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Fair Value - Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
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Level 1 [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total |  | [1] |  |
Level 2 [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total | 151.2 | [1] | 154.0 |
Level 3 [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total |  | [1] |  |
5.50% Unsecured Notes [Member] | Level 1 [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total |  |  |  |
5.50% Unsecured Notes [Member] | Level 2 [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total | 76.5 |  | 77.8 |
5.50% Unsecured Notes [Member] | Level 3 [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total |  |  |  |
7.75% Unsecured Notes [Member] | Level 1 [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total |  |  |  |
7.75% Unsecured Notes [Member] | Level 2 [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total | 74.8 |  | 76.2 |
7.75% Unsecured Notes [Member] | Level 3 [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total |  |  |  |
Carrying Value [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total | 151.9 | [1],[2] | 151.6 | [3]
Carrying Value [Member] | 5.50% Unsecured Notes [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total | 79.6 | [2] | 79.5 | [3]
Carrying Value [Member] | 7.75% Unsecured Notes [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total | 72.3 | [2] | 72.1 | [3]
Fair Value [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total | 151.2 | [1],[4] | 154.0 | [5]
Fair Value [Member] | 5.50% Unsecured Notes [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total | 76.5 | [4] | 77.8 | [5]
Fair Value [Member] | 7.75% Unsecured Notes [Member] |  |  |  |
Schedule of Carrying Value and Fair Value of the Company’s Financial Liabilities Disclosed, but Not Carried, at Fair Value [Line Items] |  |  |  |
Total | $ 74.8 | [4] | $ 76.2 | [5]
[1] | Totals may not sum due to rounding.
[2] | Carrying value is net of unamortized deferred debt issuance costs. Unamortized deferred debt issuance costs associated with the 5.50% Unsecured Notes totaled approximately $0.9 million as of March 31, 2026. Unamortized deferred debt issuance costs associated with the 7.75% Unsecured Notes totaled approximately $2.5 million as of March 31, 2026.
[3] | Carrying value is net of unamortized deferred debt issuance costs. Unamortized deferred debt issuance costs associated with the 5.50% Unsecured Notes totaled approximately $1.0 million as of December 31, 2025. Unamortized deferred debt issuance costs associated with the 7.75% Unsecured Notes totaled approximately $2.6 million as of December 31, 2025.
[4] | For the 5.50% Unsecured Notes and the 7.75% Unsecured Notes, fair value is based upon the closing price on the last day of the period. The 5.50% Unsecured Notes and the 7.75% Unsecured Notes are listed on the NASDAQ Global Select Market (trading symbol “OXSQG”, and “OXSQH”, respectively).
[5] | For the 5.50% Unsecured Notes and 7.75% Unsecured Notes, fair value is based upon the closing price on the last day of the period. The 5.50% Unsecured Notes and 7.75% Unsecured Notes are listed on the NASDAQ Global Select Market (trading symbol “OXSQG” and “OXSQH”, respectively).

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