Investment Portfolio Financing Arrangements - Schedule of Asset-Specific Financing Arrangements (Details) $ in Thousands	Sep. 30, 2026 USD ($) loan	Dec. 31, 2025 USD ($) loan
Debt Instrument [Line Items]
Outstanding principal balance	$ 4,198,054
Number of loans \| loan	59	50
Unamortized deferred financing costs	$ (17,500)	$ (15,000)
Asset-specific financing arrangements
Debt Instrument [Line Items]
Outstanding principal balance	31,125
Asset-specific financing arrangements \| Financing
Debt Instrument [Line Items]
Commitment amount	231,125	231,125
Outstanding principal balance	31,125	60,235
Carrying value	$ 30,743	$ 59,780
Wtd. avg. credit spread	1.90%	1.90%
Wtd. avg. term	3 years 10 months 24 days	3 years 3 months 18 days
Unamortized deferred financing costs	$ 400	$ 500
Asset-specific financing arrangements \| Financing \| HSBC Facility
Debt Instrument [Line Items]
Commitment amount	31,125	31,125
Outstanding principal balance	31,125	31,125
Carrying value	$ 30,743	$ 30,670
Wtd. avg. credit spread	1.90%	1.90%
Wtd. avg. term	3 years 10 months 24 days	4 years 8 months 12 days
Asset-specific financing arrangements \| Financing \| BMO Facility
Debt Instrument [Line Items]
Commitment amount	$ 200,000	$ 200,000
Outstanding principal balance	0	29,110
Carrying value	$ 0	$ 29,110
Wtd. avg. credit spread	0.00%	2.00%
Wtd. avg. term		1 year 8 months 12 days
Asset-specific financing arrangements \| Collateral
Debt Instrument [Line Items]
Outstanding principal balance	$ 41,500	$ 82,463
Wtd. avg. term	3 years 10 months 24 days	3 years 3 months 18 days
Amortized cost of collateral	$ 41,234	$ 82,095
Asset-specific financing arrangements \| Collateral \| HSBC Facility
Debt Instrument [Line Items]
Outstanding principal balance	$ 41,500	$ 41,500
Wtd. avg. term	3 years 10 months 24 days	4 years 8 months 12 days
Amortized cost of collateral	$ 41,234	$ 41,132
Asset-specific financing arrangements \| Collateral \| BMO Facility
Debt Instrument [Line Items]
Outstanding principal balance	0	$ 40,963
Wtd. avg. term		1 year 8 months 12 days
Amortized cost of collateral	$ 0	$ 40,963
Asset-specific financing arrangements \| Office Property Mortgage Loan \| HSBC Facility
Debt Instrument [Line Items]
Number of asset-specific financing arrangements \| loan	1	1
Number of loans \| loan	1	1
Asset-specific financing arrangements \| Office Property Mortgage Loan \| BMO Facility
Debt Instrument [Line Items]
Number of asset-specific financing arrangements \| loan	1	1
Number of loans \| loan	0	1