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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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