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Debt - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Mar. 09, 2026
Jan. 28, 2026
Sep. 09, 2025
Sep. 11, 2024
Mar. 11, 2024
Nov. 24, 2020
Feb. 10, 2020
Line Of Credit Facility [Line Items]                        
Debt, Current borrowing capacity $ 2,675,000   $ 2,675,000   $ 2,995,000              
Deferred financing costs 15,438   15,438   13,245              
Carrying value [1] 1,850,308   $ 1,850,308   1,874,620              
2025 Notes                        
Line Of Credit Facility [Line Items]                        
Aggregate principal amount                       $ 360,000
Interest rate                       3.75%
Debt Instrument, Maturity Date, Description     The 2025 Notes bore interest at a rate of 3.750% per year, payable semi-annually in arrears on February 10 and August 10 of each year. The 2025 Notes matured and were fully repaid on February 10, 2025, in accordance with their terms, using proceeds from the Revolving Credit Facility.                  
Carrying value 0   $ 0   0              
2026 Notes                        
Line Of Credit Facility [Line Items]                        
Aggregate principal amount         500,000           $ 500,000  
Interest rate                     2.875%  
Debt Instrument, Maturity Date, Description     The 2026 Notes bore interest at a rate of 2.875% per year, payable semi-annually in arrears on January 15 and July 15 of each year. The 2026 Notes matured and were fully repaid on January 15, 2026, in accordance with their terms, using proceeds from the Revolving Credit Facility.                  
Carrying value         499,921              
2027 Notes                        
Line Of Credit Facility [Line Items]                        
Aggregate principal amount 400,000   $ 400,000   400,000         $ 400,000    
Interest rate                 6.375% 6.375%    
Debt Instrument, Maturity Date, Description     The 2027 Notes bear interest at a rate of 6.375% per year, payable semi-annually in arrears on March 11 and September 11 of each year. The 2027 Notes will mature on March 11, 2027 and may be redeemed in whole or in part at the Company’s option at any time or from time to time at the redemption prices set forth in the indenture.                  
Carrying value 396,874   $ 396,874   397,333              
2029 Notes                        
Line Of Credit Facility [Line Items]                        
Aggregate principal amount 400,000   $ 400,000       $ 400,000          
Interest rate             5.10%          
Debt Instrument, Maturity Date, Description     The 2029 Notes bear interest at a rate of 5.100% per year, payable semi-annually in arrears on January 28 and July 28 of each year, commencing on July 28, 2026. The 2029 Notes will mature on January 28, 2029 and may be redeemed in whole or in part at the Company's option at any time or from time to time at the redemption prices set forth in the indenture.                  
Carrying value 388,565   $ 388,565                  
2030 Notes                        
Line Of Credit Facility [Line Items]                        
Aggregate principal amount 400,000   $ 400,000   400,000     $ 400,000        
Interest rate           5.65%   5.65%        
Debt Instrument, Maturity Date, Description     The 2030 Notes bear interest at a rate of 5.650% per year, payable semi-annually in arrears on March 9 and September 9 of each year. The 2030 Notes will mature on September 9, 2030 and may be redeemed in whole or in part at the Company’s option at any time or from time to time at the redemption prices set forth in the indenture.                  
Carrying value $ 385,228   $ 385,228   391,616              
Revolving Credit Facility                        
Line Of Credit Facility [Line Items]                        
Weighted average interest rate 5.41% 6.33% 5.48% 6.35%                
Average outstanding balance $ 668,364 $ 866,395 $ 703,863 $ 879,113                
Debt, Current borrowing capacity [2] 1,475,000 [1]   1,475,000 [1]   1,695,000              
Maximum borrowing capacity 2,542,500   $ 2,542,500                  
Revolving credit facility interest rate description     Borrowings denominated in USD, including amounts drawn in respect of letters of credit, bear interest (at the Company’s election) of either (i) Term SOFR plus a margin of either 1.775% or 1.65% (subject to certain gross borrowing base conditions) or (ii) an alternative base rate, which is the highest of (a) zero, (b) the highest of (i) the Prime Rate in effect on such day, (ii) the Federal Funds Effective Rate for such day plus 1/2 of 1.00% and (iii) the rate per annum equal to (x) the greater of (A) Term SOFR for an interest period of one (1) month and (B) zero plus (y) 1.00%, plus a margin of either 0.775% or 0.65% (subject to certain gross borrowing base conditions). Borrowings denominated in non-USD bear interest of the applicable term benchmark rate or the applicable risk-free rate (the “RFR rate”) plus a margin of either 1.775% or 1.65% (subject to the conditions applicable to borrowings denominated in USD that bear interest based on the applicable term benchmark rate or the applicable RFR rate). With respect to borrowings denominated in USD, the Company may elect either Term SOFR, or an alternative base rate at the time of borrowing, and such borrowings may be converted from one benchmark to another at any time, subject to certain conditions. Interest is payable in arrears on the applicable interest payment date as specified therein. The Company pays a fee of 0.325% per annum on committed but undrawn amounts under the Revolving Credit Facility, payable quarterly in arrears. Amounts borrowed under the Revolving Credit Facility will mature, and all accrued and unpaid interest will be due and payable, on May 5, 2031.                  
Line of credit facility, commitment fee percentage     0.325%                  
Cost incurred in obtaining revolving credit facility 41,912   $ 41,912                  
Unamortized deferred financing costs 15,438   15,438   13,245              
Carrying value [1],[2] $ 679,641   $ 679,641   $ 585,750              
Revolving Credit Facility | Minimum                        
Line Of Credit Facility [Line Items]                        
Asset coverage ratio 150.00%   150.00%                  
Asset coverage ratio with respect to consolidated assets 200.00%   200.00%                  
Revolving Credit Facility | Lenders Hold 84% of Total Lending Commitments                        
Line Of Credit Facility [Line Items]                        
Revolving credit facility accrued and unpaid interest due and payable date     May 05, 2031                  
Debt                        
Line Of Credit Facility [Line Items]                        
Asset coverage ratio requirement, description     Investment Company Act, is at least 150% after such borrowing (if certain requirements are met). As of June 30, 2026 and December 31, 2025, the Company’s asset coverage ratio based on the aggregate amount outstanding of senior securities was 172% and 175%.                  
Asset coverage ratio 172.00%   172.00%   175.00%              
Weighted average interest rate     5.77%   5.36%              
Average outstanding balance     $ 1,882,869   $ 1,860,251              
Maximum borrowing capacity $ 2,542,500   $ 2,542,500                  
[1] The carrying value is presented net of the unamortized debt issuance costs and includes the cumulative hedging adjustments for those borrowings that are designated in a fair value hedging relationship, as applicable.
[2] Provides, under certain circumstances, a total borrowing capacity of $2,542,500. The Company may borrow amounts in USD or certain other permitted currencies. Debt outstanding denominated in currencies other than USD has been converted to USD using the applicable foreign currency exchange rate as of the applicable reporting date. As of June 30, 2026, the Company had outstanding borrowings denominated in USD of $583,674, in EUR of EUR 13,700, in GBP of GBP 17,450, in CAD of CAD 57,020 and in AUD of AUD 24,500. As of December 31, 2025, the Company had outstanding borrowings denominated in USD of $489,674, in EUR of EUR 13,700, in GBP of GBP 18,950, in CAD of CAD 52,270 and in AUD of AUD 24,500.