Debt - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Mar. 09, 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		$ 2,995,000	$ 2,955,000
Deferred financing costs		$ 13,245	11,897
2025 Notes
Line Of Credit Facility [Line Items]
Aggregate principal amount			360,000							$ 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. The 2025 Notes matured and were fully repaid on February 10, 2025, in accordance with their terms, using proceeds from the Revolving Credit Facility.
2026 Notes
Line Of Credit Facility [Line Items]
Aggregate principal amount		$ 500,000	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. The 2026 Notes matured on January 15, 2026. For further information, see Note 13 “Subsequent Events.”
2027 Notes
Line Of Credit Facility [Line Items]
Aggregate principal amount		$ 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. 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.
2030 Notes
Line Of Credit Facility [Line Items]
Aggregate principal amount		$ 400,000				$ 400,000
Interest rate						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, commencing on March 9, 2026. 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.
Revolving Credit Facility
Line Of Credit Facility [Line Items]
Weighted average interest rates		6.21%	7.21%	6.98%
Average outstanding balance		$ 795,868	$ 731,661	$ 1,070,027
Debt, Current borrowing capacity	[1]	1,695,000	1,695,000
Maximum borrowing capacity		$ 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 (x) 2.00%, (y) 1.875% (subject to maintenance of certain long-term corporate debt ratings) or (z) 1.75% (subject to certain gross borrowing base conditions), in each case, plus an additional 0.10% credit adjustment spread 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 (x) 1.00%, (y) 0.875% (subject to maintenance of certain long-term corporate debt ratings) or (z) 0.75% (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 2.00%, 1.875% or 1.75% (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), plus, (i) in the case of borrowings denominated in GBP only, an additional 0.1193% credit adjustment spread, (ii) in the case of borrowings denominated in CHF only, an additional 0.0031% and (iii) in the case of borrowings denominated in CAD only, an additional 0.29547% (one-month interest period) or an additional 0.32138% (three-month interest period) credit adjustment spread. Borrowings from certain lenders, which hold approximately 84% of total lending commitments (the "Extending Lenders"), bear interest at the applicable rates described above less 0.10%. 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 0.375% per annum on committed but undrawn amounts under the Revolving Credit Facility, payable quarterly in arrears. Any amounts borrowed under the Revolving Credit Facility with respect to the Extending Lenders, will mature, and all accrued and unpaid interest will be due and payable, on June 24, 2030. Any amounts borrowed under the Revolving Credit Facility, will mature, and all accrued and unpaid interest will be due and payable, with respect to certain remaining lenders, on May 5, 2027, and with respect to other remaining lenders, on October 18, 2028.
Line of credit facility, commitment fee percentage		0.375%
Cost incurred in obtaining revolving credit facility		$ 38,110
Unamortized deferred financing costs		$ 13,245	$ 11,897
Revolving Credit Facility | Borrowings denominated in USD
Line Of Credit Facility [Line Items]
Additional credit adjustment spread		0.10%
Revolving Credit Facility | Borrowings denominated in Pound Sterling (GBP)
Line Of Credit Facility [Line Items]
Additional credit adjustment spread		0.1193%
Revolving Credit Facility | Borrowings denominated in CHF
Line Of Credit Facility [Line Items]
Additional credit adjustment spread		0.0031%
Revolving Credit Facility | Minimum
Line Of Credit Facility [Line Items]
Asset coverage ratio		150.00%
Asset coverage ratio with respect to consolidated assets		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		Jun. 24, 2030
Revolving Credit Facility | Lenders Hold 84% of Total Lending Commitments | Borrowings denominated in USD
Line Of Credit Facility [Line Items]
Additional credit adjustment spread		0.10%
Revolving Credit Facility | Certain Remaining Lenders
Line Of Credit Facility [Line Items]
Revolving credit facility accrued and unpaid interest due and payable date		May 05, 2027
Revolving Credit Facility | Other Lenders
Line Of Credit Facility [Line Items]
Revolving credit facility accrued and unpaid interest due and payable date		Oct. 18, 2028
Revolving Credit Facility | One-month Canadian Dollars | Borrowings denominated in Canadian Dollars
Line Of Credit Facility [Line Items]
Additional credit adjustment spread		0.29547%
Revolving Credit Facility | Three-month Canadian Dollars | Borrowings denominated in Canadian Dollars
Line Of Credit Facility [Line Items]
Additional credit adjustment spread		0.32138%
Forecast | 2030 Notes
Line Of Credit Facility [Line Items]
Interest rate					5.65%
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 December 31, 2025 and December 31, 2024, the Company’s asset coverage ratio based on the aggregate amount outstanding of senior securities was 175% and 181%.
Asset coverage ratio		175.00%	181.00%
Weighted average interest rates		5.36%	5.28%
Average outstanding balance		$ 1,860,251	$ 1,915,158
Maximum borrowing capacity		$ 2,542,500

[1] 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 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. As of December 31, 2024, the Company had outstanding borrowings denominated in USD of $626,674, in EUR of EUR 10,500, in GBP of GBP 18,950, in CAD of CAD 8,520 and in AUD of AUD 12,000.