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Debt - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended
	Feb. 28, 2026 USD ($)	Mar. 31, 2026 USD ($) counterparty day loan	Feb. 19, 2026 USD ($) loan	Dec. 31, 2025 USD ($) counterparty	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jan. 27, 2022 USD ($)
Debt Instrument [Line Items]
Unpaid Principal Balance		$ 2,734,215		$ 2,679,909
Principal amount		2,604,339		2,476,490
Current expected credit loss reserve		85,316		87,401	$ 155,365	$ 165,932
Balance		2,604,339
Variable rate
Debt Instrument [Line Items]
Unpaid Principal Balance		2,647,772		2,595,234
Securitized loans | Variable rate
Debt Instrument [Line Items]
Unpaid Principal Balance		1,630,000		$ 1,172,999
Investment grade notes | BRSP 2026-FL3
Debt Instrument [Line Items]
Proceeds from sale of securitization trust	$ 955,000
Sale of notes	$ 833,200
Ramp-up acquisition period	6 months
Proceeds from sale of investments	$ 98,300
Reinvestment feature period	30 months
Balance		$ 955,000
Advance rate		87.30%
Number of loans (in loans) | loan		32
Investment grade notes | BRSP 2024-FL2
Debt Instrument [Line Items]
Proceeds from sale of securitization trust		$ 675,000
Sale of notes		583,900
Balance		$ 675,000
Advance rate		86.50%
Number of loans (in loans) | loan		27
Reinvestment period		2 years
Investment grade notes | BRSP 2021-FL 1
Debt Instrument [Line Items]
Balance			$ 440,800
Number of loans (in loans) | loan			17
Master repurchase facilities
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 2,400,000
Bank 1 | CLNC 2019-FL1
Debt Instrument [Line Items]
Number of counterparties holding collateral that exceeds amounts borrowed by more than 10% | counterparty		2		3
Bank 2 | CLNC 2019-FL1
Debt Instrument [Line Items]
Number of counterparties holding collateral that exceeds amounts borrowed by more than 10% | counterparty				3
Bank 3 | CLNC 2019-FL1
Debt Instrument [Line Items]
Number of counterparties holding collateral that exceeds amounts borrowed by more than 10% | counterparty				3
Bank 5 | CLNC 2019-FL1
Debt Instrument [Line Items]
Number of counterparties holding collateral that exceeds amounts borrowed by more than 10% | counterparty		2
Credit facilities
Debt Instrument [Line Items]
Principal amount		$ 772,327		$ 1,078,098
Balance		772,327
Credit facilities | Bank 1
Debt Instrument [Line Items]
Balance		204,600		216,400
Credit facilities | Bank 2
Debt Instrument [Line Items]
Balance				100,000
Credit facilities | Bank 3
Debt Instrument [Line Items]
Balance				122,000
Credit facilities | Bank 5
Debt Instrument [Line Items]
Balance		94,800
Credit facilities | Revolving credit facility | Credit agreement
Debt Instrument [Line Items]
Maximum borrowing capacity		120,000
Borrowing capacity, increase to maximum available principal amount							$ 180,000
Maximum amount that can be drawn		$ 120,000
Maximum amount of base value available for borrowing		50.00%
Tangible net worth		$ 900,000
Percentage of net cash proceeds from offering		0.70
Number of days to receive receipt | day		90
EBITDA plus lease expenses to fixed charges		1.40
Minimum interest coverage ratio		3.00
Maximum leverage ratio		0.80
Credit facilities | Revolving credit facility | Credit agreement | Option one
Debt Instrument [Line Items]
Interest rate margin (in percentage)		2.25%
Credit facilities | Revolving credit facility | Credit agreement | Option two
Debt Instrument [Line Items]
Margin on basis spread on variable rate		0.0125
Credit facilities | Revolving credit facility | Credit agreement | Option two | Federal funds rate
Debt Instrument [Line Items]
Interest rate margin (in percentage)		0.50%
Credit facilities | Revolving credit facility | Credit agreement | Option two | Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate margin (in percentage)		1.00%
Credit facilities | Master repurchase facilities
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 2,350,000
Principal amount		772,327		1,078,098
Credit facilities | Master repurchase facilities | Asset Pledged as Collateral
Debt Instrument [Line Items]
Current expected credit loss reserve		1,200,000		1,500,000
Credit facilities | Master repurchase facilities | Bank 1
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 600,000
Interest rate margin (in percentage)		2.42%
Principal amount		$ 341,594		433,642
Credit facilities | Master repurchase facilities | Bank 2
Debt Instrument [Line Items]
Maximum borrowing capacity		600,000
Principal amount		0		135,550
Credit facilities | Master repurchase facilities | Bank 3
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 500,000
Borrowing capacity, increase to maximum available principal amount				500,000
Interest rate margin (in percentage)		1.77%
Principal amount		$ 224,445		427,899
Credit facilities | Master repurchase facilities | Bank 5
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 250,000
Interest rate margin (in percentage)		2.25%
Principal amount		$ 120,642		0
Letters of Credit | Revolving credit facility | Credit agreement
Debt Instrument [Line Items]
Maximum borrowing capacity		25,000
Securitization Bonds Payable, Net
Debt Instrument [Line Items]
Principal amount		1,417,112		982,090
Balance		$ 1,417,112
Securitization Bonds Payable, Net | Asset Pledged as Collateral
Debt Instrument [Line Items]
Current expected credit loss reserve				1,200,000
Securitization Bonds Payable, Net | Investment grade notes | BRSP 2026-FL3
Debt Instrument [Line Items]
Interest rate margin (in percentage)		1.69%
Principal amount		$ 833,237		0
Securitization Bonds Payable, Net | Investment grade notes | BRSP 2024-FL2
Debt Instrument [Line Items]
Interest rate margin (in percentage)		2.47%
Principal amount		$ 583,875		583,875
Securitization Bonds Payable, Net | Investment grade notes | BRSP 2021-FL 1
Debt Instrument [Line Items]
Principal amount		$ 0		$ 398,215
Debt instrument, repurchase amount			$ 310,700
Minimum | Credit facilities
Debt Instrument [Line Items]
Initial debt term (in years)		1 year
Minimum | Credit facilities | Revolving credit facility | Credit agreement
Debt Instrument [Line Items]
Unused amount, commitment fee percentage		0.25%
Minimum | Credit facilities | Master repurchase facilities | Bank 2
Debt Instrument [Line Items]
Interest rate margin (in percentage)		1.35%
Minimum | Securitization Bonds Payable, Net | Investment grade notes | CLNC 2019-FL1
Debt Instrument [Line Items]
Initial debt term (in years)		2 years
Maximum | Credit facilities
Debt Instrument [Line Items]
Initial debt term (in years)		5 years
Maximum | Credit facilities | Revolving credit facility | Credit agreement
Debt Instrument [Line Items]
Unused amount, commitment fee percentage		0.35%
Maximum | Credit facilities | Master repurchase facilities | Bank 2
Debt Instrument [Line Items]
Interest rate margin (in percentage)		2.75%
Maximum | Securitization Bonds Payable, Net | Investment grade notes | CLNC 2019-FL1
Debt Instrument [Line Items]
Initial debt term (in years)		3 years

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