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Fair Value - Schedule of Reconciliation of the Fair Value of Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Schedule of Reconciliation of the Fair Value of Investments [Line Items]    
Balance $ 251.7 [1] $ 260.9 [2]
Net realized (losses)/gains included in earnings (30.7) [1] (16.8) [2]
Net unrealized appreciation/(depreciation) included in earnings 1.1 [1] (24.3) [2]
Accretion of discounts 1.0 [1] 2.9 [2]
Purchases 15.8 [1] 92.1 [2]
Repayments and sales (0.4) [1] (58.4) [2]
Transfers between asset classes [1]  
Reductions to CLO Equity cost value (3.9) [1],[3] (7.7) [2],[4]
PIK income 0.8 [1] 3.2 [2]
Transfers in and/or (out) of level 3 [1] [2]
Balance [1] 235.4 251.7
Net change in unrealized depreciation on Level 3 investments still held (29.3) [1] (43.4) [2]
Senior Secured Notes [Member]    
Schedule of Reconciliation of the Fair Value of Investments [Line Items]    
Balance 147.3 [2] 150.7
Net realized (losses)/gains included in earnings (12.6) (14.4)
Net unrealized appreciation/(depreciation) included in earnings 2.1 5.0
Accretion of discounts 1.0 2.9
Purchases 12.9 57.9
Repayments and sales (0.4) (57.9)
Transfers between asset classes (0.1)  
Reductions to CLO Equity cost value [3] [4]
PIK income 0.7 3.2
Transfers in and/or (out) of level 3
Balance 150.8 [1] 147.3 [2]
Net change in unrealized depreciation on Level 3 investments still held (10.1) (11.3)
Equity and Other Investments [Member]    
Schedule of Reconciliation of the Fair Value of Investments [Line Items]    
Balance 9.4 [2] 5.6
Net realized (losses)/gains included in earnings 0.4
Net unrealized appreciation/(depreciation) included in earnings (0.1) (0.2)
Accretion of discounts
Purchases 3.0 4.0
Repayments and sales (0.5)
Transfers between asset classes 0.1  
Reductions to CLO Equity cost value [3] [4]
PIK income 0.1
Transfers in and/or (out) of level 3
Balance 12.4 [1] 9.4 [2]
Net change in unrealized depreciation on Level 3 investments still held (0.1) (0.1)
CLO Equity [Member]    
Schedule of Reconciliation of the Fair Value of Investments [Line Items]    
Balance 95.1 [2] 104.6
Net realized (losses)/gains included in earnings (18.2) (2.8)
Net unrealized appreciation/(depreciation) included in earnings (0.9) (29.1)
Accretion of discounts
Purchases 30.2
Repayments and sales
Transfers between asset classes  
Reductions to CLO Equity cost value (3.9) [3] (7.7) [4]
PIK income
Transfers in and/or (out) of level 3
Balance 72.2 [1] 95.1 [2]
Net change in unrealized depreciation on Level 3 investments still held $ (19.1) $ (32.0)
[1] Totals may not sum due to rounding.
[2] Totals may not sum due to rounding.
[3] Reduction to CLO equity cost value of approximately $3.9 million represented the distributions received, or entitled to be received, on the Company’s investments held in CLO equity subordinated and income notes of approximately $7.1 million, plus the amortization of cost of the Company’s CLO fee notes of approximately $38,000, less the effective yield interest income recognized on the Company’s CLO equity subordinated and income notes of approximately $3.2 million.
[4] Reduction to CLO equity cost value of approximately $7.7 million represented the distributions received, or entitled to be received, on the Company’s investments held in CLO equity subordinated and income notes of approximately $24.1 million, plus the amortization of cost of the Company’s CLO fee notes of approximately $57,000, less the effective yield interest income recognized on the Company’s CLO equity subordinated and income notes of approximately $16.5 million.