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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
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).