accretion of discount, net 141 332
Net realized gain (loss) on investments 407 1,537
Net change in unrealized appreciation (depreciation) on investments (498) (272)
Transfers out of Level 3   (46,886)
Transfers to Level 3   44,794
Fair value, end of period 18,157 42,019
Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated company investments (24) 479
Subordinated Debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, beginning of period 990  
Purchase of investments (including PIK) 444 990
Amortization of premium/accretion of discount, net 3  
Net change in unrealized appreciation (depreciation) on investments 44  
Fair value, end of period 1,481 990
Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated company investments 44  
Equity and Other Investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, beginning of period 63,234 27,892
Purchase of investments (including PIK) 8,851 31,501
Proceeds from principal repayments and sales of investments (60,052)  
Amortization of premium/accretion of discount, net (64) 50
Net realized gain (loss) on investments 237  
Net change in unrealized appreciation (depreciation) on investments 2,108 3,791
Fair value, end of period 14,314 63,234
Net change in unrealized appreciation (depreciation) on non-controlled/non-affiliated company investments $ 2,090 $ 3,790