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Fair Value - Schedule of Quantitative Information about Level 3 Fair Value Measurements (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 | Dec. 31, 2025
Senior Secured |  |  |  |  |
Total Fair Value for Level 3 Investments |  | $ 235.4 | [1] | $ 251.7 |
Senior Secured Notes [Member] |  |  |  |  |
Senior Secured |  |  |  |  |
Total Fair Value for Level 3 Investments |  | $ 150.8 |  | $ 147.3 |
Valuation Techniques/ Methodologies |  | Market quotes |  | Market quotes |
Unobservable Input | [2] | NBIB(3) |  | NBIB(3) |
Range/Weighted Average | [3] | 21.5% – 100.0%/78.6% |  | 18.2% – 100.6%/78.3% |
Impact to Fair Value from an Increase in Input | [4] |  |  |  |
CLO equity [Member] |  |  |  |  |
Senior Secured |  |  |  |  |
Total Fair Value for Level 3 Investments |  | $ 68.7 |  | $ 91.2 |
Valuation Techniques/ Methodologies |  | Market quotes |  | Market quotes |
Unobservable Input | [2] | NBIB(3) |  | NBIB(3) |
Range/Weighted Average | [3] | 0.0% – 57.0%/21.4% |  | 0.0% – 67.0%/27.4% |
Impact to Fair Value from an Increase in Input | [4] |  |  |  |
CLO equity [Member] |  |  |  |  |
Senior Secured |  |  |  |  |
Total Fair Value for Level 3 Investments |  | $ 1.9 |  |  |
Valuation Techniques/ Methodologies | [5] | Discounted cash flow(5) |  |  |
Unobservable Input | [6] | Discount rate(6) |  |  |
Range/Weighted Average | [3] | 20.3% – 27.0%/23.9% |  |  |
Impact to Fair Value from an Increase in Input | [4] |  |  |  |
CLO equity [Member] |  |  |  |  |
Senior Secured |  |  |  |  |
Total Fair Value for Level 3 Investments |  | $ 1.6 |  |  |
Valuation Techniques/ Methodologies | [7] | Liquidation Net Asset Value(9) |  |  |
Unobservable Input | [2] | NBIB(3) |  |  |
Range/Weighted Average | [3] | 0.0% – 22.5%/7.7% |  |  |
Impact to Fair Value from an Increase in Input | [4] |  |  |  |
Equity and Other Investments [Member] |  |  |  |  |
Senior Secured |  |  |  |  |
Total Fair Value for Level 3 Investments |  | $ 7.1 |  | $ 0.4 |
Valuation Techniques/ Methodologies |  | Recent transactions |  | Market quotes |
Unobservable Input |  | Actual trade/payoff(10) | [8] | NBIB(3) | [2]
Range/Weighted Average | [3] | 0.0% – 102.7%/92.3% |  | $3.75/ncm(4) | [9]
Impact to Fair Value from an Increase in Input | [4] |  |  |  |
Equity and Other Investments [Member] |  |  |  |  |
Senior Secured |  |  |  |  |
Total Fair Value for Level 3 Investments |  | $ 5.2 |  | $ 5.0 | [10]
Valuation Techniques/ Methodologies |  | Enterprise value(7) | [11] | Enterprise value(7) | [3]
Unobservable Input |  | Market multiples(8) |  | Market multiples(8) | [4]
Range/Weighted Average |  | 9.0x – 10.0x/9.5x |  | 8.8x – 9.8x/9.3x |
Impact to Fair Value from an Increase in Input |  | Increase |  | Increase |
Equity and Other Investments [Member] |  |  |  |  |
Senior Secured |  |  |  |  |
Total Fair Value for Level 3 Investments |  | $ 0.0 |  |  |
Valuation Techniques/ Methodologies |  | Market quotes |  |  |
Unobservable Input |  | NBIB(3) |  |  |
Range/Weighted Average | [3],[9] | $0.15/ncm(4) |  |  |
Impact to Fair Value from an Increase in Input | [4] |  |  |  |
CLO equity [Member] |  |  |  |  |
Senior Secured |  |  |  |  |
Total Fair Value for Level 3 Investments |  |  |  | $ 2.1 |
Valuation Techniques/ Methodologies | [5] |  |  | Discounted cash flow(5) |
Unobservable Input | [6] |  |  | Discount rate(6) |
Range/Weighted Average | [3] |  |  | 14.5% – 25.9%/22.3% |
Impact to Fair Value from an Increase in Input | [4] |  |  | Decrease |
CLO equity [Member] |  |  |  |  |
Senior Secured |  |  |  |  |
Total Fair Value for Level 3 Investments |  |  |  | $ 1.8 |
Valuation Techniques/ Methodologies | [7] |  |  | Liquidation Net Asset Value(9) |
Unobservable Input | [2] |  |  | NBIB(3) |
Range/Weighted Average | [3] |  |  | 0.0% – 33.0%/4.8% |
Impact to Fair Value from an Increase in Input | [4] |  |  |  |
Equity and Other Investments [Member] |  |  |  |  |
Senior Secured |  |  |  |  |
Total Fair Value for Level 3 Investments |  |  |  | $ 4.0 |
Valuation Techniques/ Methodologies |  |  |  | Recent Transactions |
Unobservable Input | [8] |  |  | Actual trade/payoff(10) |
Range/Weighted Average | [3],[9] |  |  | 100.0%/ncm(4) |
Impact to Fair Value from an Increase in Input | [4] |  |  |  |
[1] | Totals may not sum due to rounding.
[2] | The Company generally uses prices provided by an independent pricing service, or broker or agent bank non-binding indicative bid prices (“NBIB”), on or near the valuation date as the primary basis for the fair value determinations for syndicated notes, and CLO debt and equity investments, which may be adjusted for pending equity distributions as of valuation date. These bid prices are non-binding and may not be determinative of fair value. Each bid price is evaluated by the Valuation Committee in conjunction with additional information compiled by Oxford Square Management, including financial performance, recent business developments, and, in the case of CLO debt and equity investments, performance and covenant compliance information as provided by the independent trustee.
[3] | Weighted averages are calculated based on fair value of investments.
[4] | The impact on the fair value measurement of an increase in each unobservable input is in isolation. The discount rate is the rate used to discount future cash flows in a discounted cash flow calculation. An increase in the discount rate, in isolation, would result in a decrease in the fair value measurement. Market Multiples refer to the input (often derived from the value of a comparable company) that is multiplied by the historic and/or expected EBITDA of a company in order to estimate the company’s value. An increase in the Market Multiples, in isolation, would result in an increase in the fair value measurement.
[5] | The Company calculates the fair value of certain CLO equity investments based upon the net present value of expected contractual payment streams discounted using estimated market yields for the equity tranche of the respective CLO vehicle. The Company also considers those investments in which the record date for an equity distribution payment falls on or before the last day of the period, and the likelihood that a prospective purchaser would require an adjustment to the transaction price representing substantially all of the pending distribution.
[6] | Discount rate represents the rate at which future cash flows are discounted to calculate a present value, reflecting market assumptions for risk.
[7] | The fair value of those CLO equity positions which have been optionally redeemed are generally valued using a liquidation net asset value basis which represents the estimated expected residual value of the CLO as of the end of the period.
[8] | Prices provided by independent pricing services are evaluated in conjunction with actual trades and payoffs and, in certain cases, the value represented by actual trades or payoffs may be more representative of fair value as determined by the Valuation Committee.
[9] | The calculation of weighted average for a range of values, for a single investment within a given asset category, is not considered to provide a meaningful representation (“ncm”).
[10] | Market multiples represent an estimation of where market participants might value an enterprise based upon information available for comparable companies in the market.
[11] | Enterprise value is defined as the total value of a company, including debt and cash. For senior secured notes and equity investments, third-party valuation firms evaluate the financial and operational information of the portfolio companies that the Company provides to them, as well as independent market and industry information that they consider appropriate in forming an opinion as to the fair value of the Company’s securities. In those instances where the carrying value and/or internal credit rating of the investment does not require the use of a third-party valuation firm, a valuation is prepared by Oxford Square Management, which may include liquidation analysis or which may utilize a subsequent transaction to provide an indication of fair value.

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